| | | | | | | | | | | | | | | | | | | | | |
<?xml version="1.0" encoding="windows-1252"?> |
<!-- Generated by CompSci Transform (tm) - http://www.compsciresources.com --> |
<!-- Created: Wed Oct 14 12:12:57 EDT 2020 --> |
<linkbase xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:xbrldt="http://xbrl.org/2005/xbrldt"> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ConsolidatedBalanceSheet" roleURI="http://www.www.idt.net/role/ConsolidatedBalanceSheet"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ConsolidatedBalanceSheet_Parentheticals" roleURI="http://www.www.idt.net/role/ConsolidatedBalanceSheet_Parentheticals"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ConsolidatedIncomeStatement" roleURI="http://www.www.idt.net/role/ConsolidatedIncomeStatement"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ConsolidatedBalanceSheet0" roleURI="http://www.www.idt.net/role/ConsolidatedBalanceSheet0"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ShareholdersEquityType2or3" roleURI="http://www.www.idt.net/role/ShareholdersEquityType2or3"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ConsolidatedCashFlow" roleURI="http://www.www.idt.net/role/ConsolidatedCashFlow"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_DescriptionofBusinessandSummaryofSignificantAccountingPolicies" roleURI="http://www.www.idt.net/role/DescriptionofBusinessandSummaryofSignificantAccountingPolicies"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_RevenueRecognition" roleURI="http://www.www.idt.net/role/RevenueRecognition"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_Leases" roleURI="http://www.www.idt.net/role/Leases"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_CashCashEquivalentsandRestrictedCashandCashEquivalents" roleURI="http://www.www.idt.net/role/CashCashEquivalentsandRestrictedCashandCashEquivalents"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_Acquisitions" roleURI="http://www.www.idt.net/role/Acquisitions"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_DebtSecurities" roleURI="http://www.www.idt.net/role/DebtSecurities"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_EquityInvestments" roleURI="http://www.www.idt.net/role/EquityInvestments"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_FairValueMeasurements" roleURI="http://www.www.idt.net/role/FairValueMeasurements"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_PropertyPlantandEquipment" roleURI="http://www.www.idt.net/role/PropertyPlantandEquipment"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_Goodwill" roleURI="http://www.www.idt.net/role/Goodwill"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_OtherIntangibleAssets" roleURI="http://www.www.idt.net/role/OtherIntangibleAssets"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_OtherOperatingExpenseNet" roleURI="http://www.www.idt.net/role/OtherOperatingExpenseNet"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_NotePayableandRevolvingCreditLoanPayable" roleURI="http://www.www.idt.net/role/NotePayableandRevolvingCreditLoanPayable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_AccruedExpenses" roleURI="http://www.www.idt.net/role/AccruedExpenses"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_OtherExpenseIncomeNet" roleURI="http://www.www.idt.net/role/OtherExpenseIncomeNet"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_IncomeTaxes" roleURI="http://www.www.idt.net/role/IncomeTaxes"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_Equity" roleURI="http://www.www.idt.net/role/Equity"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_StockBasedCompensation" roleURI="http://www.www.idt.net/role/StockBasedCompensation"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_AccumulatedOtherComprehensiveLoss" roleURI="http://www.www.idt.net/role/AccumulatedOtherComprehensiveLoss"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_CommitmentsandContingencies" roleURI="http://www.www.idt.net/role/CommitmentsandContingencies"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_RelatedPartyTransactions" roleURI="http://www.www.idt.net/role/RelatedPartyTransactions"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_DefinedContributionPlans" roleURI="http://www.www.idt.net/role/DefinedContributionPlans"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_BusinessSegmentInformation" roleURI="http://www.www.idt.net/role/BusinessSegmentInformation"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_AccountingPoliciesByPolicy" roleURI="http://www.www.idt.net/role/AccountingPoliciesByPolicy"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_DescriptionofBusinessandSummaryofSignificantAccountingPoliciesTables" roleURI="http://www.www.idt.net/role/DescriptionofBusinessandSummaryofSignificantAccountingPoliciesTables"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_RevenueRecognitionTables" roleURI="http://www.www.idt.net/role/RevenueRecognitionTables"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_LeasesTables" roleURI="http://www.www.idt.net/role/LeasesTables"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_CashCashEquivalentsandRestrictedCashandCashEquivalentsTables" roleURI="http://www.www.idt.net/role/CashCashEquivalentsandRestrictedCashandCashEquivalentsTables"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_AcquisitionsTables" roleURI="http://www.www.idt.net/role/AcquisitionsTables"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_DebtSecuritiesTables" roleURI="http://www.www.idt.net/role/DebtSecuritiesTables"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_EquityInvestmentsTables" roleURI="http://www.www.idt.net/role/EquityInvestmentsTables"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_FairValueMeasurementsTables" roleURI="http://www.www.idt.net/role/FairValueMeasurementsTables"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_PropertyPlantandEquipmentTables" roleURI="http://www.www.idt.net/role/PropertyPlantandEquipmentTables"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_GoodwillTables" roleURI="http://www.www.idt.net/role/GoodwillTables"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_OtherIntangibleAssetsTables" roleURI="http://www.www.idt.net/role/OtherIntangibleAssetsTables"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_OtherOperatingExpenseNetTables" roleURI="http://www.www.idt.net/role/OtherOperatingExpenseNetTables"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_AccruedExpensesTables" roleURI="http://www.www.idt.net/role/AccruedExpensesTables"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_OtherExpenseIncomeNetTables" roleURI="http://www.www.idt.net/role/OtherExpenseIncomeNetTables"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_IncomeTaxesTables" roleURI="http://www.www.idt.net/role/IncomeTaxesTables"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_StockBasedCompensationTables" roleURI="http://www.www.idt.net/role/StockBasedCompensationTables"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_AccumulatedOtherComprehensiveLossTables" roleURI="http://www.www.idt.net/role/AccumulatedOtherComprehensiveLossTables"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_BusinessSegmentInformationTables" roleURI="http://www.www.idt.net/role/BusinessSegmentInformationTables"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofweightedaveragenumberofsharesusedinthecalculationofbasicanddilutedearningspershareTable" roleURI="http://www.www.idt.net/role/ScheduleofweightedaveragenumberofsharesusedinthecalculationofbasicanddilutedearningspershareTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofoutstandingstockoptionsexcludedfromthecalculationofdilutedearningspershareTable" roleURI="http://www.www.idt.net/role/ScheduleofoutstandingstockoptionsexcludedfromthecalculationofdilutedearningspershareTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofchangeintheallowancefordoubtfulaccountsTable" roleURI="http://www.www.idt.net/role/ScheduleofchangeintheallowancefordoubtfulaccountsTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofrevenuesdisaggregatedbybusinesssegmentandserviceofferedtocustomersTable" roleURI="http://www.www.idt.net/role/ScheduleofrevenuesdisaggregatedbybusinesssegmentandserviceofferedtocustomersTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofrevenuesdisaggregatedbygeographicregionTable" roleURI="http://www.www.idt.net/role/ScheduleofrevenuesdisaggregatedbygeographicregionTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofdeferredcustomercontractacquisitioncostsTable" roleURI="http://www.www.idt.net/role/ScheduleofdeferredcustomercontractacquisitioncostsTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofsupplementaldisclosuresrelatedtotheCompanysoperatingleasesTable" roleURI="http://www.www.idt.net/role/ScheduleofsupplementaldisclosuresrelatedtotheCompanysoperatingleasesTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofsupplementaldisclosuresrelatedweightedaverageoperatingleasesTable" roleURI="http://www.www.idt.net/role/ScheduleofsupplementaldisclosuresrelatedweightedaverageoperatingleasesTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofaggregateoperatingleaseliabilityTable" roleURI="http://www.www.idt.net/role/ScheduleofaggregateoperatingleaseliabilityTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleoffutureminimummaturitiesofoperatingleaseliabilitiesTable" roleURI="http://www.www.idt.net/role/ScheduleoffutureminimummaturitiesofoperatingleaseliabilitiesTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleoffutureminimumpaymentsforoperatingleasesTable" roleURI="http://www.www.idt.net/role/ScheduleoffutureminimumpaymentsforoperatingleasesTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofcashcashequivalentsandrestrictedcashandcashequivalentsTable" roleURI="http://www.www.idt.net/role/ScheduleofcashcashequivalentsandrestrictedcashandcashequivalentsTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofacquisitiondatefairvalueofconsiderationTable" roleURI="http://www.www.idt.net/role/ScheduleofacquisitiondatefairvalueofconsiderationTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofimpactoftheacquisitionspurchasepriceallocationsonconsolidatedbalancesheetTable" roleURI="http://www.www.idt.net/role/ScheduleofimpactoftheacquisitionspurchasepriceallocationsonconsolidatedbalancesheetTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofconsolidatedbalancesheetandacquisitiondatefairvalueoftotalconsiderationtransferredTable" roleURI="http://www.www.idt.net/role/ScheduleofconsolidatedbalancesheetandacquisitiondatefairvalueoftotalconsiderationtransferredTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofavailableforsalesecuritiesTable" roleURI="http://www.www.idt.net/role/ScheduleofavailableforsalesecuritiesTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofcontractualmaturitiesofavailableforsaledebtsecuritiesTable" roleURI="http://www.www.idt.net/role/ScheduleofcontractualmaturitiesofavailableforsaledebtsecuritiesTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofavailableforsalesecuritiesunrealizedlosspositionTable" roleURI="http://www.www.idt.net/role/ScheduleofavailableforsalesecuritiesunrealizedlosspositionTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofequityinvestmentsTable" roleURI="http://www.www.idt.net/role/ScheduleofequityinvestmentsTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofequityinvestmentsTable_Parentheticals" roleURI="http://www.www.idt.net/role/ScheduleofequityinvestmentsTable_Parentheticals"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofcarryingvalueofequityinvestmentsTable" roleURI="http://www.www.idt.net/role/ScheduleofcarryingvalueofequityinvestmentsTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofunrealizedgainsandlossesforallequityinvestmentsTable" roleURI="http://www.www.idt.net/role/ScheduleofunrealizedgainsandlossesforallequityinvestmentsTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofbalanceofassetsmeasuredatfairvalueonarecurringbasisTable" roleURI="http://www.www.idt.net/role/ScheduleofbalanceofassetsmeasuredatfairvalueonarecurringbasisTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofassetsmeasuredatfairvalueonarecurringbasisusingsignificantunobservableinputsLevel3Table" roleURI="http://www.www.idt.net/role/ScheduleofassetsmeasuredatfairvalueonarecurringbasisusingsignificantunobservableinputsLevel3Table"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofliabilitiesmeasuredatfairvalueonarecurringbasisusingsignificantunobservableinputsLevel3Table" roleURI="http://www.www.idt.net/role/ScheduleofliabilitiesmeasuredatfairvalueonarecurringbasisusingsignificantunobservableinputsLevel3Table"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofpropertyplantandequipmentTable" roleURI="http://www.www.idt.net/role/ScheduleofpropertyplantandequipmentTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofchangeincarryingamountofgoodwillbyoperatingsegmentTable" roleURI="http://www.www.idt.net/role/ScheduleofchangeincarryingamountofgoodwillbyoperatingsegmentTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofpresentsinformationontheCompanysamortizedintangibleassetsTable" roleURI="http://www.www.idt.net/role/ScheduleofpresentsinformationontheCompanysamortizedintangibleassetsTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofotheroperatingexpensenetTable" roleURI="http://www.www.idt.net/role/ScheduleofotheroperatingexpensenetTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofaccruedexpensesTable" roleURI="http://www.www.idt.net/role/ScheduleofaccruedexpensesTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofotherexpenseincomenetTable" roleURI="http://www.www.idt.net/role/ScheduleofotherexpenseincomenetTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofincomebeforeincometaxesTable" roleURI="http://www.www.idt.net/role/ScheduleofincomebeforeincometaxesTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofdeferredincometaxassetsTable" roleURI="http://www.www.idt.net/role/ScheduleofdeferredincometaxassetsTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofbenefitfromprovisionforincometaxesTable" roleURI="http://www.www.idt.net/role/ScheduleofbenefitfromprovisionforincometaxesTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofUSfederalstatutoryincometaxrateandincometaxesprovidedTable" roleURI="http://www.www.idt.net/role/ScheduleofUSfederalstatutoryincometaxrateandincometaxesprovidedTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofchangeinthevaluationallowanceTable" roleURI="http://www.www.idt.net/role/ScheduleofchangeinthevaluationallowanceTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofstockoptionactivityTable" roleURI="http://www.www.idt.net/role/ScheduleofstockoptionactivityTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofgrantsofrestrictedsharesofClassBcommonstockTable" roleURI="http://www.www.idt.net/role/ScheduleofgrantsofrestrictedsharesofClassBcommonstockTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofgrantsofrestrictedsharesTable" roleURI="http://www.www.idt.net/role/ScheduleofgrantsofrestrictedsharesTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofaccumulatedbalancesforeachclassificationofothercomprehensivelossTable" roleURI="http://www.www.idt.net/role/ScheduleofaccumulatedbalancesforeachclassificationofothercomprehensivelossTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofoperatingresultsofbusinesssegmentsTable" roleURI="http://www.www.idt.net/role/ScheduleofoperatingresultsofbusinesssegmentsTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_ScheduleofnetlonglivedassetsandtotalassetsbygeographicareasTable" roleURI="http://www.www.idt.net/role/ScheduleofnetlonglivedassetsandtotalassetsbygeographicareasTable"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_DescriptionofBusinessandSummaryofSignificantAccountingPoliciesDetails" roleURI="http://www.www.idt.net/role/DescriptionofBusinessandSummaryofSignificantAccountingPoliciesDetails"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_RevenueRecognitionDetails" roleURI="http://www.www.idt.net/role/RevenueRecognitionDetails"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_LeasesDetails" roleURI="http://www.www.idt.net/role/LeasesDetails"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_CashCashEquivalentsandRestrictedCashandCashEquivalentsDetails" roleURI="http://www.www.idt.net/role/CashCashEquivalentsandRestrictedCashandCashEquivalentsDetails"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_AcquisitionsDetails" roleURI="http://www.www.idt.net/role/AcquisitionsDetails"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_DebtSecuritiesDetails" roleURI="http://www.www.idt.net/role/DebtSecuritiesDetails"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_EquityInvestmentsDetails" roleURI="http://www.www.idt.net/role/EquityInvestmentsDetails"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_FairValueMeasurementsDetails" roleURI="http://www.www.idt.net/role/FairValueMeasurementsDetails"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_PropertyPlantandEquipmentDetails" roleURI="http://www.www.idt.net/role/PropertyPlantandEquipmentDetails"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_OtherIntangibleAssetsDetails" roleURI="http://www.www.idt.net/role/OtherIntangibleAssetsDetails"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_OtherOperatingExpenseNetDetails" roleURI="http://www.www.idt.net/role/OtherOperatingExpenseNetDetails"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_NotePayableandRevolvingCreditLoanPayableDetails" roleURI="http://www.www.idt.net/role/NotePayableandRevolvingCreditLoanPayableDetails"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_IncomeTaxesDetails" roleURI="http://www.www.idt.net/role/IncomeTaxesDetails"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_EquityDetails" roleURI="http://www.www.idt.net/role/EquityDetails"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_StockBasedCompensationDetails" roleURI="http://www.www.idt.net/role/StockBasedCompensationDetails"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_CommitmentsandContingenciesDetails" roleURI="http://www.www.idt.net/role/CommitmentsandContingenciesDetails"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_RelatedPartyTransactionsDetails" roleURI="http://www.www.idt.net/role/RelatedPartyTransactionsDetails"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_DefinedContributionPlansDetails" roleURI="http://www.www.idt.net/role/DefinedContributionPlansDetails"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#idt_r_BusinessSegmentInformationDetails" roleURI="http://www.www.idt.net/role/BusinessSegmentInformationDetails"/> |
| <roleRef xlink:type="simple" xlink:href="idt-20200731.xsd#DocumentAndEntityInformation" roleURI="http://www.www.idt.net/role/DocumentAndEntityInformation"/> |
| <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default"/> |
| <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain"/> |
| <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension"/> |
| <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member"/> |
| <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" arcroleURI="http://xbrl.org/int/dim/arcrole/all"/> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ConsolidatedBalanceSheet"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementLineItems" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementTable" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementClassOfStockAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementClassOfStockAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_StatementClassOfStockAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CommonClassAMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonClassAMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="us-gaap_CommonClassAMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CommonClassBMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonClassBMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="us-gaap_CommonClassBMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AssetsAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_AssetsAbstract" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AssetsCurrentAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsCurrentAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_AssetsCurrentAbstract" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DebtSecuritiesCurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtSecuritiesCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="us-gaap_DebtSecuritiesCurrent" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_EquityInvestmentsCurrent" xlink:href="idt-20200731.xsd#idt_EquityInvestmentsCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="idt_EquityInvestmentsCurrent" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ReceivablesNetCurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReceivablesNetCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="us-gaap_ReceivablesNetCurrent" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PrepaidExpenseCurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PrepaidExpenseCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="us-gaap_PrepaidExpenseCurrent" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherAssetsCurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="us-gaap_OtherAssetsCurrent" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AssetsCurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsCurrentAbstract" xlink:to="us-gaap_AssetsCurrent" order="7" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PropertyPlantAndEquipmentNet" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_PropertyPlantAndEquipmentNet" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_Goodwill" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_Goodwill" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherIntangibleAssetsNet" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherIntangibleAssetsNet"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_OtherIntangibleAssetsNet" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LongTermInvestments" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermInvestments"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_LongTermInvestments" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_OperatingLeaseRightOfUseAsset" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DeferredIncomeTaxAssetsNet" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_DeferredIncomeTaxAssetsNet" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherAssetsNoncurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsNoncurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_OtherAssetsNoncurrent" order="7" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_Assets" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Assets"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_Assets" order="8" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_LiabilitiesAndStockholdersEquityAbstract" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LiabilitiesCurrentAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:to="us-gaap_LiabilitiesCurrentAbstract" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AccountsPayableCurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsPayableCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="us-gaap_AccountsPayableCurrent" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AccruedLiabilitiesCurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="us-gaap_AccruedLiabilitiesCurrent" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DeferredRevenueCurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredRevenueCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="us-gaap_DeferredRevenueCurrent" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DepositLiabilityCurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DepositLiabilityCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="us-gaap_DepositLiabilityCurrent" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherLiabilitiesCurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherLiabilitiesCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="us-gaap_OtherLiabilitiesCurrent" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LiabilitiesCurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesCurrentAbstract" xlink:to="us-gaap_LiabilitiesCurrent" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:to="us-gaap_OperatingLeaseLiabilityNoncurrent" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherLiabilitiesNoncurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:to="us-gaap_OtherLiabilitiesNoncurrent" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_Liabilities" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Liabilities"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:to="us-gaap_Liabilities" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CommitmentsAndContingencies" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommitmentsAndContingencies"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:to="us-gaap_CommitmentsAndContingencies" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EquityAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:to="us-gaap_EquityAbstract" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StockholdersEquityAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityAbstract" xlink:to="us-gaap_StockholdersEquityAbstract" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PreferredStockValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StockholdersEquityAbstract" xlink:to="us-gaap_PreferredStockValue" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CommonStockValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StockholdersEquityAbstract" xlink:to="us-gaap_CommonStockValue" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AdditionalPaidInCapital" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdditionalPaidInCapital"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityAbstract" xlink:to="us-gaap_AdditionalPaidInCapital" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_TreasuryStockValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TreasuryStockValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityAbstract" xlink:to="us-gaap_TreasuryStockValue" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityAbstract" xlink:to="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RetainedEarningsAccumulatedDeficit" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityAbstract" xlink:to="us-gaap_RetainedEarningsAccumulatedDeficit" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StockholdersEquity" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityAbstract" xlink:to="us-gaap_StockholdersEquity" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_MinorityInterest" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MinorityInterest"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:to="us-gaap_MinorityInterest" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:to="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" order="7" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_LiabilitiesAndStockholdersEquity" order="3" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ConsolidatedBalanceSheet_Parentheticals"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementLineItems" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementTable" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementClassOfStockAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementClassOfStockAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_StatementClassOfStockAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CommonClassAMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonClassAMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="us-gaap_CommonClassAMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CommonClassBMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonClassBMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="us-gaap_CommonClassBMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PreferredStockParOrStatedValuePerShare" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_PreferredStockParOrStatedValuePerShare" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PreferredStockSharesAuthorized" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockSharesAuthorized"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_PreferredStockSharesAuthorized" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PreferredStockSharesIssued" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockSharesIssued"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_PreferredStockSharesIssued" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CommonStockParOrStatedValuePerShare" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_CommonStockParOrStatedValuePerShare" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CommonStockSharesAuthorized" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockSharesAuthorized"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_CommonStockSharesAuthorized" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CommonStockSharesIssued" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockSharesIssued"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_CommonStockSharesIssued" order="7" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CommonStockSharesOutstanding" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockSharesOutstanding"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_CommonStockSharesOutstanding" order="8" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_TreasuryStockShares" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TreasuryStockShares"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_TreasuryStockShares" order="9" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ConsolidatedIncomeStatement"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncomeStatementAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_Revenues" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Revenues"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeStatementAbstract" xlink:to="us-gaap_Revenues" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingExpensesAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingExpensesAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeStatementAbstract" xlink:to="us-gaap_OperatingExpensesAbstract" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingCostsAndExpenses" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingCostsAndExpenses"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_OperatingCostsAndExpenses" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SellingGeneralAndAdministrativeExpense" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_SellingGeneralAndAdministrativeExpense" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DepreciationAndAmortization" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DepreciationAndAmortization"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_DepreciationAndAmortization" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SeveranceCosts1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SeveranceCosts1"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpensesAbstract" xlink:to="us-gaap_SeveranceCosts1" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingExpenses" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingExpenses"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeStatementAbstract" xlink:to="us-gaap_OperatingExpenses" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherOperatingIncomeExpenseNet" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherOperatingIncomeExpenseNet"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpenses" xlink:to="us-gaap_OtherOperatingIncomeExpenseNet" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingIncomeLoss" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingIncomeLoss"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpenses" xlink:to="us-gaap_OperatingIncomeLoss" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_InterestIncomeExpenseNet" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestIncomeExpenseNet"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingIncomeLoss" xlink:to="us-gaap_InterestIncomeExpenseNet" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_NonoperatingIncomeExpense" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NonoperatingIncomeExpense"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingIncomeLoss" xlink:to="us-gaap_NonoperatingIncomeExpense" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingExpenses" xlink:to="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncomeTaxExpenseBenefit" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:to="us-gaap_IncomeTaxExpenseBenefit" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ProfitLoss" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeStatementAbstract" xlink:to="us-gaap_ProfitLoss" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ProfitLoss" xlink:to="us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_NetIncomeLoss" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeStatementAbstract" xlink:to="us-gaap_NetIncomeLoss" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EarningsPerShareBasicAndDilutedAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EarningsPerShareBasicAndDilutedAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetIncomeLoss" xlink:to="us-gaap_EarningsPerShareBasicAndDilutedAbstract" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EarningsPerShareBasic" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EarningsPerShareBasic"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EarningsPerShareBasicAndDilutedAbstract" xlink:to="us-gaap_EarningsPerShareBasic" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EarningsPerShareDiluted" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EarningsPerShareDiluted"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EarningsPerShareBasicAndDilutedAbstract" xlink:to="us-gaap_EarningsPerShareDiluted" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EarningsPerShareBasicAndDilutedAbstract" xlink:to="us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract" xlink:to="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract" xlink:to="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensation" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensation"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetIncomeLoss" xlink:to="us-gaap_ShareBasedCompensation" order="1" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ConsolidatedBalanceSheet0"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementOfFinancialPositionAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ProfitLoss" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfFinancialPositionAbstract" xlink:to="us-gaap_ProfitLoss" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfFinancialPositionAbstract" xlink:to="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract" xlink:to="us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:to="us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfFinancialPositionAbstract" xlink:to="us-gaap_OtherComprehensiveIncomeLossNetOfTax" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfFinancialPositionAbstract" xlink:to="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:to="us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ComprehensiveIncomeNetOfTax" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfFinancialPositionAbstract" xlink:to="us-gaap_ComprehensiveIncomeNetOfTax" order="4" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ShareholdersEquityType2or3"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementLineItems" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementTable" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StatementTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementEquityComponentsAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_StatementTable" xlink:to="us-gaap_StatementEquityComponentsAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EquityComponentDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EquityComponentDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_ClassOneCommonStockMember" xlink:href="idt-20200731.xsd#idt_ClassOneCommonStockMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="idt_ClassOneCommonStockMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_ClassTwoCommonStockMember" xlink:href="idt-20200731.xsd#idt_ClassTwoCommonStockMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="idt_ClassTwoCommonStockMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AdditionalPaidInCapitalMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_AdditionalPaidInCapitalMember" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_TreasuryStockMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TreasuryStockMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_TreasuryStockMember" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_AccumulatedOtherComprehensiveIncomeMember" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RetainedEarningsMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_RetainedEarningsMember" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_NoncontrollingInterestMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoncontrollingInterestMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_NoncontrollingInterestMember" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SharesIssued" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharesIssued"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_SharesIssued" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_AdjustmentsFromChangeInRevenueRecognition" xlink:href="idt-20200731.xsd#idt_AdjustmentsFromChangeInRevenueRecognition"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="idt_AdjustmentsFromChangeInRevenueRecognition" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_CumulativeEffectOnRetainedEarningsNetOfTax" xlink:href="idt-20200731.xsd#idt_CumulativeEffectOnRetainedEarningsNetOfTax"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="idt_CumulativeEffectOnRetainedEarningsNetOfTax" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestsAdjustedBalance1" xlink:href="idt-20200731.xsd#idt_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestsAdjustedBalance1"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="idt_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestsAdjustedBalance1" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedShareBalance1" xlink:href="idt-20200731.xsd#idt_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedShareBalance1"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="idt_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedShareBalance1" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_NoncontrollingInterestIncreaseDecreaseFromCorrection" xlink:href="idt-20200731.xsd#idt_NoncontrollingInterestIncreaseDecreaseFromCorrection"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="idt_NoncontrollingInterestIncreaseDecreaseFromCorrection" order="7" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercisedNetOfTaxBenefitExpense" order="8" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" order="9" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_RepurchasesOfClassBCommonStockThroughRepurchaseProgram" xlink:href="idt-20200731.xsd#idt_RepurchasesOfClassBCommonStockThroughRepurchaseProgram"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="idt_RepurchasesOfClassBCommonStockThroughRepurchaseProgram" order="10" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ProceedsFromIssuanceOrSaleOfEquity" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromIssuanceOrSaleOfEquity"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_ProceedsFromIssuanceOrSaleOfEquity" order="11" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_RepurchaseOfRestrictedStock" xlink:href="idt-20200731.xsd#idt_RepurchaseOfRestrictedStock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="idt_RepurchaseOfRestrictedStock" order="12" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_StockBasedCompensation" xlink:href="idt-20200731.xsd#idt_StockBasedCompensation"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="idt_StockBasedCompensation" order="13" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" order="14" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_DistributionToNoncontrollingInterests" xlink:href="idt-20200731.xsd#idt_DistributionToNoncontrollingInterests"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="idt_DistributionToNoncontrollingInterests" order="15" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_OtherComprehensiveIncomeLossNetOfTax" order="16" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ProfitLoss" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementLineItems" xlink:to="us-gaap_ProfitLoss" order="17" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ConsolidatedCashFlow"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementOfCashFlowsAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ProfitLoss" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_ProfitLoss" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DepreciationAndAmortization" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DepreciationAndAmortization"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_DepreciationAndAmortization" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DeferredIncomeTaxesAndTaxCredits" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxesAndTaxCredits"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_DeferredIncomeTaxesAndTaxCredits" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ProvisionForDoubtfulAccounts" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_ProvisionForDoubtfulAccounts" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensation" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensation"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_ShareBasedCompensation" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherNoncashIncomeExpense" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNoncashIncomeExpense"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_OtherNoncashIncomeExpense" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="us-gaap_IncreaseDecreaseInAccountsReceivable" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncreaseDecreaseInOtherCurrentLiabilities" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInOtherCurrentLiabilities"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="us-gaap_IncreaseDecreaseInOtherCurrentLiabilities" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerLiability" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerLiability"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="us-gaap_IncreaseDecreaseInContractWithCustomerLiability" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInOperatingActivities" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PaymentsToAcquireMarketableSecurities" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireMarketableSecurities"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="us-gaap_PaymentsToAcquireMarketableSecurities" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivities" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PaymentsOfCapitalDistribution" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsOfCapitalDistribution"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_PaymentsOfCapitalDistribution" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RepaymentsOfOtherDebt" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RepaymentsOfOtherDebt"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_RepaymentsOfOtherDebt" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_ProceedsFromIssuanceOfCommonStock" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ProceedsFromNotesPayable" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromNotesPayable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_ProceedsFromNotesPayable" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RepaymentsOfNotesPayable" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RepaymentsOfNotesPayable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_RepaymentsOfNotesPayable" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ProceedsFromStockOptionsExercised" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromStockOptionsExercised"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_ProceedsFromStockOptionsExercised" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ProceedsFromLinesOfCredit" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromLinesOfCredit"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_ProceedsFromLinesOfCredit" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RepaymentsOfLinesOfCredit" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RepaymentsOfLinesOfCredit"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_RepaymentsOfLinesOfCredit" order="7" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_PaymentsForRepurchaseOfCommonStock" order="8" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInFinancingActivities" order="9" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SupplementalCashFlowInformationAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SupplementalCashFlowInformationAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="us-gaap_SupplementalCashFlowInformationAbstract" order="7" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_InterestPaidNet" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestPaidNet"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SupplementalCashFlowInformationAbstract" xlink:to="us-gaap_InterestPaidNet" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncomeTaxesPaid" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxesPaid"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SupplementalCashFlowInformationAbstract" xlink:to="us-gaap_IncomeTaxesPaid" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StatementOfCashFlowsAbstract" xlink:to="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" order="8" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xlink:to="us-gaap_NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationGiven1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationGiven1"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xlink:to="us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationGiven1" order="1" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/DescriptionofBusinessandSummaryofSignificantAccountingPolicies"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AccountingPoliciesAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountingPoliciesAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SignificantAccountingPoliciesTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_SignificantAccountingPoliciesTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/RevenueRecognition"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RevenueFromContractWithCustomerAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RevenueFromContractWithCustomerTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RevenueFromContractWithCustomerAbstract" xlink:to="us-gaap_RevenueFromContractWithCustomerTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/Leases"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DisclosureTextBlockAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisclosureTextBlockAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LesseeOperatingLeasesTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeasesTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DisclosureTextBlockAbstract" xlink:to="us-gaap_LesseeOperatingLeasesTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/CashCashEquivalentsandRestrictedCashandCashEquivalents"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CashAndCashEquivalentsAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CashAndCashEquivalentsDisclosureTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsDisclosureTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CashAndCashEquivalentsAbstract" xlink:to="us-gaap_CashAndCashEquivalentsDisclosureTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/Acquisitions"> |
| | <loc xlink:type="locator" xlink:label="idt_AcquistionsAbstract" xlink:href="idt-20200731.xsd#idt_AcquistionsAbstract"/> |
| | <loc xlink:type="locator" xlink:label="idt_Acquistions" xlink:href="idt-20200731.xsd#idt_Acquistions"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_AcquistionsAbstract" xlink:to="idt_Acquistions" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/DebtSecurities"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract" xlink:to="us-gaap_InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/EquityInvestments"> |
| | <loc xlink:type="locator" xlink:label="idt_EquityInvestmentsDisclosureAbstract" xlink:href="idt-20200731.xsd#idt_EquityInvestmentsDisclosureAbstract"/> |
| | <loc xlink:type="locator" xlink:label="idt_EquityInvestmentsDisclosureTextBlock" xlink:href="idt-20200731.xsd#idt_EquityInvestmentsDisclosureTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_EquityInvestmentsDisclosureAbstract" xlink:to="idt_EquityInvestmentsDisclosureTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/FairValueMeasurements"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FairValueDisclosuresAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueDisclosuresAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FairValueDisclosuresTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueDisclosuresTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueDisclosuresAbstract" xlink:to="us-gaap_FairValueDisclosuresTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/PropertyPlantandEquipment"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PropertyPlantAndEquipmentAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentAbstract" xlink:to="us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/Goodwill"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DisclosureTextBlockSupplementAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisclosureTextBlockSupplementAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_GoodwillDisclosureTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillDisclosureTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DisclosureTextBlockSupplementAbstract" xlink:to="us-gaap_GoodwillDisclosureTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/OtherIntangibleAssets"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:to="us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/OtherOperatingExpenseNet"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherIncomeAndExpensesAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherIncomeAndExpensesAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherOperatingIncomeAndExpenseTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherOperatingIncomeAndExpenseTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherIncomeAndExpensesAbstract" xlink:to="us-gaap_OtherOperatingIncomeAndExpenseTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/NotePayableandRevolvingCreditLoanPayable"> |
| | <loc xlink:type="locator" xlink:label="idt_NotePayableAndRevolvingCreditFacilityAbstract" xlink:href="idt-20200731.xsd#idt_NotePayableAndRevolvingCreditFacilityAbstract"/> |
| | <loc xlink:type="locator" xlink:label="idt_NotePayableAndRevolvingCreditFacility" xlink:href="idt-20200731.xsd#idt_NotePayableAndRevolvingCreditFacility"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_NotePayableAndRevolvingCreditFacilityAbstract" xlink:to="idt_NotePayableAndRevolvingCreditFacility" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/AccruedExpenses"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PayablesAndAccrualsAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PayablesAndAccrualsAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PayablesAndAccrualsAbstract" xlink:to="us-gaap_AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/OtherExpenseIncomeNet"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherIncomeAndExpensesAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherIncomeAndExpensesAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherIncomeAndOtherExpenseDisclosureTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherIncomeAndOtherExpenseDisclosureTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherIncomeAndExpensesAbstract" xlink:to="us-gaap_OtherIncomeAndOtherExpenseDisclosureTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/IncomeTaxes"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncomeTaxDisclosureAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncomeTaxDisclosureTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxDisclosureTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeTaxDisclosureAbstract" xlink:to="us-gaap_IncomeTaxDisclosureTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/Equity"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StockholdersEquityNoteAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityNoteAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityNoteDisclosureTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StockholdersEquityNoteAbstract" xlink:to="us-gaap_StockholdersEquityNoteDisclosureTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/StockBasedCompensation"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:to="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/AccumulatedOtherComprehensiveLoss"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StockholdersEquityNoteAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityNoteAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ComprehensiveIncomeNoteTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComprehensiveIncomeNoteTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StockholdersEquityNoteAbstract" xlink:to="us-gaap_ComprehensiveIncomeNoteTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/CommitmentsandContingencies"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:to="us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/RelatedPartyTransactions"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionsAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RelatedPartyTransactionsAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionsDisclosureTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RelatedPartyTransactionsDisclosureTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionsAbstract" xlink:to="us-gaap_RelatedPartyTransactionsDisclosureTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/DefinedContributionPlans"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DisclosureTextBlockSupplementAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisclosureTextBlockSupplementAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CompensationAndEmployeeBenefitPlansOtherThanShareBasedCompensationTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CompensationAndEmployeeBenefitPlansOtherThanShareBasedCompensationTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DisclosureTextBlockSupplementAbstract" xlink:to="us-gaap_CompensationAndEmployeeBenefitPlansOtherThanShareBasedCompensationTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/BusinessSegmentInformation"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SegmentReportingAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentReportingAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SegmentReportingDisclosureTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentReportingDisclosureTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingAbstract" xlink:to="us-gaap_SegmentReportingDisclosureTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/AccountingPoliciesByPolicy"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AccountingPoliciesAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountingPoliciesAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ConsolidationPolicyTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConsolidationPolicyTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_ConsolidationPolicyTextBlock" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_UseOfEstimates" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UseOfEstimates"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_UseOfEstimates" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RevenueRecognitionPolicyTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueRecognitionPolicyTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_RevenueRecognitionPolicyTextBlock" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CostOfSalesPolicyTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CostOfSalesPolicyTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_CostOfSalesPolicyTextBlock" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CashAndCashEquivalentsPolicyTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsPolicyTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_CashAndCashEquivalentsPolicyTextBlock" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_SubstantiallyRestrictedCashAndCashEquivalentsPolicyTextBlock" xlink:href="idt-20200731.xsd#idt_SubstantiallyRestrictedCashAndCashEquivalentsPolicyTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="idt_SubstantiallyRestrictedCashAndCashEquivalentsPolicyTextBlock" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_MarketableSecuritiesPolicy" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MarketableSecuritiesPolicy"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_MarketableSecuritiesPolicy" order="7" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_EquityInvestmentsPolicyTextBlock" xlink:href="idt-20200731.xsd#idt_EquityInvestmentsPolicyTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="idt_EquityInvestmentsPolicyTextBlock" order="8" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PropertyPlantAndEquipmentPolicyTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentPolicyTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_PropertyPlantAndEquipmentPolicyTextBlock" order="9" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy" order="10" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AdvertisingCostsPolicyTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdvertisingCostsPolicyTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_AdvertisingCostsPolicyTextBlock" order="11" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_InternalUseSoftwarePolicy" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InternalUseSoftwarePolicy"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_InternalUseSoftwarePolicy" order="12" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_MaintenanceCostPolicyPolicyTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MaintenanceCostPolicyPolicyTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_MaintenanceCostPolicyPolicyTextBlock" order="13" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock" order="14" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncomeTaxPolicyTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxPolicyTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_IncomeTaxPolicyTextBlock" order="15" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CommitmentsAndContingenciesPolicyTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommitmentsAndContingenciesPolicyTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_CommitmentsAndContingenciesPolicyTextBlock" order="16" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EarningsPerSharePolicyTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EarningsPerSharePolicyTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_EarningsPerSharePolicyTextBlock" order="17" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy" order="18" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ConcentrationRiskCreditRisk" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConcentrationRiskCreditRisk"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_ConcentrationRiskCreditRisk" order="19" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ReceivablesTradeAndOtherAccountsReceivableAllowanceForDoubtfulAccountsPolicy" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReceivablesTradeAndOtherAccountsReceivableAllowanceForDoubtfulAccountsPolicy"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_ReceivablesTradeAndOtherAccountsReceivableAllowanceForDoubtfulAccountsPolicy" order="20" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FairValueMeasurementPolicyPolicyTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementPolicyPolicyTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_FairValueMeasurementPolicyPolicyTextBlock" order="21" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_LeasesNewAccountingPronouncementsPolicyPolicyTextBlock" xlink:href="idt-20200731.xsd#idt_LeasesNewAccountingPronouncementsPolicyPolicyTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="idt_LeasesNewAccountingPronouncementsPolicyPolicyTextBlock" order="22" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" order="23" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/DescriptionofBusinessandSummaryofSignificantAccountingPoliciesTables"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AccountingPoliciesAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountingPoliciesAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTextBlock" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfChangesInAllowanceForDoubtfulAccountsTableTextBlock" xlink:href="idt-20200731.xsd#idt_ScheduleOfChangesInAllowanceForDoubtfulAccountsTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccountingPoliciesAbstract" xlink:to="idt_ScheduleOfChangesInAllowanceForDoubtfulAccountsTableTextBlock" order="2" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/RevenueRecognitionTables"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RevenueFromContractWithCustomerAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RevenueFromContractWithCustomerAbstract" xlink:to="us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RevenueFromExternalCustomersByGeographicAreasTableTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromExternalCustomersByGeographicAreasTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RevenueFromContractWithCustomerAbstract" xlink:to="us-gaap_RevenueFromExternalCustomersByGeographicAreasTableTextBlock" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CapitalizedContractCostTableTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalizedContractCostTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RevenueFromContractWithCustomerAbstract" xlink:to="us-gaap_CapitalizedContractCostTableTextBlock" order="2" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/LeasesTables"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DisclosureTextBlockAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisclosureTextBlockAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LeaseCostTableTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseCostTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DisclosureTextBlockAbstract" xlink:to="us-gaap_LeaseCostTableTextBlock" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfWeightedAverageNumberOfSharesTableTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfWeightedAverageNumberOfSharesTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DisclosureTextBlockAbstract" xlink:to="us-gaap_ScheduleOfWeightedAverageNumberOfSharesTableTextBlock" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingLeasesOfLesseeDisclosureTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesOfLesseeDisclosureTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DisclosureTextBlockAbstract" xlink:to="us-gaap_OperatingLeasesOfLesseeDisclosureTextBlock" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DisclosureTextBlockAbstract" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DisclosureTextBlockAbstract" xlink:to="us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock" order="4" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/CashCashEquivalentsandRestrictedCashandCashEquivalentsTables"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CashAndCashEquivalentsAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfCashAndCashEquivalentsTableTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfCashAndCashEquivalentsTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CashAndCashEquivalentsAbstract" xlink:to="us-gaap_ScheduleOfCashAndCashEquivalentsTableTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/AcquisitionsTables"> |
| | <loc xlink:type="locator" xlink:label="idt_AcquistionsAbstract" xlink:href="idt-20200731.xsd#idt_AcquistionsAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_AcquistionsAbstract" xlink:to="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTextBlock" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_AcquistionsAbstract" xlink:to="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTextBlock" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfBusinessAcquisitionsByBalanceSheetTableTextBlock" xlink:href="idt-20200731.xsd#idt_ScheduleOfBusinessAcquisitionsByBalanceSheetTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_AcquistionsAbstract" xlink:to="idt_ScheduleOfBusinessAcquisitionsByBalanceSheetTableTextBlock" order="2" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/DebtSecuritiesTables"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_MarketableSecuritiesTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MarketableSecuritiesTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract" xlink:to="us-gaap_MarketableSecuritiesTextBlock" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AvailableForSaleSecuritiesTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract" xlink:to="us-gaap_AvailableForSaleSecuritiesTextBlock" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueTableTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract" xlink:to="us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueTableTextBlock" order="2" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/EquityInvestmentsTables"> |
| | <loc xlink:type="locator" xlink:label="idt_EquityInvestmentsDisclosureAbstract" xlink:href="idt-20200731.xsd#idt_EquityInvestmentsDisclosureAbstract"/> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfEquityInvestmentsTableTextBlock" xlink:href="idt-20200731.xsd#idt_ScheduleOfEquityInvestmentsTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_EquityInvestmentsDisclosureAbstract" xlink:to="idt_ScheduleOfEquityInvestmentsTableTextBlock" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_TradingSecuritiesAndCertainTradingAssetsTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TradingSecuritiesAndCertainTradingAssetsTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_EquityInvestmentsDisclosureAbstract" xlink:to="us-gaap_TradingSecuritiesAndCertainTradingAssetsTextBlock" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_UnrealizedGainLossOnInvestmentsTableTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnrealizedGainLossOnInvestmentsTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_EquityInvestmentsDisclosureAbstract" xlink:to="us-gaap_UnrealizedGainLossOnInvestmentsTableTextBlock" order="2" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/FairValueMeasurementsTables"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FairValueDisclosuresAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueDisclosuresAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueDisclosuresAbstract" xlink:to="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueDisclosuresAbstract" xlink:to="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfLiabilitiesMeasuredAtFairValueOnARecurringBasisUsingSignificantUnobservableInputsTableTextBlock" xlink:href="idt-20200731.xsd#idt_ScheduleOfLiabilitiesMeasuredAtFairValueOnARecurringBasisUsingSignificantUnobservableInputsTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueDisclosuresAbstract" xlink:to="idt_ScheduleOfLiabilitiesMeasuredAtFairValueOnARecurringBasisUsingSignificantUnobservableInputsTableTextBlock" order="2" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/PropertyPlantandEquipmentTables"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PropertyPlantAndEquipmentAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PropertyPlantAndEquipmentTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentAbstract" xlink:to="us-gaap_PropertyPlantAndEquipmentTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/GoodwillTables"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DisclosureTextBlockSupplementAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisclosureTextBlockSupplementAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DisclosureTextBlockSupplementAbstract" xlink:to="us-gaap_ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/OtherIntangibleAssetsTables"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:to="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/OtherOperatingExpenseNetTables"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherIncomeAndExpensesAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherIncomeAndExpensesAbstract"/> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfOtherOperatingExpensesGainsNetTableTextBlock" xlink:href="idt-20200731.xsd#idt_ScheduleOfOtherOperatingExpensesGainsNetTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherIncomeAndExpensesAbstract" xlink:to="idt_ScheduleOfOtherOperatingExpensesGainsNetTableTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/AccruedExpensesTables"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PayablesAndAccrualsAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PayablesAndAccrualsAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PayablesAndAccrualsAbstract" xlink:to="us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/OtherExpenseIncomeNetTables"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherIncomeAndExpensesAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherIncomeAndExpensesAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfOtherNonoperatingIncomeExpenseTableTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfOtherNonoperatingIncomeExpenseTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherIncomeAndExpensesAbstract" xlink:to="us-gaap_ScheduleOfOtherNonoperatingIncomeExpenseTableTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/IncomeTaxesTables"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncomeTaxDisclosureAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfIncomeBeforeIncomeTaxDomesticAndForeignTableTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfIncomeBeforeIncomeTaxDomesticAndForeignTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeTaxDisclosureAbstract" xlink:to="us-gaap_ScheduleOfIncomeBeforeIncomeTaxDomesticAndForeignTableTextBlock" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeTaxDisclosureAbstract" xlink:to="us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeTaxDisclosureAbstract" xlink:to="us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeTaxDisclosureAbstract" xlink:to="us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SummaryOfValuationAllowanceTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SummaryOfValuationAllowanceTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IncomeTaxDisclosureAbstract" xlink:to="us-gaap_SummaryOfValuationAllowanceTextBlock" order="4" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/StockBasedCompensationTables"> |
| | <loc xlink:type="locator" xlink:label="idt_StockBasedCompensationTablesLineItems" xlink:href="idt-20200731.xsd#idt_StockBasedCompensationTablesLineItems"/> |
| | <loc xlink:type="locator" xlink:label="idt_StockBasedCompensationTablesTable" xlink:href="idt-20200731.xsd#idt_StockBasedCompensationTablesTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="idt_StockBasedCompensationTablesLineItems" xlink:to="idt_StockBasedCompensationTablesTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementClassOfStockAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementClassOfStockAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_StockBasedCompensationTablesTable" xlink:to="us-gaap_StatementClassOfStockAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CommonClassBMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonClassBMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="us-gaap_CommonClassBMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_StockBasedCompensationTablesLineItems" xlink:to="us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_StockBasedCompensationTablesLineItems" xlink:to="us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock" order="2" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/AccumulatedOtherComprehensiveLossTables"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StockholdersEquityNoteAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityNoteAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_StockholdersEquityNoteAbstract" xlink:to="us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/BusinessSegmentInformationTables"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SegmentReportingAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentReportingAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingAbstract" xlink:to="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LongLivedAssetsByGeographicAreasTableTextBlock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongLivedAssetsByGeographicAreasTableTextBlock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingAbstract" xlink:to="us-gaap_LongLivedAssetsByGeographicAreasTableTextBlock" order="1" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofweightedaveragenumberofsharesusedinthecalculationofbasicanddilutedearningspershareTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfWeightedAverageNumberOfSharesUsedInTheCalculationOfBasicAndDilutedEarningsPerShareAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfWeightedAverageNumberOfSharesUsedInTheCalculationOfBasicAndDilutedEarningsPerShareAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfWeightedAverageNumberOfSharesUsedInTheCalculationOfBasicAndDilutedEarningsPerShareAbstract" xlink:to="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfWeightedAverageNumberOfSharesUsedInTheCalculationOfBasicAndDilutedEarningsPerShareAbstract" xlink:to="us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract" xlink:to="us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract" xlink:to="us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfWeightedAverageNumberOfSharesUsedInTheCalculationOfBasicAndDilutedEarningsPerShareAbstract" xlink:to="us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" order="2" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofoutstandingstockoptionsexcludedfromthecalculationofdilutedearningspershareTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfOutstandingStockOptionsExcludedFromTheCalculationOfDilutedEarningsPerShareAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfOutstandingStockOptionsExcludedFromTheCalculationOfDilutedEarningsPerShareAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfOutstandingStockOptionsExcludedFromTheCalculationOfDilutedEarningsPerShareAbstract" xlink:to="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofchangeintheallowancefordoubtfulaccountsTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfChangeInTheAllowanceForDoubtfulAccountsAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfChangeInTheAllowanceForDoubtfulAccountsAbstract"/> |
| | <loc xlink:type="locator" xlink:label="idt_ReservesDeductedFromAccountsReceivableAbstract" xlink:href="idt-20200731.xsd#idt_ReservesDeductedFromAccountsReceivableAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfChangeInTheAllowanceForDoubtfulAccountsAbstract" xlink:to="idt_ReservesDeductedFromAccountsReceivableAbstract" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AccountsReceivableGrossCurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsReceivableGrossCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ReservesDeductedFromAccountsReceivableAbstract" xlink:to="us-gaap_AccountsReceivableGrossCurrent" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ProvisionForDoubtfulAccounts" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ReservesDeductedFromAccountsReceivableAbstract" xlink:to="us-gaap_ProvisionForDoubtfulAccounts" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ReservesDeductedFromAccountsReceivableAbstract" xlink:to="us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs" order="2" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofrevenuesdisaggregatedbybusinesssegmentandserviceofferedtocustomersTable"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems" xlink:to="us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_ProductOrServiceAxis" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductOrServiceAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable" xlink:to="srt_ProductOrServiceAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_ProductsAndServicesDomain" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductsAndServicesDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_ProductOrServiceAxis" xlink:to="srt_ProductsAndServicesDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_ProductsAndServicesDomain_0" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductsAndServicesDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_ProductOrServiceAxis" xlink:to="srt_ProductsAndServicesDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementBusinessSegmentsAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable" xlink:to="us-gaap_StatementBusinessSegmentsAxis" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SegmentDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementBusinessSegmentsAxis" xlink:to="us-gaap_SegmentDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SegmentDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementBusinessSegmentsAxis" xlink:to="us-gaap_SegmentDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_TelecomAndPaymentServiceMember" xlink:href="idt-20200731.xsd#idt_TelecomAndPaymentServiceMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentDomain" xlink:to="idt_TelecomAndPaymentServiceMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_Net2PhoneMember" xlink:href="idt-20200731.xsd#idt_Net2PhoneMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentDomain" xlink:to="idt_Net2PhoneMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_BOSSRevolutionMoneyTransferMember" xlink:href="idt-20200731.xsd#idt_BOSSRevolutionMoneyTransferMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="idt_BOSSRevolutionMoneyTransferMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_NationalRetailSolutionsMember" xlink:href="idt-20200731.xsd#idt_NationalRetailSolutionsMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="idt_NationalRetailSolutionsMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_TotalTelecomAndPaymentServicesOtherMember" xlink:href="idt-20200731.xsd#idt_TotalTelecomAndPaymentServicesOtherMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="idt_TotalTelecomAndPaymentServicesOtherMember" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_MobileTopUpMember" xlink:href="idt-20200731.xsd#idt_MobileTopUpMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="idt_MobileTopUpMember" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_BossRevolutionCallingMember" xlink:href="idt-20200731.xsd#idt_BossRevolutionCallingMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="idt_BossRevolutionCallingMember" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_WholesaleCarrierServicesMember" xlink:href="idt-20200731.xsd#idt_WholesaleCarrierServicesMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="idt_WholesaleCarrierServicesMember" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_TotalTelecomAndPaymentServicesOthersMember" xlink:href="idt-20200731.xsd#idt_TotalTelecomAndPaymentServicesOthersMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="idt_TotalTelecomAndPaymentServicesOthersMember" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_NetTwoPhoneUnifiedCommunicationsAsServiceMember" xlink:href="idt-20200731.xsd#idt_NetTwoPhoneUnifiedCommunicationsAsServiceMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="idt_NetTwoPhoneUnifiedCommunicationsAsServiceMember" order="7" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_Net2PhonePlatformServicesMember" xlink:href="idt-20200731.xsd#idt_Net2PhonePlatformServicesMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="idt_Net2PhonePlatformServicesMember" order="8" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_GrowthAbstract" xlink:href="idt-20200731.xsd#idt_GrowthAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems" xlink:to="idt_GrowthAbstract" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_Revenues" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Revenues"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_GrowthAbstract" xlink:to="us-gaap_Revenues" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofrevenuesdisaggregatedbygeographicregionTable"> |
| | <loc xlink:type="locator" xlink:label="idt_RevenueRecognitionDetailsScheduleofrevenuesdisaggregatedbygeographicregionLineItems" xlink:href="idt-20200731.xsd#idt_RevenueRecognitionDetailsScheduleofrevenuesdisaggregatedbygeographicregionLineItems"/> |
| | <loc xlink:type="locator" xlink:label="idt_RevenueRecognitionDetailsScheduleofrevenuesdisaggregatedbygeographicregionTable" xlink:href="idt-20200731.xsd#idt_RevenueRecognitionDetailsScheduleofrevenuesdisaggregatedbygeographicregionTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="idt_RevenueRecognitionDetailsScheduleofrevenuesdisaggregatedbygeographicregionLineItems" xlink:to="idt_RevenueRecognitionDetailsScheduleofrevenuesdisaggregatedbygeographicregionTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_StatementGeographicalAxis" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_StatementGeographicalAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_RevenueRecognitionDetailsScheduleofrevenuesdisaggregatedbygeographicregionTable" xlink:to="srt_StatementGeographicalAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_SegmentGeographicalDomain" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_SegmentGeographicalDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_StatementGeographicalAxis" xlink:to="srt_SegmentGeographicalDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_SegmentGeographicalDomain_0" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_SegmentGeographicalDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_StatementGeographicalAxis" xlink:to="srt_SegmentGeographicalDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementBusinessSegmentsAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_RevenueRecognitionDetailsScheduleofrevenuesdisaggregatedbygeographicregionTable" xlink:to="us-gaap_StatementBusinessSegmentsAxis" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SegmentDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementBusinessSegmentsAxis" xlink:to="us-gaap_SegmentDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SegmentDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementBusinessSegmentsAxis" xlink:to="us-gaap_SegmentDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="country_US" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_US"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_SegmentGeographicalDomain" xlink:to="country_US" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="country_GB" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_GB"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_SegmentGeographicalDomain" xlink:to="country_GB" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="country_NL" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_NL"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_SegmentGeographicalDomain" xlink:to="country_NL" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_OtherCountriesMember" xlink:href="idt-20200731.xsd#idt_OtherCountriesMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_SegmentGeographicalDomain" xlink:to="idt_OtherCountriesMember" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_OutsideTheUnitedStatesMember" xlink:href="idt-20200731.xsd#idt_OutsideTheUnitedStatesMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_SegmentGeographicalDomain" xlink:to="idt_OutsideTheUnitedStatesMember" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_TelecomAndPaymentServiceMember" xlink:href="idt-20200731.xsd#idt_TelecomAndPaymentServiceMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentDomain" xlink:to="idt_TelecomAndPaymentServiceMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_Net2phoneMember" xlink:href="idt-20200731.xsd#idt_Net2phoneMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentDomain" xlink:to="idt_Net2phoneMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_Revenues" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Revenues"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_RevenueRecognitionDetailsScheduleofrevenuesdisaggregatedbygeographicregionLineItems" xlink:to="us-gaap_Revenues" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_YearEndedJuly312019Abstract" xlink:href="idt-20200731.xsd#idt_YearEndedJuly312019Abstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_RevenueRecognitionDetailsScheduleofrevenuesdisaggregatedbygeographicregionLineItems" xlink:to="idt_YearEndedJuly312019Abstract" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_OutsideTheUnitedStatesAbstract0" xlink:href="idt-20200731.xsd#idt_OutsideTheUnitedStatesAbstract0"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_YearEndedJuly312019Abstract" xlink:to="idt_OutsideTheUnitedStatesAbstract0" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_OutsideTheUnitedStatesAbstract" xlink:href="idt-20200731.xsd#idt_OutsideTheUnitedStatesAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_RevenueRecognitionDetailsScheduleofrevenuesdisaggregatedbygeographicregionLineItems" xlink:to="idt_OutsideTheUnitedStatesAbstract" order="3" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofdeferredcustomercontractacquisitioncostsTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfDeferredCustomerContractAcquisitionCostsAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfDeferredCustomerContractAcquisitionCostsAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CapitalizedContractCostNetCurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalizedContractCostNetCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfDeferredCustomerContractAcquisitionCostsAbstract" xlink:to="us-gaap_CapitalizedContractCostNetCurrent" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CapitalizedContractCostNetNoncurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalizedContractCostNetNoncurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfDeferredCustomerContractAcquisitionCostsAbstract" xlink:to="us-gaap_CapitalizedContractCostNetNoncurrent" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CapitalizedContractCostNet" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalizedContractCostNet"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfDeferredCustomerContractAcquisitionCostsAbstract" xlink:to="us-gaap_CapitalizedContractCostNet" order="2" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofsupplementaldisclosuresrelatedtotheCompanysoperatingleasesTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfSupplementalDisclosuresRelatedToTheCompanysOperatingLeasesAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfSupplementalDisclosuresRelatedToTheCompanysOperatingLeasesAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingLeaseCost" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseCost"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfSupplementalDisclosuresRelatedToTheCompanysOperatingLeasesAbstract" xlink:to="us-gaap_OperatingLeaseCost" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShortTermLeaseCost" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermLeaseCost"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfSupplementalDisclosuresRelatedToTheCompanysOperatingLeasesAbstract" xlink:to="us-gaap_ShortTermLeaseCost" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LeaseCost" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseCost"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfSupplementalDisclosuresRelatedToTheCompanysOperatingLeasesAbstract" xlink:to="us-gaap_LeaseCost" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CashFlowOperatingActivitiesLesseeAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashFlowOperatingActivitiesLesseeAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfSupplementalDisclosuresRelatedToTheCompanysOperatingLeasesAbstract" xlink:to="us-gaap_CashFlowOperatingActivitiesLesseeAbstract" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingLeasePayments" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasePayments"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_CashFlowOperatingActivitiesLesseeAbstract" xlink:to="us-gaap_OperatingLeasePayments" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofsupplementaldisclosuresrelatedweightedaverageoperatingleasesTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfSupplementalDisclosuresRelatedWeightedAverageOperatingLeasesAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfSupplementalDisclosuresRelatedWeightedAverageOperatingLeasesAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfSupplementalDisclosuresRelatedWeightedAverageOperatingLeasesAbstract" xlink:to="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfSupplementalDisclosuresRelatedWeightedAverageOperatingLeasesAbstract" xlink:to="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent" order="1" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofaggregateoperatingleaseliabilityTable"> |
| | <loc xlink:type="locator" xlink:label="idt_LeasesDetailsScheduleofaggregateoperatingleaseliabilityLineItems" xlink:href="idt-20200731.xsd#idt_LeasesDetailsScheduleofaggregateoperatingleaseliabilityLineItems"/> |
| | <loc xlink:type="locator" xlink:label="idt_LeasesDetailsScheduleofaggregateoperatingleaseliabilityTable" xlink:href="idt-20200731.xsd#idt_LeasesDetailsScheduleofaggregateoperatingleaseliabilityTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="idt_LeasesDetailsScheduleofaggregateoperatingleaseliabilityLineItems" xlink:to="idt_LeasesDetailsScheduleofaggregateoperatingleaseliabilityTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BalanceSheetLocationAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BalanceSheetLocationAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_LeasesDetailsScheduleofaggregateoperatingleaseliabilityTable" xlink:to="us-gaap_BalanceSheetLocationAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BalanceSheetLocationDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BalanceSheetLocationDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_BalanceSheetLocationAxis" xlink:to="us-gaap_BalanceSheetLocationDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BalanceSheetLocationDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BalanceSheetLocationDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_BalanceSheetLocationAxis" xlink:to="us-gaap_BalanceSheetLocationDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherCurrentLiabilitiesMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherCurrentLiabilitiesMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BalanceSheetLocationDomain" xlink:to="us-gaap_OtherCurrentLiabilitiesMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingLeaseLiabilityCurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_LeasesDetailsScheduleofaggregateoperatingleaseliabilityLineItems" xlink:to="us-gaap_OperatingLeaseLiabilityCurrent" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_LeasesDetailsScheduleofaggregateoperatingleaseliabilityLineItems" xlink:to="us-gaap_OperatingLeaseLiabilityNoncurrent" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingLeaseLiability" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiability"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_LeasesDetailsScheduleofaggregateoperatingleaseliabilityLineItems" xlink:to="us-gaap_OperatingLeaseLiability" order="3" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleoffutureminimummaturitiesofoperatingleaseliabilitiesTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfFutureMinimumMaturitiesOfOperatingLeaseLiabilitiesAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfFutureMinimumMaturitiesOfOperatingLeaseLiabilitiesAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfFutureMinimumMaturitiesOfOperatingLeaseLiabilitiesAbstract" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextRollingTwelveMonths" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfFutureMinimumMaturitiesOfOperatingLeaseLiabilitiesAbstract" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearTwo" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfFutureMinimumMaturitiesOfOperatingLeaseLiabilitiesAbstract" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearThree" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfFutureMinimumMaturitiesOfOperatingLeaseLiabilitiesAbstract" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFour" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfFutureMinimumMaturitiesOfOperatingLeaseLiabilitiesAbstract" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterRollingYearFive" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterRollingYearFive"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueInRollingYearFive" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterRollingYearFive" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfFutureMinimumMaturitiesOfOperatingLeaseLiabilitiesAbstract" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfFutureMinimumMaturitiesOfOperatingLeaseLiabilitiesAbstract" xlink:to="us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingLeaseLiability" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiability"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfFutureMinimumMaturitiesOfOperatingLeaseLiabilitiesAbstract" xlink:to="us-gaap_OperatingLeaseLiability" order="7" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleoffutureminimumpaymentsforoperatingleasesTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfFutureMinimumPaymentsForOperatingLeasesAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfFutureMinimumPaymentsForOperatingLeasesAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfFutureMinimumPaymentsForOperatingLeasesAbstract" xlink:to="us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfFutureMinimumPaymentsForOperatingLeasesAbstract" xlink:to="us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfFutureMinimumPaymentsForOperatingLeasesAbstract" xlink:to="us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfFutureMinimumPaymentsForOperatingLeasesAbstract" xlink:to="us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfFutureMinimumPaymentsForOperatingLeasesAbstract" xlink:to="us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears" xlink:to="us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfFutureMinimumPaymentsForOperatingLeasesAbstract" xlink:to="us-gaap_OperatingLeasesFutureMinimumPaymentsDue" order="5" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofcashcashequivalentsandrestrictedcashandcashequivalentsTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfCashCashEquivalentsAndRestrictedCashAndCashEquivalentsAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfCashCashEquivalentsAndRestrictedCashAndCashEquivalentsAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfCashCashEquivalentsAndRestrictedCashAndCashEquivalentsAbstract" xlink:to="us-gaap_CashAndCashEquivalentsAtCarryingValue" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfCashCashEquivalentsAndRestrictedCashAndCashEquivalentsAbstract" xlink:to="us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfCashCashEquivalentsAndRestrictedCashAndCashEquivalentsAbstract" xlink:to="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" order="2" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofacquisitiondatefairvalueofconsiderationTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfAcquisitionDateFairValueOfConsiderationAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfAcquisitionDateFairValueOfConsiderationAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PaymentsToAcquireBusinessesGross" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfAcquisitionDateFairValueOfConsiderationAbstract" xlink:to="us-gaap_PaymentsToAcquireBusinessesGross" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfAcquisitionDateFairValueOfConsiderationAbstract" xlink:to="us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessCombinationConsiderationTransferred1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent" xlink:to="us-gaap_BusinessCombinationConsiderationTransferred1" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofimpactoftheacquisitionspurchasepriceallocationsonconsolidatedbalancesheetTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfImpactOfTheAcquisitionsPurchasePriceAllocationsOnConsolidatedBalanceSheetAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfImpactOfTheAcquisitionsPurchasePriceAllocationsOnConsolidatedBalanceSheetAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfImpactOfTheAcquisitionsPurchasePriceAllocationsOnConsolidatedBalanceSheetAbstract" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfImpactOfTheAcquisitionsPurchasePriceAllocationsOnConsolidatedBalanceSheetAbstract" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfImpactOfTheAcquisitionsPurchasePriceAllocationsOnConsolidatedBalanceSheetAbstract" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_BusinessCombinationRecognizedExcessPurchasePriceGoodwill" xlink:href="idt-20200731.xsd#idt_BusinessCombinationRecognizedExcessPurchasePriceGoodwill"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfImpactOfTheAcquisitionsPurchasePriceAllocationsOnConsolidatedBalanceSheetAbstract" xlink:to="idt_BusinessCombinationRecognizedExcessPurchasePriceGoodwill" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNonCurrentNonCompeteAgreement" xlink:href="idt-20200731.xsd#idt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNonCurrentNonCompeteAgreement"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfImpactOfTheAcquisitionsPurchasePriceAllocationsOnConsolidatedBalanceSheetAbstract" xlink:to="idt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNonCurrentNonCompeteAgreement" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNonCurrentCustomerRelationships" xlink:href="idt-20200731.xsd#idt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNonCurrentCustomerRelationships"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfImpactOfTheAcquisitionsPurchasePriceAllocationsOnConsolidatedBalanceSheetAbstract" xlink:to="idt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNonCurrentCustomerRelationships" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfImpactOfTheAcquisitionsPurchasePriceAllocationsOnConsolidatedBalanceSheetAbstract" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfImpactOfTheAcquisitionsPurchasePriceAllocationsOnConsolidatedBalanceSheetAbstract" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets" order="7" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssets" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssets"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfImpactOfTheAcquisitionsPurchasePriceAllocationsOnConsolidatedBalanceSheetAbstract" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssets" order="8" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfImpactOfTheAcquisitionsPurchasePriceAllocationsOnConsolidatedBalanceSheetAbstract" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable" order="9" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAccruedExpenses" xlink:href="idt-20200731.xsd#idt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAccruedExpenses"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfImpactOfTheAcquisitionsPurchasePriceAllocationsOnConsolidatedBalanceSheetAbstract" xlink:to="idt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAccruedExpenses" order="10" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfImpactOfTheAcquisitionsPurchasePriceAllocationsOnConsolidatedBalanceSheetAbstract" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther" order="11" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfImpactOfTheAcquisitionsPurchasePriceAllocationsOnConsolidatedBalanceSheetAbstract" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities" order="12" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfImpactOfTheAcquisitionsPurchasePriceAllocationsOnConsolidatedBalanceSheetAbstract" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet" order="13" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofconsolidatedbalancesheetandacquisitiondatefairvalueoftotalconsiderationtransferredTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfConsolidatedBalanceSheetAndAcquisitionDateFairValueOfTotalConsiderationTransferredAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfConsolidatedBalanceSheetAndAcquisitionDateFairValueOfTotalConsiderationTransferredAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfConsolidatedBalanceSheetAndAcquisitionDateFairValueOfTotalConsiderationTransferredAbstract" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfConsolidatedBalanceSheetAndAcquisitionDateFairValueOfTotalConsiderationTransferredAbstract" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfConsolidatedBalanceSheetAndAcquisitionDateFairValueOfTotalConsiderationTransferredAbstract" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_idt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentNonCompeteAgreement" xlink:href="idt-20200731.xsd#idt_idt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentNonCompeteAgreement"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfConsolidatedBalanceSheetAndAcquisitionDateFairValueOfTotalConsiderationTransferredAbstract" xlink:to="idt_idt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentNonCompeteAgreement" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_idt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentCustomerRelationships" xlink:href="idt-20200731.xsd#idt_idt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentCustomerRelationships"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfConsolidatedBalanceSheetAndAcquisitionDateFairValueOfTotalConsiderationTransferredAbstract" xlink:to="idt_idt_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentCustomerRelationships" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfConsolidatedBalanceSheetAndAcquisitionDateFairValueOfTotalConsiderationTransferredAbstract" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfConsolidatedBalanceSheetAndAcquisitionDateFairValueOfTotalConsiderationTransferredAbstract" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfConsolidatedBalanceSheetAndAcquisitionDateFairValueOfTotalConsiderationTransferredAbstract" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable" order="7" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfConsolidatedBalanceSheetAndAcquisitionDateFairValueOfTotalConsiderationTransferredAbstract" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther" order="8" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfConsolidatedBalanceSheetAndAcquisitionDateFairValueOfTotalConsiderationTransferredAbstract" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther" order="9" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessCombinationConsiderationTransferred1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfConsolidatedBalanceSheetAndAcquisitionDateFairValueOfTotalConsiderationTransferredAbstract" xlink:to="us-gaap_BusinessCombinationConsiderationTransferred1" order="10" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PaymentsToAcquireBusinessesGross" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BusinessCombinationConsiderationTransferred1" xlink:to="us-gaap_PaymentsToAcquireBusinessesGross" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BusinessCombinationConsiderationTransferred1" xlink:to="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents" order="1" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofavailableforsalesecuritiesTable"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_MarketableSecuritiesLineItems" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MarketableSecuritiesLineItems"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_MarketableSecuritiesTable" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MarketableSecuritiesTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_MarketableSecuritiesLineItems" xlink:to="us-gaap_MarketableSecuritiesTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_InformationByCategoryOfDebtSecurityAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InformationByCategoryOfDebtSecurityAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_MarketableSecuritiesTable" xlink:to="us-gaap_InformationByCategoryOfDebtSecurityAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCategoriesOfInvestmentsDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCategoriesOfInvestmentsDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_InformationByCategoryOfDebtSecurityAxis" xlink:to="us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCategoriesOfInvestmentsDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCategoriesOfInvestmentsDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCategoriesOfInvestmentsDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_InformationByCategoryOfDebtSecurityAxis" xlink:to="us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCategoriesOfInvestmentsDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CertificatesOfDepositMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CertificatesOfDepositMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCategoriesOfInvestmentsDomain" xlink:to="us-gaap_CertificatesOfDepositMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_USTreasuryBillSecuritiesMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_USTreasuryBillSecuritiesMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCategoriesOfInvestmentsDomain" xlink:to="us-gaap_USTreasuryBillSecuritiesMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_MunicipalBondsMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MunicipalBondsMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCategoriesOfInvestmentsDomain" xlink:to="us-gaap_MunicipalBondsMember" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_MarketableSecuritiesLineItems" xlink:to="us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_MarketableSecuritiesLineItems" xlink:to="us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_MarketableSecuritiesLineItems" xlink:to="us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_MarketableSecuritiesLineItems" xlink:to="us-gaap_AvailableForSaleSecuritiesDebtSecurities" order="4" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofcontractualmaturitiesofavailableforsaledebtsecuritiesTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfContractualMaturitiesOfAvailableForSaleDebtSecuritiesAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfContractualMaturitiesOfAvailableForSaleDebtSecuritiesAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfContractualMaturitiesOfAvailableForSaleDebtSecuritiesAbstract" xlink:to="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfContractualMaturitiesOfAvailableForSaleDebtSecuritiesAbstract" xlink:to="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfContractualMaturitiesOfAvailableForSaleDebtSecuritiesAbstract" xlink:to="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfContractualMaturitiesOfAvailableForSaleDebtSecuritiesAbstract" xlink:to="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfContractualMaturitiesOfAvailableForSaleDebtSecuritiesAbstract" xlink:to="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate" order="4" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofavailableforsalesecuritiesunrealizedlosspositionTable"> |
| | <loc xlink:type="locator" xlink:label="idt_DebtSecuritiesDetailsScheduleofavailableforsalesecuritiesunrealizedlosspositionLineItems" xlink:href="idt-20200731.xsd#idt_DebtSecuritiesDetailsScheduleofavailableforsalesecuritiesunrealizedlosspositionLineItems"/> |
| | <loc xlink:type="locator" xlink:label="idt_DebtSecuritiesDetailsScheduleofavailableforsalesecuritiesunrealizedlosspositionTable" xlink:href="idt-20200731.xsd#idt_DebtSecuritiesDetailsScheduleofavailableforsalesecuritiesunrealizedlosspositionTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="idt_DebtSecuritiesDetailsScheduleofavailableforsalesecuritiesunrealizedlosspositionLineItems" xlink:to="idt_DebtSecuritiesDetailsScheduleofavailableforsalesecuritiesunrealizedlosspositionTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FinancialInstrumentAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_DebtSecuritiesDetailsScheduleofavailableforsalesecuritiesunrealizedlosspositionTable" xlink:to="us-gaap_FinancialInstrumentAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_FinancialInstrumentAxis" xlink:to="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_FinancialInstrumentAxis" xlink:to="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_MunicipalBondsMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MunicipalBondsMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:to="us-gaap_MunicipalBondsMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DebtSecuritiesDetailsScheduleofavailableforsalesecuritiesunrealizedlosspositionLineItems" xlink:to="us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DebtSecuritiesDetailsScheduleofavailableforsalesecuritiesunrealizedlosspositionLineItems" xlink:to="us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_July312019Abstract0" xlink:href="idt-20200731.xsd#idt_July312019Abstract0"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DebtSecuritiesDetailsScheduleofavailableforsalesecuritiesunrealizedlosspositionLineItems" xlink:to="idt_July312019Abstract0" order="3" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofequityinvestmentsTable"> |
| | <loc xlink:type="locator" xlink:label="idt_EquityInvestmentsDetailsScheduleofequityinvestmentsLineItems" xlink:href="idt-20200731.xsd#idt_EquityInvestmentsDetailsScheduleofequityinvestmentsLineItems"/> |
| | <loc xlink:type="locator" xlink:label="idt_EquityInvestmentsDetailsScheduleofequityinvestmentsTable" xlink:href="idt-20200731.xsd#idt_EquityInvestmentsDetailsScheduleofequityinvestmentsTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="idt_EquityInvestmentsDetailsScheduleofequityinvestmentsLineItems" xlink:to="idt_EquityInvestmentsDetailsScheduleofequityinvestmentsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementClassOfStockAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementClassOfStockAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_EquityInvestmentsDetailsScheduleofequityinvestmentsTable" xlink:to="us-gaap_StatementClassOfStockAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_LegalEntityAxis" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_LegalEntityAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_EquityInvestmentsDetailsScheduleofequityinvestmentsTable" xlink:to="dei_LegalEntityAxis" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityDomain" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityDomain_0" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherComprehensiveIncomeLocationAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLocationAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_EquityInvestmentsDetailsScheduleofequityinvestmentsTable" xlink:to="us-gaap_OtherComprehensiveIncomeLocationAxis" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherComprehensiveIncomeLocationDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLocationDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_OtherComprehensiveIncomeLocationAxis" xlink:to="us-gaap_OtherComprehensiveIncomeLocationDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherComprehensiveIncomeLocationDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLocationDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_OtherComprehensiveIncomeLocationAxis" xlink:to="us-gaap_OtherComprehensiveIncomeLocationDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_InvestmentTypeAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentTypeAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_EquityInvestmentsDetailsScheduleofequityinvestmentsTable" xlink:to="us-gaap_InvestmentTypeAxis" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_InvestmentTypeCategorizationMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_InvestmentTypeAxis" xlink:to="us-gaap_InvestmentTypeCategorizationMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_InvestmentTypeCategorizationMember_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_InvestmentTypeAxis" xlink:to="us-gaap_InvestmentTypeCategorizationMember_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CommonClassBMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonClassBMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="us-gaap_CommonClassBMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SeriesCPreferredStockMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SeriesCPreferredStockMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="us-gaap_SeriesCPreferredStockMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_ZedgeIncMember" xlink:href="idt-20200731.xsd#idt_ZedgeIncMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="idt_ZedgeIncMember" order="0" xbrldt:closed="true"/> |
| | <!-- [WMV5][XcpuxYn59dz7vgYynUDuwG7r97K2jUTysl7vcz0lJt/tSeJz73kx1cLt0ZFF2SK/vxBCY0vdSrazRC6HY9rqpLEeU+fpctc2NaTu4x24EmOquxP/Ox4OC8YGgPcryxa5X6eVf+vkJh6plu9esxQ/8g/3Nb/zpwXvfHvV/P9kjIVspJsLlBvP2EItdwq1ZJy+J7ER7MlEYGpy01/gXH9Hfs7q8UiOu78EX+4erEMHCtBsK7NiBZp2s9zqLBcKW+Fl] CSR --> |
| | <loc xlink:type="locator" xlink:label="idt_RafaelHoldingsIncMember" xlink:href="idt-20200731.xsd#idt_RafaelHoldingsIncMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="idt_RafaelHoldingsIncMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherInvestmentsMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherInvestmentsMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherComprehensiveIncomeLocationDomain" xlink:to="us-gaap_OtherInvestmentsMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_MutualFundMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MutualFundMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="us-gaap_MutualFundMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_HedgeFundsMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HedgeFundsMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeCategorizationMember" xlink:to="us-gaap_HedgeFundsMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherShortTermInvestments" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherShortTermInvestments"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_EquityInvestmentsDetailsScheduleofequityinvestmentsLineItems" xlink:to="us-gaap_OtherShortTermInvestments" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LongTermInvestments" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermInvestments"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_OtherShortTermInvestments" xlink:to="us-gaap_LongTermInvestments" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofequityinvestmentsTable_Parentheticals"> |
| | <loc xlink:type="locator" xlink:label="idt_EquityInvestmentsDetailsScheduleofequityinvestmentsParentheticalsLineItems" xlink:href="idt-20200731.xsd#idt_EquityInvestmentsDetailsScheduleofequityinvestmentsParentheticalsLineItems"/> |
| | <loc xlink:type="locator" xlink:label="idt_EquityInvestmentsDetailsScheduleofequityinvestmentsParentheticalsTable" xlink:href="idt-20200731.xsd#idt_EquityInvestmentsDetailsScheduleofequityinvestmentsParentheticalsTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="idt_EquityInvestmentsDetailsScheduleofequityinvestmentsParentheticalsLineItems" xlink:to="idt_EquityInvestmentsDetailsScheduleofequityinvestmentsParentheticalsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementClassOfStockAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementClassOfStockAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_EquityInvestmentsDetailsScheduleofequityinvestmentsParentheticalsTable" xlink:to="us-gaap_StatementClassOfStockAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_LegalEntityAxis" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_LegalEntityAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_EquityInvestmentsDetailsScheduleofequityinvestmentsParentheticalsTable" xlink:to="dei_LegalEntityAxis" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityDomain" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityDomain_0" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CommonClassBMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonClassBMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="us-gaap_CommonClassBMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_ZedgeIncMember" xlink:href="idt-20200731.xsd#idt_ZedgeIncMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="idt_ZedgeIncMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_RafaelHoldingsIncMember" xlink:href="idt-20200731.xsd#idt_RafaelHoldingsIncMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="idt_RafaelHoldingsIncMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_NumberOfRelatedPartySharesReceivedInConnectionWithRestrictedStock" xlink:href="idt-20200731.xsd#idt_NumberOfRelatedPartySharesReceivedInConnectionWithRestrictedStock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_EquityInvestmentsDetailsScheduleofequityinvestmentsParentheticalsLineItems" xlink:to="idt_NumberOfRelatedPartySharesReceivedInConnectionWithRestrictedStock" order="1" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofcarryingvalueofequityinvestmentsTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfCarryingValueOfEquityInvestmentsAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfCarryingValueOfEquityInvestmentsAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EquitySecuritiesFvNi" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquitySecuritiesFvNi"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfCarryingValueOfEquityInvestmentsAbstract" xlink:to="us-gaap_EquitySecuritiesFvNi" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_AdoptionOfChangeInAccountingForEquityInvestments" xlink:href="idt-20200731.xsd#idt_AdoptionOfChangeInAccountingForEquityInvestments"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfCarryingValueOfEquityInvestmentsAbstract" xlink:to="idt_AdoptionOfChangeInAccountingForEquityInvestments" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_EquitySecuritiesFvNiAdjusted" xlink:href="idt-20200731.xsd#idt_EquitySecuritiesFvNiAdjusted"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfCarryingValueOfEquityInvestmentsAbstract" xlink:to="idt_EquitySecuritiesFvNiAdjusted" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfCarryingValueOfEquityInvestmentsAbstract" xlink:to="us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_EquitySecuritiesWithoutReadilyDeterminableFairValueOtherUpwardPriceAdjustmentAnnualAmount" xlink:href="idt-20200731.xsd#idt_EquitySecuritiesWithoutReadilyDeterminableFairValueOtherUpwardPriceAdjustmentAnnualAmount"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfCarryingValueOfEquityInvestmentsAbstract" xlink:to="idt_EquitySecuritiesWithoutReadilyDeterminableFairValueOtherUpwardPriceAdjustmentAnnualAmount" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_EquitySecuritiesWithoutReadilyDeterminableFairValueRedemptionsAnnualAmount" xlink:href="idt-20200731.xsd#idt_EquitySecuritiesWithoutReadilyDeterminableFairValueRedemptionsAnnualAmount"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfCarryingValueOfEquityInvestmentsAbstract" xlink:to="idt_EquitySecuritiesWithoutReadilyDeterminableFairValueRedemptionsAnnualAmount" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfCarryingValueOfEquityInvestmentsAbstract" xlink:to="us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount" order="6" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofunrealizedgainsandlossesforallequityinvestmentsTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfUnrealizedGainsAndLossesForAllEquityInvestmentsAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfUnrealizedGainsAndLossesForAllEquityInvestmentsAbstract"/> |
| | <loc xlink:type="locator" xlink:label="idt_EquitySecuritiesFvNiRecognizedGainLossNet" xlink:href="idt-20200731.xsd#idt_EquitySecuritiesFvNiRecognizedGainLossNet"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfUnrealizedGainsAndLossesForAllEquityInvestmentsAbstract" xlink:to="idt_EquitySecuritiesFvNiRecognizedGainLossNet" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_EquitySecuritiesFvNiRecognizedGainLossNetOnEquitySecuritiesSold" xlink:href="idt-20200731.xsd#idt_EquitySecuritiesFvNiRecognizedGainLossNetOnEquitySecuritiesSold"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfUnrealizedGainsAndLossesForAllEquityInvestmentsAbstract" xlink:to="idt_EquitySecuritiesFvNiRecognizedGainLossNetOnEquitySecuritiesSold" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_EquitySecuritiesFvNiRecognizedUnrealizedGainLossNetEquitySecuritiesHeld" xlink:href="idt-20200731.xsd#idt_EquitySecuritiesFvNiRecognizedUnrealizedGainLossNetEquitySecuritiesHeld"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfUnrealizedGainsAndLossesForAllEquityInvestmentsAbstract" xlink:to="idt_EquitySecuritiesFvNiRecognizedUnrealizedGainLossNetEquitySecuritiesHeld" order="2" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofbalanceofassetsmeasuredatfairvalueonarecurringbasisTable"> |
| | <loc xlink:type="locator" xlink:label="idt_FairValueMeasurementsDetailsScheduleofbalanceofassetsmeasuredatfairvalueonarecurringbasisLineItems" xlink:href="idt-20200731.xsd#idt_FairValueMeasurementsDetailsScheduleofbalanceofassetsmeasuredatfairvalueonarecurringbasisLineItems"/> |
| | <loc xlink:type="locator" xlink:label="idt_FairValueMeasurementsDetailsScheduleofbalanceofassetsmeasuredatfairvalueonarecurringbasisTable" xlink:href="idt-20200731.xsd#idt_FairValueMeasurementsDetailsScheduleofbalanceofassetsmeasuredatfairvalueonarecurringbasisTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="idt_FairValueMeasurementsDetailsScheduleofbalanceofassetsmeasuredatfairvalueonarecurringbasisLineItems" xlink:to="idt_FairValueMeasurementsDetailsScheduleofbalanceofassetsmeasuredatfairvalueonarecurringbasisTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_FairValueMeasurementsDetailsScheduleofbalanceofassetsmeasuredatfairvalueonarecurringbasisTable" xlink:to="us-gaap_FairValueByFairValueHierarchyLevelAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:to="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:to="us-gaap_FairValueMeasurementsFairValueHierarchyDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FairValueByMeasurementFrequencyAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_FairValueMeasurementsDetailsScheduleofbalanceofassetsmeasuredatfairvalueonarecurringbasisTable" xlink:to="us-gaap_FairValueByMeasurementFrequencyAxis" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FairValueMeasurementFrequencyDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_FairValueByMeasurementFrequencyAxis" xlink:to="us-gaap_FairValueMeasurementFrequencyDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FairValueMeasurementFrequencyDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_FairValueByMeasurementFrequencyAxis" xlink:to="us-gaap_FairValueMeasurementFrequencyDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FairValueMeasurementsRecurringMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueMeasurementFrequencyDomain" xlink:to="us-gaap_FairValueMeasurementsRecurringMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FairValueInputsLevel1Member" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel1Member"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:to="us-gaap_FairValueInputsLevel1Member" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FairValueInputsLevel2Member" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel2Member"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:to="us-gaap_FairValueInputsLevel2Member" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FairValueInputsLevel3Member" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:to="us-gaap_FairValueInputsLevel3Member" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_FairValueMeasurementsDetailsScheduleofbalanceofassetsmeasuredatfairvalueonarecurringbasisLineItems" xlink:to="us-gaap_AvailableForSaleSecuritiesDebtSecurities" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_EquityInvestmentsCurrentAsset" xlink:href="idt-20200731.xsd#idt_EquityInvestmentsCurrentAsset"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:to="idt_EquityInvestmentsCurrentAsset" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_EquityInvestmentsNoncurrentAssets" xlink:href="idt-20200731.xsd#idt_EquityInvestmentsNoncurrentAssets"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:to="idt_EquityInvestmentsNoncurrentAssets" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_InvestmentsFairValueDisclosure" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentsFairValueDisclosure"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:to="us-gaap_InvestmentsFairValueDisclosure" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_ContingentConsiderationIncludedInOtherNoncurrentLiabilities" xlink:href="idt-20200731.xsd#idt_ContingentConsiderationIncludedInOtherNoncurrentLiabilities"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:to="idt_ContingentConsiderationIncludedInOtherNoncurrentLiabilities" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_July312019Abstract00" xlink:href="idt-20200731.xsd#idt_July312019Abstract00"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_FairValueMeasurementsDetailsScheduleofbalanceofassetsmeasuredatfairvalueonarecurringbasisLineItems" xlink:to="idt_July312019Abstract00" order="2" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofassetsmeasuredatfairvalueonarecurringbasisusingsignificantunobservableinputsLevel3Table"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:to="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_StatementScenarioAxis" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_StatementScenarioAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable" xlink:to="srt_StatementScenarioAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_ScenarioUnspecifiedDomain" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ScenarioUnspecifiedDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_StatementScenarioAxis" xlink:to="srt_ScenarioUnspecifiedDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_ScenarioUnspecifiedDomain_0" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ScenarioUnspecifiedDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_StatementScenarioAxis" xlink:to="srt_ScenarioUnspecifiedDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevelThreeFromAdoptionOfAccountingChange" xlink:href="idt-20200731.xsd#idt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevelThreeFromAdoptionOfAccountingChange"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:to="idt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevelThreeFromAdoptionOfAccountingChange" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_AmountOfChangeInUnrealizedGainsOrLossesIncludedInEarningsForAssetsHeldAtEndOfPeriod" xlink:href="idt-20200731.xsd#idt_AmountOfChangeInUnrealizedGainsOrLossesIncludedInEarningsForAssetsHeldAtEndOfPeriod"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:to="idt_AmountOfChangeInUnrealizedGainsOrLossesIncludedInEarningsForAssetsHeldAtEndOfPeriod" order="4" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofliabilitiesmeasuredatfairvalueonarecurringbasisusingsignificantunobservableinputsLevel3Table"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfLiabilitiesMeasuredAtFairValueOnARecurringBasisUsingSignificantUnobservableInputsLevel3Abstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfLiabilitiesMeasuredAtFairValueOnARecurringBasisUsingSignificantUnobservableInputsLevel3Abstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfLiabilitiesMeasuredAtFairValueOnARecurringBasisUsingSignificantUnobservableInputsLevel3Abstract" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitiesTransfersIntoLevelThreeFromAcquisition" xlink:href="idt-20200731.xsd#idt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitiesTransfersIntoLevelThreeFromAcquisition"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfLiabilitiesMeasuredAtFairValueOnARecurringBasisUsingSignificantUnobservableInputsLevel3Abstract" xlink:to="idt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitiesTransfersIntoLevelThreeFromAcquisition" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfLiabilitiesMeasuredAtFairValueOnARecurringBasisUsingSignificantUnobservableInputsLevel3Abstract" xlink:to="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_AmountOfChangeInUnrealizedGainsOrLossesIncludedInEarningsForLiabilitiesHeldAtEndOfPeriod" xlink:href="idt-20200731.xsd#idt_AmountOfChangeInUnrealizedGainsOrLossesIncludedInEarningsForLiabilitiesHeldAtEndOfPeriod"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfLiabilitiesMeasuredAtFairValueOnARecurringBasisUsingSignificantUnobservableInputsLevel3Abstract" xlink:to="idt_AmountOfChangeInUnrealizedGainsOrLossesIncludedInEarningsForLiabilitiesHeldAtEndOfPeriod" order="3" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofpropertyplantandequipmentTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfPropertyPlantAndEquipmentAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfPropertyPlantAndEquipmentAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_MachineryAndEquipmentGross" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MachineryAndEquipmentGross"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfPropertyPlantAndEquipmentAbstract" xlink:to="us-gaap_MachineryAndEquipmentGross" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CapitalizedComputerSoftwareGross" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalizedComputerSoftwareGross"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfPropertyPlantAndEquipmentAbstract" xlink:to="us-gaap_CapitalizedComputerSoftwareGross" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LeaseholdImprovementsGross" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseholdImprovementsGross"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfPropertyPlantAndEquipmentAbstract" xlink:to="us-gaap_LeaseholdImprovementsGross" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FurnitureAndFixturesGross" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FurnitureAndFixturesGross"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfPropertyPlantAndEquipmentAbstract" xlink:to="us-gaap_FurnitureAndFixturesGross" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PropertyPlantAndEquipmentGross" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfPropertyPlantAndEquipmentAbstract" xlink:to="us-gaap_PropertyPlantAndEquipmentGross" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfPropertyPlantAndEquipmentAbstract" xlink:to="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PropertyPlantAndEquipmentNet" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfPropertyPlantAndEquipmentAbstract" xlink:to="us-gaap_PropertyPlantAndEquipmentNet" order="6" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofchangeincarryingamountofgoodwillbyoperatingsegmentTable"> |
| | <loc xlink:type="locator" xlink:label="idt_GoodwillDetailsScheduleofchangeincarryingamountofgoodwillbyoperatingsegmentLineItems" xlink:href="idt-20200731.xsd#idt_GoodwillDetailsScheduleofchangeincarryingamountofgoodwillbyoperatingsegmentLineItems"/> |
| | <loc xlink:type="locator" xlink:label="idt_GoodwillDetailsScheduleofchangeincarryingamountofgoodwillbyoperatingsegmentTable" xlink:href="idt-20200731.xsd#idt_GoodwillDetailsScheduleofchangeincarryingamountofgoodwillbyoperatingsegmentTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="idt_GoodwillDetailsScheduleofchangeincarryingamountofgoodwillbyoperatingsegmentLineItems" xlink:to="idt_GoodwillDetailsScheduleofchangeincarryingamountofgoodwillbyoperatingsegmentTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementBusinessSegmentsAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_GoodwillDetailsScheduleofchangeincarryingamountofgoodwillbyoperatingsegmentTable" xlink:to="us-gaap_StatementBusinessSegmentsAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SegmentDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementBusinessSegmentsAxis" xlink:to="us-gaap_SegmentDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SegmentDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementBusinessSegmentsAxis" xlink:to="us-gaap_SegmentDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_TelecomAndPaymentServicesMember" xlink:href="idt-20200731.xsd#idt_TelecomAndPaymentServicesMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentDomain" xlink:to="idt_TelecomAndPaymentServicesMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_Net2phoneMember" xlink:href="idt-20200731.xsd#idt_Net2phoneMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentDomain" xlink:to="idt_Net2phoneMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_Goodwill" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_GoodwillDetailsScheduleofchangeincarryingamountofgoodwillbyoperatingsegmentLineItems" xlink:to="us-gaap_Goodwill" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_GoodwillAcquiredDuringPeriod" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillAcquiredDuringPeriod"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_GoodwillDetailsScheduleofchangeincarryingamountofgoodwillbyoperatingsegmentLineItems" xlink:to="us-gaap_GoodwillAcquiredDuringPeriod" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_GoodwillForeignCurrencyTranslationGainLoss" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_GoodwillDetailsScheduleofchangeincarryingamountofgoodwillbyoperatingsegmentLineItems" xlink:to="us-gaap_GoodwillForeignCurrencyTranslationGainLoss" order="3" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofpresentsinformationontheCompanysamortizedintangibleassetsTable"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:to="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:to="us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_TradeNamesMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TradeNamesMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:to="us-gaap_TradeNamesMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_NoncompeteAgreementsMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoncompeteAgreementsMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:to="us-gaap_NoncompeteAgreementsMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CustomerRelationshipsMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CustomerRelationshipsMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:to="us-gaap_CustomerRelationshipsMember" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:to="us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FiniteLivedIntangibleAssetsGross" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:to="us-gaap_FiniteLivedIntangibleAssetsGross" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:to="us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FiniteLivedIntangibleAssetsNet" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:to="us-gaap_FiniteLivedIntangibleAssetsNet" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_July312019Abstract000" xlink:href="idt-20200731.xsd#idt_July312019Abstract000"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:to="idt_July312019Abstract000" order="5" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofotheroperatingexpensenetTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfOtherOperatingExpenseNetAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfOtherOperatingExpenseNetAbstract"/> |
| | <loc xlink:type="locator" xlink:label="idt_GainLossInPeriodFromLegalFeesNetOfInsuranceClaims" xlink:href="idt-20200731.xsd#idt_GainLossInPeriodFromLegalFeesNetOfInsuranceClaims"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfOtherOperatingExpenseNetAbstract" xlink:to="idt_GainLossInPeriodFromLegalFeesNetOfInsuranceClaims" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_Net2phoneindemnificationClaim" xlink:href="idt-20200731.xsd#idt_Net2phoneindemnificationClaim"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfOtherOperatingExpenseNetAbstract" xlink:to="idt_Net2phoneindemnificationClaim" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_Net2phoneOtherNet" xlink:href="idt-20200731.xsd#idt_Net2phoneOtherNet"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfOtherOperatingExpenseNetAbstract" xlink:to="idt_Net2phoneOtherNet" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_AccrualForNonIncomeRelatedTaxes" xlink:href="idt-20200731.xsd#idt_AccrualForNonIncomeRelatedTaxes"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfOtherOperatingExpenseNetAbstract" xlink:to="idt_AccrualForNonIncomeRelatedTaxes" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_WriteoffOfAssets" xlink:href="idt-20200731.xsd#idt_WriteoffOfAssets"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfOtherOperatingExpenseNetAbstract" xlink:to="idt_WriteoffOfAssets" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_AccrualForLegalMatter" xlink:href="idt-20200731.xsd#idt_AccrualForLegalMatter"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfOtherOperatingExpenseNetAbstract" xlink:to="idt_AccrualForLegalMatter" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_SaleOfCallingCardBusinessInAsia" xlink:href="idt-20200731.xsd#idt_SaleOfCallingCardBusinessInAsia"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfOtherOperatingExpenseNetAbstract" xlink:to="idt_SaleOfCallingCardBusinessInAsia" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherOperatingIncomeExpenseNet" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherOperatingIncomeExpenseNet"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfOtherOperatingExpenseNetAbstract" xlink:to="us-gaap_OtherOperatingIncomeExpenseNet" order="7" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofaccruedexpensesTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfAccruedExpensesAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfAccruedExpensesAbstract"/> |
| | <loc xlink:type="locator" xlink:label="idt_CarrierMinutesTermination" xlink:href="idt-20200731.xsd#idt_CarrierMinutesTermination"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfAccruedExpensesAbstract" xlink:to="idt_CarrierMinutesTermination" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_CarrierNetworkConnectivityServices" xlink:href="idt-20200731.xsd#idt_CarrierNetworkConnectivityServices"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfAccruedExpensesAbstract" xlink:to="idt_CarrierNetworkConnectivityServices" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_AccruedRegulatoryFeesCurrent" xlink:href="idt-20200731.xsd#idt_AccruedRegulatoryFeesCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfAccruedExpensesAbstract" xlink:to="idt_AccruedRegulatoryFeesCurrent" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EmployeeRelatedLiabilitiesCurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfAccruedExpensesAbstract" xlink:to="us-gaap_EmployeeRelatedLiabilitiesCurrent" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AccruedProfessionalFeesCurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedProfessionalFeesCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfAccruedExpensesAbstract" xlink:to="us-gaap_AccruedProfessionalFeesCurrent" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherAccruedLiabilitiesCurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAccruedLiabilitiesCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfAccruedExpensesAbstract" xlink:to="us-gaap_OtherAccruedLiabilitiesCurrent" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AccruedLiabilitiesCurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfAccruedExpensesAbstract" xlink:to="us-gaap_AccruedLiabilitiesCurrent" order="6" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofotherexpenseincomenetTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfOtherExpenseIncomeNetAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfOtherExpenseIncomeNetAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ForeignCurrencyTransactionGainLossRealized" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignCurrencyTransactionGainLossRealized"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfOtherExpenseIncomeNetAbstract" xlink:to="us-gaap_ForeignCurrencyTransactionGainLossRealized" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_WriteoffOfTaxAssetsRelatedToPriorPeriods" xlink:href="idt-20200731.xsd#idt_WriteoffOfTaxAssetsRelatedToPriorPeriods"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfOtherExpenseIncomeNetAbstract" xlink:to="idt_WriteoffOfTaxAssetsRelatedToPriorPeriods" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_GainLossOnInvestments" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainLossOnInvestments"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfOtherExpenseIncomeNetAbstract" xlink:to="us-gaap_GainLossOnInvestments" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherNonoperatingIncomeExpense" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfOtherExpenseIncomeNetAbstract" xlink:to="us-gaap_OtherNonoperatingIncomeExpense" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_NonoperatingIncomeExpense" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NonoperatingIncomeExpense"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfOtherExpenseIncomeNetAbstract" xlink:to="us-gaap_NonoperatingIncomeExpense" order="4" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofincomebeforeincometaxesTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfIncomeBeforeIncomeTaxesAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfIncomeBeforeIncomeTaxesAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfIncomeBeforeIncomeTaxesAbstract" xlink:to="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfIncomeBeforeIncomeTaxesAbstract" xlink:to="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfIncomeBeforeIncomeTaxesAbstract" xlink:to="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" order="2" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofdeferredincometaxassetsTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfDeferredIncomeTaxAssetsAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfDeferredIncomeTaxAssetsAbstract"/> |
| | <loc xlink:type="locator" xlink:label="idt_DeferredIncomeTaxAssetsAbstract" xlink:href="idt-20200731.xsd#idt_DeferredIncomeTaxAssetsAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfDeferredIncomeTaxAssetsAbstract" xlink:to="idt_DeferredIncomeTaxAssetsAbstract" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DeferredIncomeTaxAssetsAbstract" xlink:to="us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DeferredIncomeTaxAssetsAbstract" xlink:to="us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DeferredIncomeTaxAssetsAbstract" xlink:to="us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DeferredIncomeTaxAssetsAbstract" xlink:to="us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_DeferredTaxAssetsDepreciation" xlink:href="idt-20200731.xsd#idt_DeferredTaxAssetsDepreciation"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DeferredIncomeTaxAssetsAbstract" xlink:to="idt_DeferredTaxAssetsDepreciation" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_DeferredTaxAssetsUnrealizedGains" xlink:href="idt-20200731.xsd#idt_DeferredTaxAssetsUnrealizedGains"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DeferredIncomeTaxAssetsAbstract" xlink:to="idt_DeferredTaxAssetsUnrealizedGains" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DeferredTaxAssetsOperatingLossCarryforwards" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwards"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DeferredIncomeTaxAssetsAbstract" xlink:to="us-gaap_DeferredTaxAssetsOperatingLossCarryforwards" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DeferredTaxAssetsOther" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsOther"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DeferredIncomeTaxAssetsAbstract" xlink:to="us-gaap_DeferredTaxAssetsOther" order="7" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DeferredTaxAssetsDeferredIncome" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsDeferredIncome"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DeferredIncomeTaxAssetsAbstract" xlink:to="us-gaap_DeferredTaxAssetsDeferredIncome" order="8" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DeferredTaxAssetsGross" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsGross"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfDeferredIncomeTaxAssetsAbstract" xlink:to="us-gaap_DeferredTaxAssetsGross" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DeferredTaxAssetsValuationAllowance" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfDeferredIncomeTaxAssetsAbstract" xlink:to="us-gaap_DeferredTaxAssetsValuationAllowance" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DeferredTaxAssetsLiabilitiesNet" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNet"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfDeferredIncomeTaxAssetsAbstract" xlink:to="us-gaap_DeferredTaxAssetsLiabilitiesNet" order="3" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofbenefitfromprovisionforincometaxesTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfBenefitFromProvisionForIncomeTaxesAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfBenefitFromProvisionForIncomeTaxesAbstract"/> |
| | <loc xlink:type="locator" xlink:label="idt_CurrentAbstract" xlink:href="idt-20200731.xsd#idt_CurrentAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfBenefitFromProvisionForIncomeTaxesAbstract" xlink:to="idt_CurrentAbstract" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CurrentFederalTaxExpenseBenefit" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CurrentFederalTaxExpenseBenefit"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_CurrentAbstract" xlink:to="us-gaap_CurrentFederalTaxExpenseBenefit" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CurrentStateAndLocalTaxExpenseBenefit" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CurrentStateAndLocalTaxExpenseBenefit"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_CurrentAbstract" xlink:to="us-gaap_CurrentStateAndLocalTaxExpenseBenefit" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CurrentForeignTaxExpenseBenefit" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CurrentForeignTaxExpenseBenefit"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_CurrentAbstract" xlink:to="us-gaap_CurrentForeignTaxExpenseBenefit" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CurrentIncomeTaxExpenseBenefit" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_CurrentAbstract" xlink:to="us-gaap_CurrentIncomeTaxExpenseBenefit" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_DeferredAbstract" xlink:href="idt-20200731.xsd#idt_DeferredAbstract"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfBenefitFromProvisionForIncomeTaxesAbstract" xlink:to="idt_DeferredAbstract" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DeferredFederalIncomeTaxExpenseBenefit" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredFederalIncomeTaxExpenseBenefit"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DeferredAbstract" xlink:to="us-gaap_DeferredFederalIncomeTaxExpenseBenefit" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DeferredAbstract" xlink:to="us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DeferredForeignIncomeTaxExpenseBenefit" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredForeignIncomeTaxExpenseBenefit"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DeferredAbstract" xlink:to="us-gaap_DeferredForeignIncomeTaxExpenseBenefit" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DeferredAbstract" xlink:to="us-gaap_DeferredIncomeTaxExpenseBenefit" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncomeTaxExpenseBenefit" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfBenefitFromProvisionForIncomeTaxesAbstract" xlink:to="us-gaap_IncomeTaxExpenseBenefit" order="2" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofUSfederalstatutoryincometaxrateandincometaxesprovidedTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfUSFederalStatutoryIncomeTaxRateAndIncomeTaxesProvidedAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfUSFederalStatutoryIncomeTaxRateAndIncomeTaxesProvidedAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfUSFederalStatutoryIncomeTaxRateAndIncomeTaxesProvidedAbstract" xlink:to="us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_IncomeTaxReconciliationTransitionTaxOnForeignEarnings" xlink:href="idt-20200731.xsd#idt_IncomeTaxReconciliationTransitionTaxOnForeignEarnings"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfUSFederalStatutoryIncomeTaxRateAndIncomeTaxesProvidedAbstract" xlink:to="idt_IncomeTaxReconciliationTransitionTaxOnForeignEarnings" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfUSFederalStatutoryIncomeTaxRateAndIncomeTaxesProvidedAbstract" xlink:to="us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfUSFederalStatutoryIncomeTaxRateAndIncomeTaxesProvidedAbstract" xlink:to="us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfUSFederalStatutoryIncomeTaxRateAndIncomeTaxesProvidedAbstract" xlink:to="us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncomeTaxReconciliationOtherReconcilingItems" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxReconciliationOtherReconcilingItems"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfUSFederalStatutoryIncomeTaxRateAndIncomeTaxesProvidedAbstract" xlink:to="us-gaap_IncomeTaxReconciliationOtherReconcilingItems" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncomeTaxReconciliationNondeductibleExpenseRestructuringCharges" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxReconciliationNondeductibleExpenseRestructuringCharges"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfUSFederalStatutoryIncomeTaxRateAndIncomeTaxesProvidedAbstract" xlink:to="us-gaap_IncomeTaxReconciliationNondeductibleExpenseRestructuringCharges" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_IncomeTaxReconciliationTaxLawChanges" xlink:href="idt-20200731.xsd#idt_IncomeTaxReconciliationTaxLawChanges"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfUSFederalStatutoryIncomeTaxRateAndIncomeTaxesProvidedAbstract" xlink:to="idt_IncomeTaxReconciliationTaxLawChanges" order="7" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfUSFederalStatutoryIncomeTaxRateAndIncomeTaxesProvidedAbstract" xlink:to="us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes" order="8" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_IncomeTaxExpenseBenefit" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfUSFederalStatutoryIncomeTaxRateAndIncomeTaxesProvidedAbstract" xlink:to="us-gaap_IncomeTaxExpenseBenefit" order="9" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofchangeinthevaluationallowanceTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfChangeInTheValuationAllowanceAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfChangeInTheValuationAllowanceAbstract"/> |
| | <loc xlink:type="locator" xlink:label="idt_a2020Abstract0" xlink:href="idt-20200731.xsd#idt_a2020Abstract0"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfChangeInTheValuationAllowanceAbstract" xlink:to="idt_a2020Abstract0" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DeferredTaxAssetsValuationAllowance" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_a2020Abstract0" xlink:to="us-gaap_DeferredTaxAssetsValuationAllowance" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_a2020Abstract0" xlink:to="us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ValuationAllowancesAndReservesDeductions" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDeductions"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_a2020Abstract0" xlink:to="us-gaap_ValuationAllowancesAndReservesDeductions" order="2" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofstockoptionactivityTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfStockOptionActivityAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfStockOptionActivityAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfStockOptionActivityAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfStockOptionActivityAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfStockOptionActivityAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfStockOptionActivityAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfStockOptionActivityAbstract" xlink:to="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfStockOptionActivityAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfStockOptionActivityAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfStockOptionActivityAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice" order="7" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfStockOptionActivityAbstract" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" order="8" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfStockOptionActivityAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" order="9" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfStockOptionActivityAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" order="10" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfStockOptionActivityAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" order="11" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfStockOptionActivityAbstract" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" order="12" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfStockOptionActivityAbstract" xlink:to="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" order="13" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofgrantsofrestrictedsharesofClassBcommonstockTable"> |
| | <loc xlink:type="locator" xlink:label="idt_StockBasedCompensationDetailsScheduleofgrantsofrestrictedsharesofClassBcommonstockLineItems" xlink:href="idt-20200731.xsd#idt_StockBasedCompensationDetailsScheduleofgrantsofrestrictedsharesofClassBcommonstockLineItems"/> |
| | <loc xlink:type="locator" xlink:label="idt_StockBasedCompensationDetailsScheduleofgrantsofrestrictedsharesofClassBcommonstockTable" xlink:href="idt-20200731.xsd#idt_StockBasedCompensationDetailsScheduleofgrantsofrestrictedsharesofClassBcommonstockTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="idt_StockBasedCompensationDetailsScheduleofgrantsofrestrictedsharesofClassBcommonstockLineItems" xlink:to="idt_StockBasedCompensationDetailsScheduleofgrantsofrestrictedsharesofClassBcommonstockTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementClassOfStockAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementClassOfStockAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_StockBasedCompensationDetailsScheduleofgrantsofrestrictedsharesofClassBcommonstockTable" xlink:to="us-gaap_StatementClassOfStockAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CommonClassBMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonClassBMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="us-gaap_CommonClassBMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_StockBasedCompensationDetailsScheduleofgrantsofrestrictedsharesofClassBcommonstockLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_StockBasedCompensationDetailsScheduleofgrantsofrestrictedsharesofClassBcommonstockLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_StockBasedCompensationDetailsScheduleofgrantsofrestrictedsharesofClassBcommonstockLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_StockBasedCompensationDetailsScheduleofgrantsofrestrictedsharesofClassBcommonstockLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_StockBasedCompensationDetailsScheduleofgrantsofrestrictedsharesofClassBcommonstockLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_StockBasedCompensationDetailsScheduleofgrantsofrestrictedsharesofClassBcommonstockLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_StockBasedCompensationDetailsScheduleofgrantsofrestrictedsharesofClassBcommonstockLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" order="7" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_StockBasedCompensationDetailsScheduleofgrantsofrestrictedsharesofClassBcommonstockLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" order="8" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofgrantsofrestrictedsharesTable"> |
| | <loc xlink:type="locator" xlink:label="idt_ScheduleOfGrantsOfRestrictedSharesAbstract" xlink:href="idt-20200731.xsd#idt_ScheduleOfGrantsOfRestrictedSharesAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfGrantsOfRestrictedSharesAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfGrantsOfRestrictedSharesAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfGrantsOfRestrictedSharesAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfGrantsOfRestrictedSharesAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfGrantsOfRestrictedSharesAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfGrantsOfRestrictedSharesAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfGrantsOfRestrictedSharesAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_ScheduleOfGrantsOfRestrictedSharesAbstract" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" order="7" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofaccumulatedbalancesforeachclassificationofothercomprehensivelossTable"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:to="us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementEquityComponentsAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:to="us-gaap_StatementEquityComponentsAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EquityComponentDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EquityComponentDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AccumulatedTranslationAdjustmentMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_AccumulatedTranslationAdjustmentMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_AccumulatedOtherComprehensiveMember" xlink:href="idt-20200731.xsd#idt_AccumulatedOtherComprehensiveMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="idt_AccumulatedOtherComprehensiveMember" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:to="us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_AdjustmentFromTheAdoptionOfChangeInAccountingForEquityInvestments" xlink:href="idt-20200731.xsd#idt_AdjustmentFromTheAdoptionOfChangeInAccountingForEquityInvestments"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:to="idt_AdjustmentFromTheAdoptionOfChangeInAccountingForEquityInvestments" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAdjusted" xlink:href="idt-20200731.xsd#idt_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAdjusted"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:to="idt_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAdjusted" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:to="us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax" order="4" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofoperatingresultsofbusinesssegmentsTable"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SegmentReportingInformationLineItems" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentReportingInformationLineItems"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementBusinessSegmentsAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:to="us-gaap_StatementBusinessSegmentsAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SegmentDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementBusinessSegmentsAxis" xlink:to="us-gaap_SegmentDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SegmentDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementBusinessSegmentsAxis" xlink:to="us-gaap_SegmentDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_ConsolidationItemsAxis" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidationItemsAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:to="srt_ConsolidationItemsAxis" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_ConsolidationItemsDomain" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidationItemsDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_ConsolidationItemsAxis" xlink:to="srt_ConsolidationItemsDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_ConsolidationItemsDomain_0" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidationItemsDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_ConsolidationItemsAxis" xlink:to="srt_ConsolidationItemsDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingSegmentsMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingSegmentsMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ConsolidationItemsDomain" xlink:to="us-gaap_OperatingSegmentsMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_TelecomAndPaymentServicesMember" xlink:href="idt-20200731.xsd#idt_TelecomAndPaymentServicesMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentDomain" xlink:to="idt_TelecomAndPaymentServicesMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_Net2phoneMember" xlink:href="idt-20200731.xsd#idt_Net2phoneMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentDomain" xlink:to="idt_Net2phoneMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CorporateMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CorporateMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentDomain" xlink:to="us-gaap_CorporateMember" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_Revenues" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Revenues"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_Revenues" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingIncomeLoss" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingIncomeLoss"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_OperatingIncomeLoss" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DepreciationAndAmortization" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DepreciationAndAmortization"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_DepreciationAndAmortization" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SeveranceCosts1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SeveranceCosts1"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_SeveranceCosts1" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OtherOperatingIncomeExpenseNet" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherOperatingIncomeExpenseNet"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="us-gaap_OtherOperatingIncomeExpenseNet" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_YearEndedJuly312019Abstract0" xlink:href="idt-20200731.xsd#idt_YearEndedJuly312019Abstract0"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingInformationLineItems" xlink:to="idt_YearEndedJuly312019Abstract0" order="6" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/ScheduleofnetlonglivedassetsandtotalassetsbygeographicareasTable"> |
| | <loc xlink:type="locator" xlink:label="idt_BusinessSegmentInformationDetailsScheduleofnetlonglivedassetsandtotalassetsbygeographicareasLineItems" xlink:href="idt-20200731.xsd#idt_BusinessSegmentInformationDetailsScheduleofnetlonglivedassetsandtotalassetsbygeographicareasLineItems"/> |
| | <loc xlink:type="locator" xlink:label="idt_BusinessSegmentInformationDetailsScheduleofnetlonglivedassetsandtotalassetsbygeographicareasTable" xlink:href="idt-20200731.xsd#idt_BusinessSegmentInformationDetailsScheduleofnetlonglivedassetsandtotalassetsbygeographicareasTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="idt_BusinessSegmentInformationDetailsScheduleofnetlonglivedassetsandtotalassetsbygeographicareasLineItems" xlink:to="idt_BusinessSegmentInformationDetailsScheduleofnetlonglivedassetsandtotalassetsbygeographicareasTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_StatementGeographicalAxis" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_StatementGeographicalAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_BusinessSegmentInformationDetailsScheduleofnetlonglivedassetsandtotalassetsbygeographicareasTable" xlink:to="srt_StatementGeographicalAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_SegmentGeographicalDomain" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_SegmentGeographicalDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_StatementGeographicalAxis" xlink:to="srt_SegmentGeographicalDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_SegmentGeographicalDomain_0" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_SegmentGeographicalDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_StatementGeographicalAxis" xlink:to="srt_SegmentGeographicalDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="country_US" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_US"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_SegmentGeographicalDomain" xlink:to="country_US" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_ForeignCountrieMember" xlink:href="idt-20200731.xsd#idt_ForeignCountrieMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_SegmentGeographicalDomain" xlink:to="idt_ForeignCountrieMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_NoncurrentAssets" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoncurrentAssets"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_BusinessSegmentInformationDetailsScheduleofnetlonglivedassetsandtotalassetsbygeographicareasLineItems" xlink:to="us-gaap_NoncurrentAssets" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_Assets" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Assets"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_BusinessSegmentInformationDetailsScheduleofnetlonglivedassetsandtotalassetsbygeographicareasLineItems" xlink:to="us-gaap_Assets" order="2" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/DescriptionofBusinessandSummaryofSignificantAccountingPoliciesDetails"> |
| | <loc xlink:type="locator" xlink:label="idt_DescriptionofBusinessandSummaryofSignificantAccountingPoliciesDetailsLineItems" xlink:href="idt-20200731.xsd#idt_DescriptionofBusinessandSummaryofSignificantAccountingPoliciesDetailsLineItems"/> |
| | <loc xlink:type="locator" xlink:label="idt_DescriptionofBusinessandSummaryofSignificantAccountingPoliciesDetailsTable" xlink:href="idt-20200731.xsd#idt_DescriptionofBusinessandSummaryofSignificantAccountingPoliciesDetailsTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="idt_DescriptionofBusinessandSummaryofSignificantAccountingPoliciesDetailsLineItems" xlink:to="idt_DescriptionofBusinessandSummaryofSignificantAccountingPoliciesDetailsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_DescriptionofBusinessandSummaryofSignificantAccountingPoliciesDetailsTable" xlink:to="us-gaap_PropertyPlantAndEquipmentByTypeAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:to="us-gaap_PropertyPlantAndEquipmentTypeDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PropertyPlantAndEquipmentTypeDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:to="us-gaap_PropertyPlantAndEquipmentTypeDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_DescriptionofBusinessandSummaryofSignificantAccountingPoliciesDetailsTable" xlink:to="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_RangeAxis" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_DescriptionofBusinessandSummaryofSignificantAccountingPoliciesDetailsTable" xlink:to="srt_RangeAxis" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_RangeMember" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_RangeAxis" xlink:to="srt_RangeMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_RangeMember_0" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_RangeAxis" xlink:to="srt_RangeMember_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_DescriptionofBusinessandSummaryofSignificantAccountingPoliciesDetailsTable" xlink:to="us-gaap_ConcentrationRiskByBenchmarkAxis" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ConcentrationRiskBenchmarkDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:to="us-gaap_ConcentrationRiskBenchmarkDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ConcentrationRiskBenchmarkDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:to="us-gaap_ConcentrationRiskBenchmarkDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EquipmentMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquipmentMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="us-gaap_EquipmentMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_ComputerSoftwareMember" xlink:href="idt-20200731.xsd#idt_ComputerSoftwareMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="idt_ComputerSoftwareMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FurnitureAndFixturesMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FurnitureAndFixturesMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="us-gaap_FurnitureAndFixturesMember" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SoftwareAndSoftwareDevelopmentCostsMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SoftwareAndSoftwareDevelopmentCostsMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:to="us-gaap_SoftwareAndSoftwareDevelopmentCostsMember" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_MinimumMember" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RangeMember" xlink:to="srt_MinimumMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_MaximumMember" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_RangeMember" xlink:to="srt_MaximumMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CustomerListsMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CustomerListsMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:to="us-gaap_CustomerListsMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SalesRevenueNetMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesRevenueNetMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ConcentrationRiskBenchmarkDomain" xlink:to="us-gaap_SalesRevenueNetMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AccountsReceivableMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsReceivableMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ConcentrationRiskBenchmarkDomain" xlink:to="us-gaap_AccountsReceivableMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_NumberOfReportableSegments" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NumberOfReportableSegments"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DescriptionofBusinessandSummaryofSignificantAccountingPoliciesDetailsLineItems" xlink:to="us-gaap_NumberOfReportableSegments" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_CashAndCashEquivalentsSubstantiallyRestricted" xlink:href="idt-20200731.xsd#idt_CashAndCashEquivalentsSubstantiallyRestricted"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DescriptionofBusinessandSummaryofSignificantAccountingPoliciesDetailsLineItems" xlink:to="idt_CashAndCashEquivalentsSubstantiallyRestricted" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DescriptionofBusinessandSummaryofSignificantAccountingPoliciesDetailsLineItems" xlink:to="us-gaap_PropertyPlantAndEquipmentUsefulLife" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AdvertisingExpense" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdvertisingExpense"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DescriptionofBusinessandSummaryofSignificantAccountingPoliciesDetailsLineItems" xlink:to="us-gaap_AdvertisingExpense" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_InternalUseSoftwarePolicyDescription" xlink:href="idt-20200731.xsd#idt_InternalUseSoftwarePolicyDescription"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DescriptionofBusinessandSummaryofSignificantAccountingPoliciesDetailsLineItems" xlink:to="idt_InternalUseSoftwarePolicyDescription" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CapitalizedComputerSoftwareAmortization1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalizedComputerSoftwareAmortization1"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DescriptionofBusinessandSummaryofSignificantAccountingPoliciesDetailsLineItems" xlink:to="us-gaap_CapitalizedComputerSoftwareAmortization1" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CapitalizedComputerSoftwareNet" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalizedComputerSoftwareNet"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DescriptionofBusinessandSummaryofSignificantAccountingPoliciesDetailsLineItems" xlink:to="us-gaap_CapitalizedComputerSoftwareNet" order="7" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_IncomeTaxUncertaintiesPolicyLargestAmountOfBenefitGreaterThanPercentage" xlink:href="idt-20200731.xsd#idt_IncomeTaxUncertaintiesPolicyLargestAmountOfBenefitGreaterThanPercentage"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DescriptionofBusinessandSummaryofSignificantAccountingPoliciesDetailsLineItems" xlink:to="idt_IncomeTaxUncertaintiesPolicyLargestAmountOfBenefitGreaterThanPercentage" order="8" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_NumberOfCustomers" xlink:href="idt-20200731.xsd#idt_NumberOfCustomers"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DescriptionofBusinessandSummaryofSignificantAccountingPoliciesDetailsLineItems" xlink:to="idt_NumberOfCustomers" order="9" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ConcentrationRiskPercentage1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConcentrationRiskPercentage1"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_DescriptionofBusinessandSummaryofSignificantAccountingPoliciesDetailsLineItems" xlink:to="us-gaap_ConcentrationRiskPercentage1" order="10" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/RevenueRecognitionDetails"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RevenueFromContractWithCustomerAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CumulativeEarningsDeficit" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CumulativeEarningsDeficit"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RevenueFromContractWithCustomerAbstract" xlink:to="us-gaap_CumulativeEarningsDeficit" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ContractWithCustomerLiabilityRevenueRecognized" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RevenueFromContractWithCustomerAbstract" xlink:to="us-gaap_ContractWithCustomerLiabilityRevenueRecognized" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CapitalizedContractCostAmortization" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalizedContractCostAmortization"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RevenueFromContractWithCustomerAbstract" xlink:to="us-gaap_CapitalizedContractCostAmortization" order="2" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/LeasesDetails"> |
| | <loc xlink:type="locator" xlink:label="idt_LeasesDetailsLineItems" xlink:href="idt-20200731.xsd#idt_LeasesDetailsLineItems"/> |
| | <loc xlink:type="locator" xlink:label="idt_LeasesDetailsTable" xlink:href="idt-20200731.xsd#idt_LeasesDetailsTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="idt_LeasesDetailsLineItems" xlink:to="idt_LeasesDetailsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_LeasesDetailsTable" xlink:to="us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_TypeOfAdoptionMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TypeOfAdoptionMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:to="us-gaap_TypeOfAdoptionMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_TypeOfAdoptionMember_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TypeOfAdoptionMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:to="us-gaap_TypeOfAdoptionMember_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_LeasesDetailsTable" xlink:to="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RelatedPartyDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RelatedPartyDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_GeographicDistributionAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GeographicDistributionAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_LeasesDetailsTable" xlink:to="us-gaap_GeographicDistributionAxis" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_GeographicDistributionDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GeographicDistributionDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_GeographicDistributionAxis" xlink:to="us-gaap_GeographicDistributionDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_GeographicDistributionDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GeographicDistributionDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_GeographicDistributionAxis" xlink:to="us-gaap_GeographicDistributionDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AccountingStandardsUpdate201602Member" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountingStandardsUpdate201602Member"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_TypeOfAdoptionMember" xlink:to="us-gaap_AccountingStandardsUpdate201602Member" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_RafaelHoldingsIncMember" xlink:href="idt-20200731.xsd#idt_RafaelHoldingsIncMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="idt_RafaelHoldingsIncMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_NewarkMember" xlink:href="idt-20200731.xsd#idt_NewarkMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_GeographicDistributionDomain" xlink:to="idt_NewarkMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionsQuantification" xlink:href="idt-20200731.xsd#idt_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionsQuantification"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_LeasesDetailsLineItems" xlink:to="idt_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionsQuantification" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_LeaseTermDescription" xlink:href="idt-20200731.xsd#idt_LeaseTermDescription"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_LeasesDetailsLineItems" xlink:to="idt_LeaseTermDescription" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LeaseAndRentalExpense" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseAndRentalExpense"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_LeasesDetailsLineItems" xlink:to="us-gaap_LeaseAndRentalExpense" order="3" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/CashCashEquivalentsandRestrictedCashandCashEquivalentsDetails"> |
| | <loc xlink:type="locator" xlink:label="idt_CashCashEquivalentsandRestrictedCashandCashEquivalentsDetailsLineItems" xlink:href="idt-20200731.xsd#idt_CashCashEquivalentsandRestrictedCashandCashEquivalentsDetailsLineItems"/> |
| | <loc xlink:type="locator" xlink:label="idt_CashCashEquivalentsandRestrictedCashandCashEquivalentsDetailsTable" xlink:href="idt-20200731.xsd#idt_CashCashEquivalentsandRestrictedCashandCashEquivalentsDetailsTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="idt_CashCashEquivalentsandRestrictedCashandCashEquivalentsDetailsLineItems" xlink:to="idt_CashCashEquivalentsandRestrictedCashandCashEquivalentsDetailsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_ProductOrServiceAxis" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductOrServiceAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_CashCashEquivalentsandRestrictedCashandCashEquivalentsDetailsTable" xlink:to="srt_ProductOrServiceAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_ProductsAndServicesDomain" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductsAndServicesDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_ProductOrServiceAxis" xlink:to="srt_ProductsAndServicesDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_ProductsAndServicesDomain_0" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductsAndServicesDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_ProductOrServiceAxis" xlink:to="srt_ProductsAndServicesDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_IDTFinancialServicesLimitedMember" xlink:href="idt-20200731.xsd#idt_IDTFinancialServicesLimitedMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ProductsAndServicesDomain" xlink:to="idt_IDTFinancialServicesLimitedMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_CashCashEquivalentsandRestrictedCashandCashEquivalentsDetailsLineItems" xlink:to="us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue" order="1" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/AcquisitionsDetails"> |
| | <loc xlink:type="locator" xlink:label="idt_AcquisitionsDetailsLineItems" xlink:href="idt-20200731.xsd#idt_AcquisitionsDetailsLineItems"/> |
| | <loc xlink:type="locator" xlink:label="idt_AcquisitionsDetailsTable" xlink:href="idt-20200731.xsd#idt_AcquisitionsDetailsTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="idt_AcquisitionsDetailsLineItems" xlink:to="idt_AcquisitionsDetailsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessAcquisitionAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_AcquisitionsDetailsTable" xlink:to="us-gaap_BusinessAcquisitionAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_BusinessAcquisitionAxis" xlink:to="us-gaap_BusinessAcquisitionAcquireeDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_BusinessAcquisitionAxis" xlink:to="us-gaap_BusinessAcquisitionAcquireeDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_VersatureCorpMember" xlink:href="idt-20200731.xsd#idt_VersatureCorpMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_BusinessAcquisitionAcquireeDomain" xlink:to="idt_VersatureCorpMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_AcquisitionsDetailsLineItems" xlink:to="us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_BusinessCombinationContingentConsiderationArrangementsDescription" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsDescription"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_AcquisitionsDetailsLineItems" xlink:to="us-gaap_BusinessCombinationContingentConsiderationArrangementsDescription" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PaymentsToAcquireBusinessesGross" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_AcquisitionsDetailsLineItems" xlink:to="us-gaap_PaymentsToAcquireBusinessesGross" order="3" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/DebtSecuritiesDetails"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract" xlink:to="us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AvailableForSaleSecuritiesGrossRealizedGains" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AvailableForSaleSecuritiesGrossRealizedGains"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract" xlink:to="us-gaap_AvailableForSaleSecuritiesGrossRealizedGains" order="1" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/EquityInvestmentsDetails"> |
| | <loc xlink:type="locator" xlink:label="idt_EquityInvestmentsDetailsLineItems" xlink:href="idt-20200731.xsd#idt_EquityInvestmentsDetailsLineItems"/> |
| | <loc xlink:type="locator" xlink:label="idt_EquityInvestmentsDetailsTable" xlink:href="idt-20200731.xsd#idt_EquityInvestmentsDetailsTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="idt_EquityInvestmentsDetailsLineItems" xlink:to="idt_EquityInvestmentsDetailsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementClassOfStockAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementClassOfStockAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_EquityInvestmentsDetailsTable" xlink:to="us-gaap_StatementClassOfStockAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementEquityComponentsAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_EquityInvestmentsDetailsTable" xlink:to="us-gaap_StatementEquityComponentsAxis" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EquityComponentDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EquityComponentDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SubsequentEventTypeAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_EquityInvestmentsDetailsTable" xlink:to="us-gaap_SubsequentEventTypeAxis" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SubsequentEventTypeDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_SubsequentEventTypeAxis" xlink:to="us-gaap_SubsequentEventTypeDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SubsequentEventTypeDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_SubsequentEventTypeAxis" xlink:to="us-gaap_SubsequentEventTypeDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AwardDateAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AwardDateAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_EquityInvestmentsDetailsTable" xlink:to="us-gaap_AwardDateAxis" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AwardDateDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AwardDateDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_AwardDateAxis" xlink:to="us-gaap_AwardDateDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AwardDateDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AwardDateDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_AwardDateAxis" xlink:to="us-gaap_AwardDateDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_VisaSeriesCConvertibleParticipatingPreferredStockMember" xlink:href="idt-20200731.xsd#idt_VisaSeriesCConvertibleParticipatingPreferredStockMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="idt_VisaSeriesCConvertibleParticipatingPreferredStockMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_VisaSeriesAConvertibleParticipatingPreferredStockMember" xlink:href="idt-20200731.xsd#idt_VisaSeriesAConvertibleParticipatingPreferredStockMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="idt_VisaSeriesAConvertibleParticipatingPreferredStockMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_AccumulatedOtherComprehensiveIncomeMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RetainedEarningsMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_RetainedEarningsMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_VisaClassACommonStockMember" xlink:href="idt-20200731.xsd#idt_VisaClassACommonStockMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="idt_VisaClassACommonStockMember" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_AugustFirstTwoThousandEighteenMember" xlink:href="idt-20200731.xsd#idt_AugustFirstTwoThousandEighteenMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AwardDateDomain" xlink:to="idt_AugustFirstTwoThousandEighteenMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SubsequentEventMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SubsequentEventTypeDomain" xlink:to="us-gaap_SubsequentEventMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets3" xlink:href="idt-20200731.xsd#idt_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets3"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_EquityInvestmentsDetailsLineItems" xlink:to="idt_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets3" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_InvestmentOwnedBalanceShares" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentOwnedBalanceShares"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_EquityInvestmentsDetailsLineItems" xlink:to="us-gaap_InvestmentOwnedBalanceShares" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_EquityInvestmentsDetailsLineItems" xlink:to="us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LongTermInvestments" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermInvestments"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_EquityInvestmentsDetailsLineItems" xlink:to="us-gaap_LongTermInvestments" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_EquityInvestmentsDetailsLineItems" xlink:to="us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueUpwardPriceAdjustmentAnnualAmount" order="5" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/FairValueMeasurementsDetails"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FairValueDisclosuresAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueDisclosuresAbstract"/> |
| | <loc xlink:type="locator" xlink:label="idt_InvestmentInHedgeFunds" xlink:href="idt-20200731.xsd#idt_InvestmentInHedgeFunds"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueDisclosuresAbstract" xlink:to="idt_InvestmentInHedgeFunds" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/PropertyPlantandEquipmentDetails"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PropertyPlantAndEquipmentAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_Depreciation" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Depreciation"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_PropertyPlantAndEquipmentAbstract" xlink:to="us-gaap_Depreciation" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/OtherIntangibleAssetsDetails"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AmortizationOfIntangibleAssets" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:to="us-gaap_AmortizationOfIntangibleAssets" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:to="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:to="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:to="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:to="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract" xlink:to="us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive" order="5" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/OtherOperatingExpenseNetDetails"> |
| | <loc xlink:type="locator" xlink:label="idt_OtherOperatingExpenseNetDetailsLineItems" xlink:href="idt-20200731.xsd#idt_OtherOperatingExpenseNetDetailsLineItems"/> |
| | <loc xlink:type="locator" xlink:label="idt_OtherOperatingExpenseNetDetailsTable" xlink:href="idt-20200731.xsd#idt_OtherOperatingExpenseNetDetailsTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="idt_OtherOperatingExpenseNetDetailsLineItems" xlink:to="idt_OtherOperatingExpenseNetDetailsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_OtherOperatingExpenseNetDetailsTable" xlink:to="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RelatedPartyDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RelatedPartyDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_StraightPathMember" xlink:href="idt-20200731.xsd#idt_StraightPathMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="idt_StraightPathMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LegalFees" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LegalFees"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_OtherOperatingExpenseNetDetailsLineItems" xlink:to="us-gaap_LegalFees" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_UnusualOrInfrequentItemInsuranceProceeds" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnusualOrInfrequentItemInsuranceProceeds"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_OtherOperatingExpenseNetDetailsLineItems" xlink:to="us-gaap_UnusualOrInfrequentItemInsuranceProceeds" order="2" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/NotePayableandRevolvingCreditLoanPayableDetails"> |
| | <loc xlink:type="locator" xlink:label="idt_NotePayableAndRevolvingCreditFacilityAbstract" xlink:href="idt-20200731.xsd#idt_NotePayableAndRevolvingCreditFacilityAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ProceedsFromNotesPayable" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromNotesPayable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_NotePayableAndRevolvingCreditFacilityAbstract" xlink:to="us-gaap_ProceedsFromNotesPayable" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RepaymentsOfNotesPayable" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RepaymentsOfNotesPayable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_NotePayableAndRevolvingCreditFacilityAbstract" xlink:to="us-gaap_RepaymentsOfNotesPayable" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_NotePayableAndRevolvingCreditFacilityAbstract" xlink:to="us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_NotePayableAndRevolvingCreditFacilityAbstract" xlink:to="us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_NotePayableAndRevolvingCreditFacilityAbstract" xlink:to="us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" order="4" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/IncomeTaxesDetails"> |
| | <loc xlink:type="locator" xlink:label="idt_IncomeTaxesDetailsLineItems" xlink:href="idt-20200731.xsd#idt_IncomeTaxesDetailsLineItems"/> |
| | <loc xlink:type="locator" xlink:label="idt_IncomeTaxesDetailsTable" xlink:href="idt-20200731.xsd#idt_IncomeTaxesDetailsTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="idt_IncomeTaxesDetailsLineItems" xlink:to="idt_IncomeTaxesDetailsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_ConsolidatedEntitiesAxis" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidatedEntitiesAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_IncomeTaxesDetailsTable" xlink:to="srt_ConsolidatedEntitiesAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_ConsolidatedEntitiesDomain" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidatedEntitiesDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_ConsolidatedEntitiesAxis" xlink:to="srt_ConsolidatedEntitiesDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_ConsolidatedEntitiesDomain_0" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidatedEntitiesDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_ConsolidatedEntitiesAxis" xlink:to="srt_ConsolidatedEntitiesDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ValuationAllowancesAndReservesTypeAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ValuationAllowancesAndReservesTypeAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_IncomeTaxesDetailsTable" xlink:to="us-gaap_ValuationAllowancesAndReservesTypeAxis" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ValuationAllowancesAndReservesDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_ValuationAllowancesAndReservesTypeAxis" xlink:to="us-gaap_ValuationAllowancesAndReservesDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ValuationAllowancesAndReservesDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_ValuationAllowancesAndReservesTypeAxis" xlink:to="us-gaap_ValuationAllowancesAndReservesDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_SubsidiariesMember" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_SubsidiariesMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_ConsolidatedEntitiesDomain" xlink:to="srt_SubsidiariesMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_ValuationAllowanceUtilizedCurrentExpenseMember" xlink:href="idt-20200731.xsd#idt_ValuationAllowanceUtilizedCurrentExpenseMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ValuationAllowancesAndReservesDomain" xlink:to="idt_ValuationAllowanceUtilizedCurrentExpenseMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_ValuationAllowanceUtilizedFutureExpenseMember" xlink:href="idt-20200731.xsd#idt_ValuationAllowanceUtilizedFutureExpenseMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ValuationAllowancesAndReservesDomain" xlink:to="idt_ValuationAllowanceUtilizedFutureExpenseMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_UndistributedEarningsOfForeignSubsidiaries" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UndistributedEarningsOfForeignSubsidiaries"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_IncomeTaxesDetailsLineItems" xlink:to="us-gaap_UndistributedEarningsOfForeignSubsidiaries" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OperatingLossCarryforwards" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLossCarryforwards"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_IncomeTaxesDetailsLineItems" xlink:to="us-gaap_OperatingLossCarryforwards" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_ForeignNetOperatingLossCarryForwards" xlink:href="idt-20200731.xsd#idt_ForeignNetOperatingLossCarryForwards"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_IncomeTaxesDetailsLineItems" xlink:to="idt_ForeignNetOperatingLossCarryForwards" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_ForeignNetOperatingLossCarryForwardsNoExpiration" xlink:href="idt-20200731.xsd#idt_ForeignNetOperatingLossCarryForwardsNoExpiration"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_IncomeTaxesDetailsLineItems" xlink:to="idt_ForeignNetOperatingLossCarryForwardsNoExpiration" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_ForeignNetOperatingLossCarryForwardsExpirationTwoToTenYears" xlink:href="idt-20200731.xsd#idt_ForeignNetOperatingLossCarryForwardsExpirationTwoToTenYears"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_IncomeTaxesDetailsLineItems" xlink:to="idt_ForeignNetOperatingLossCarryForwardsExpirationTwoToTenYears" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_ForeignNetOperatingLossCarryForwardsExpirationTwentyYears" xlink:href="idt-20200731.xsd#idt_ForeignNetOperatingLossCarryForwardsExpirationTwentyYears"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_IncomeTaxesDetailsLineItems" xlink:to="idt_ForeignNetOperatingLossCarryForwardsExpirationTwentyYears" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_NetOperatingLossCarryForwardsYearOfExpiration" xlink:href="idt-20200731.xsd#idt_NetOperatingLossCarryForwardsYearOfExpiration"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_IncomeTaxesDetailsLineItems" xlink:to="idt_NetOperatingLossCarryForwardsYearOfExpiration" order="7" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_TotalSubsidiaryTaxNetOperatingLossCarryForwardsAnnualLimitAmountUnderInternalRevenueCode" xlink:href="idt-20200731.xsd#idt_TotalSubsidiaryTaxNetOperatingLossCarryForwardsAnnualLimitAmountUnderInternalRevenueCode"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_IncomeTaxesDetailsLineItems" xlink:to="idt_TotalSubsidiaryTaxNetOperatingLossCarryForwardsAnnualLimitAmountUnderInternalRevenueCode" order="8" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ValuationAllowancesAndReservesDeductions" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDeductions"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_IncomeTaxesDetailsLineItems" xlink:to="us-gaap_ValuationAllowancesAndReservesDeductions" order="9" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_TaxCreditCarryforwardAmount" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TaxCreditCarryforwardAmount"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_IncomeTaxesDetailsLineItems" xlink:to="us-gaap_TaxCreditCarryforwardAmount" order="10" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_TaxCreditCarryforwardDescription" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TaxCreditCarryforwardDescription"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_IncomeTaxesDetailsLineItems" xlink:to="us-gaap_TaxCreditCarryforwardDescription" order="11" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/EquityDetails"> |
| | <loc xlink:type="locator" xlink:label="idt_EquityDetailsLineItems" xlink:href="idt-20200731.xsd#idt_EquityDetailsLineItems"/> |
| | <loc xlink:type="locator" xlink:label="idt_EquityDetailsTable" xlink:href="idt-20200731.xsd#idt_EquityDetailsTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="idt_EquityDetailsLineItems" xlink:to="idt_EquityDetailsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementClassOfStockAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementClassOfStockAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_EquityDetailsTable" xlink:to="us-gaap_StatementClassOfStockAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareRepurchaseProgramAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareRepurchaseProgramAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_EquityDetailsTable" xlink:to="us-gaap_ShareRepurchaseProgramAxis" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareRepurchaseProgramDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareRepurchaseProgramDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_ShareRepurchaseProgramAxis" xlink:to="us-gaap_ShareRepurchaseProgramDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareRepurchaseProgramDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareRepurchaseProgramDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_ShareRepurchaseProgramAxis" xlink:to="us-gaap_ShareRepurchaseProgramDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_TitleOfIndividualAxis" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_TitleOfIndividualAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_EquityDetailsTable" xlink:to="srt_TitleOfIndividualAxis" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_TitleOfIndividualAxis" xlink:to="srt_TitleOfIndividualWithRelationshipToEntityDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_TitleOfIndividualWithRelationshipToEntityDomain_0" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_TitleOfIndividualAxis" xlink:to="srt_TitleOfIndividualWithRelationshipToEntityDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AwardTypeAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AwardTypeAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_EquityDetailsTable" xlink:to="us-gaap_AwardTypeAxis" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_AwardTypeAxis" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_AwardTypeAxis" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_EquityDetailsTable" xlink:to="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RelatedPartyDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RelatedPartyDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SubsequentEventTypeAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_EquityDetailsTable" xlink:to="us-gaap_SubsequentEventTypeAxis" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SubsequentEventTypeDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_SubsequentEventTypeAxis" xlink:to="us-gaap_SubsequentEventTypeDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SubsequentEventTypeDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_SubsequentEventTypeAxis" xlink:to="us-gaap_SubsequentEventTypeDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementEquityComponentsAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_EquityDetailsTable" xlink:to="us-gaap_StatementEquityComponentsAxis" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EquityComponentDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EquityComponentDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CommonClassBMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonClassBMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="us-gaap_CommonClassBMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_NoncontrollingInterestMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoncontrollingInterestMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="us-gaap_NoncontrollingInterestMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_HowardSJonasMember" xlink:href="idt-20200731.xsd#idt_HowardSJonasMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="idt_HowardSJonasMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_FiscaLTwentyTwentyOneMember" xlink:href="idt-20200731.xsd#idt_FiscaLTwentyTwentyOneMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="idt_FiscaLTwentyTwentyOneMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_EmployeesMember" xlink:href="idt-20200731.xsd#idt_EmployeesMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:to="idt_EmployeesMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_StockRepurchasesMember" xlink:href="idt-20200731.xsd#idt_StockRepurchasesMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareRepurchaseProgramDomain" xlink:to="idt_StockRepurchasesMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SubsequentEventMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SubsequentEventTypeDomain" xlink:to="us-gaap_SubsequentEventMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_TreasuryStockSharesAcquired" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TreasuryStockSharesAcquired"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_EquityDetailsLineItems" xlink:to="us-gaap_TreasuryStockSharesAcquired" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_MinorityInterestDecrease" xlink:href="idt-20200731.xsd#idt_MinorityInterestDecrease"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_EquityDetailsLineItems" xlink:to="idt_MinorityInterestDecrease" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_EquityDetailsLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_EquityDetailsLineItems" xlink:to="us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_StockIssuedDuringPeriodPricePerShareForTreasuryStockReissued" xlink:href="idt-20200731.xsd#idt_StockIssuedDuringPeriodPricePerShareForTreasuryStockReissued"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_EquityDetailsLineItems" xlink:to="idt_StockIssuedDuringPeriodPricePerShareForTreasuryStockReissued" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_EquityDetailsLineItems" xlink:to="us-gaap_ProceedsFromIssuanceOfCommonStock" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_ReductionToProceedsFromIssuanceOfCommonStock" xlink:href="idt-20200731.xsd#idt_ReductionToProceedsFromIssuanceOfCommonStock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_EquityDetailsLineItems" xlink:to="idt_ReductionToProceedsFromIssuanceOfCommonStock" order="7" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_EquityDetailsLineItems" xlink:to="us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction" order="8" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_EquityDetailsLineItems" xlink:to="us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased" order="9" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_TreasuryStockValueAcquiredCostMethod" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_EquityDetailsLineItems" xlink:to="us-gaap_TreasuryStockValueAcquiredCostMethod" order="10" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_EquityDetailsLineItems" xlink:to="us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased" order="11" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/StockBasedCompensationDetails"> |
| | <loc xlink:type="locator" xlink:label="idt_StockBasedCompensationDetailsLineItems" xlink:href="idt-20200731.xsd#idt_StockBasedCompensationDetailsLineItems"/> |
| | <loc xlink:type="locator" xlink:label="idt_StockBasedCompensationDetailsTable" xlink:href="idt-20200731.xsd#idt_StockBasedCompensationDetailsTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="idt_StockBasedCompensationDetailsLineItems" xlink:to="idt_StockBasedCompensationDetailsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementClassOfStockAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementClassOfStockAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_StockBasedCompensationDetailsTable" xlink:to="us-gaap_StatementClassOfStockAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementEquityComponentsAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_StockBasedCompensationDetailsTable" xlink:to="us-gaap_StatementEquityComponentsAxis" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EquityComponentDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EquityComponentDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementEquityComponentsAxis" xlink:to="us-gaap_EquityComponentDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AwardTypeAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AwardTypeAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_StockBasedCompensationDetailsTable" xlink:to="us-gaap_AwardTypeAxis" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_AwardTypeAxis" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_AwardTypeAxis" xlink:to="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SubsequentEventTypeAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_StockBasedCompensationDetailsTable" xlink:to="us-gaap_SubsequentEventTypeAxis" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SubsequentEventTypeDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_SubsequentEventTypeAxis" xlink:to="us-gaap_SubsequentEventTypeDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SubsequentEventTypeDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_SubsequentEventTypeAxis" xlink:to="us-gaap_SubsequentEventTypeDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CommonClassBMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonClassBMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="us-gaap_CommonClassBMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_OptionMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OptionMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="us-gaap_OptionMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RestrictedStockMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedStockMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="us-gaap_RestrictedStockMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_DeferredStockUnitsMember" xlink:href="idt-20200731.xsd#idt_DeferredStockUnitsMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="idt_DeferredStockUnitsMember" order="2" xbrldt:closed="true"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_EquityComponentDomain" xlink:to="idt_DeferredStockUnitsMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SubsequentEventMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SubsequentEventTypeDomain" xlink:to="us-gaap_SubsequentEventMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_StockBasedCompensationDetailsLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_StockBasedCompensationDetailsLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_StockBasedCompensationDetailsLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_StockBasedCompensationDetailsLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRights" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRights"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_StockBasedCompensationDetailsLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRights" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_StockBasedCompensationDetailsLineItems" xlink:to="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_StockBasedCompensationDetailsLineItems" xlink:to="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" order="7" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_StockBasedCompensationDetailsLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue" order="8" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDescription" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDescription"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_StockBasedCompensationDetailsLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDescription" order="9" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_StockBasedCompensationDetailsLineItems" xlink:to="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" order="10" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingDeferredInPeriod" xlink:href="idt-20200731.xsd#idt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingDeferredInPeriod"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_StockBasedCompensationDetailsLineItems" xlink:to="idt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingDeferredInPeriod" order="11" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_RestrictedEquityVestingConditionBusinessUnitFairValue" xlink:href="idt-20200731.xsd#idt_RestrictedEquityVestingConditionBusinessUnitFairValue"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_StockBasedCompensationDetailsLineItems" xlink:to="idt_RestrictedEquityVestingConditionBusinessUnitFairValue" order="12" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/CommitmentsandContingenciesDetails"> |
| | <loc xlink:type="locator" xlink:label="idt_CommitmentsandContingenciesDetailsLineItems" xlink:href="idt-20200731.xsd#idt_CommitmentsandContingenciesDetailsLineItems"/> |
| | <loc xlink:type="locator" xlink:label="idt_CommitmentsandContingenciesDetailsTable" xlink:href="idt-20200731.xsd#idt_CommitmentsandContingenciesDetailsTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="idt_CommitmentsandContingenciesDetailsLineItems" xlink:to="idt_CommitmentsandContingenciesDetailsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_LegalEntityAxis" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_LegalEntityAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_CommitmentsandContingenciesDetailsTable" xlink:to="dei_LegalEntityAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityDomain" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityDomain_0" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_TelecomOperatorMember" xlink:href="idt-20200731.xsd#idt_TelecomOperatorMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_EntityDomain" xlink:to="idt_TelecomOperatorMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_AccruedLiabilitiesCurrentAndNoncurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedLiabilitiesCurrentAndNoncurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_CommitmentsandContingenciesDetailsLineItems" xlink:to="us-gaap_AccruedLiabilitiesCurrentAndNoncurrent" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_PurchaseObligation" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PurchaseObligation"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_CommitmentsandContingenciesDetailsLineItems" xlink:to="us-gaap_PurchaseObligation" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_EscrowDeposit" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EscrowDeposit"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_CommitmentsandContingenciesDetailsLineItems" xlink:to="us-gaap_EscrowDeposit" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SecurityDeposit" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SecurityDeposit"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_CommitmentsandContingenciesDetailsLineItems" xlink:to="us-gaap_SecurityDeposit" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_PerformanceBondsOutstanding" xlink:href="idt-20200731.xsd#idt_PerformanceBondsOutstanding"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_CommitmentsandContingenciesDetailsLineItems" xlink:to="idt_PerformanceBondsOutstanding" order="5" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/RelatedPartyTransactionsDetails"> |
| | <loc xlink:type="locator" xlink:label="idt_RelatedPartyTransactionsDetailsLineItems" xlink:href="idt-20200731.xsd#idt_RelatedPartyTransactionsDetailsLineItems"/> |
| | <loc xlink:type="locator" xlink:label="idt_RelatedPartyTransactionsDetailsTable" xlink:href="idt-20200731.xsd#idt_RelatedPartyTransactionsDetailsTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="idt_RelatedPartyTransactionsDetailsLineItems" xlink:to="idt_RelatedPartyTransactionsDetailsTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_LitigationCaseAxis" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_LitigationCaseAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_RelatedPartyTransactionsDetailsTable" xlink:to="srt_LitigationCaseAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_LitigationCaseTypeDomain" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_LitigationCaseTypeDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="srt_LitigationCaseAxis" xlink:to="srt_LitigationCaseTypeDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="srt_LitigationCaseTypeDomain_0" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_LitigationCaseTypeDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="srt_LitigationCaseAxis" xlink:to="srt_LitigationCaseTypeDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_RelatedPartyTransactionsDetailsTable" xlink:to="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RelatedPartyDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RelatedPartyDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:to="us-gaap_RelatedPartyDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RelatedPartyTransactionAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_RelatedPartyTransactionsDetailsTable" xlink:to="us-gaap_RelatedPartyTransactionAxis" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RelatedPartyTransactionDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_RelatedPartyTransactionAxis" xlink:to="us-gaap_RelatedPartyTransactionDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RelatedPartyTransactionDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_RelatedPartyTransactionAxis" xlink:to="us-gaap_RelatedPartyTransactionDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SubsequentEventTypeAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="idt_RelatedPartyTransactionsDetailsTable" xlink:to="us-gaap_SubsequentEventTypeAxis" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SubsequentEventTypeDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_SubsequentEventTypeAxis" xlink:to="us-gaap_SubsequentEventTypeDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SubsequentEventTypeDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_SubsequentEventTypeAxis" xlink:to="us-gaap_SubsequentEventTypeDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_RafaelSpinOffMember" xlink:href="idt-20200731.xsd#idt_RafaelSpinOffMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="idt_RafaelSpinOffMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_JonasMember" xlink:href="idt-20200731.xsd#idt_JonasMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="idt_JonasMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_IgmBrokerageMember" xlink:href="idt-20200731.xsd#idt_IgmBrokerageMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyDomain" xlink:to="idt_IgmBrokerageMember" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_GenieAndSubsidiarieMember" xlink:href="idt-20200731.xsd#idt_GenieAndSubsidiarieMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="srt_LitigationCaseTypeDomain" xlink:to="idt_GenieAndSubsidiarieMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_ZedgeIncMember" xlink:href="idt-20200731.xsd#idt_ZedgeIncMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionDomain" xlink:to="idt_ZedgeIncMember" order="0" xbrldt:closed="true"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionDomain" xlink:to="idt_JonasMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_MasonAndCompanyConsultingMember" xlink:href="idt-20200731.xsd#idt_MasonAndCompanyConsultingMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RelatedPartyTransactionDomain" xlink:to="idt_MasonAndCompanyConsultingMember" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SubsequentEventMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SubsequentEventTypeDomain" xlink:to="us-gaap_SubsequentEventMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CostsAndExpensesRelatedParty" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CostsAndExpensesRelatedParty"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_RelatedPartyTransactionsDetailsLineItems" xlink:to="us-gaap_CostsAndExpensesRelatedParty" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_RelatedPartyTransactionsCashCollectedFromThirdPartyTenants" xlink:href="idt-20200731.xsd#idt_RelatedPartyTransactionsCashCollectedFromThirdPartyTenants"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_RelatedPartyTransactionsDetailsLineItems" xlink:to="idt_RelatedPartyTransactionsCashCollectedFromThirdPartyTenants" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DueFromOtherRelatedPartiesCurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DueFromOtherRelatedPartiesCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_RelatedPartyTransactionsDetailsLineItems" xlink:to="us-gaap_DueFromOtherRelatedPartiesCurrent" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_NumberOfRelatedPartySharesReceivesInConnectionWithRestrictedStock" xlink:href="idt-20200731.xsd#idt_NumberOfRelatedPartySharesReceivesInConnectionWithRestrictedStock"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_RelatedPartyTransactionsDetailsLineItems" xlink:to="idt_NumberOfRelatedPartySharesReceivesInConnectionWithRestrictedStock" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_RelatedPartyTransactionBillingsToRelatedPartyForServices" xlink:href="idt-20200731.xsd#idt_RelatedPartyTransactionBillingsToRelatedPartyForServices"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_RelatedPartyTransactionsDetailsLineItems" xlink:to="idt_RelatedPartyTransactionBillingsToRelatedPartyForServices" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_RelatedPartyTransactionBillingsAdjustmentToRelatedPartyForServices" xlink:href="idt-20200731.xsd#idt_RelatedPartyTransactionBillingsAdjustmentToRelatedPartyForServices"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_RelatedPartyTransactionsDetailsLineItems" xlink:to="idt_RelatedPartyTransactionBillingsAdjustmentToRelatedPartyForServices" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_RelatedPartyTransactionsDetailsLineItems" xlink:to="us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty" order="7" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_LeaseExpirationDescription" xlink:href="idt-20200731.xsd#idt_LeaseExpirationDescription"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_RelatedPartyTransactionsDetailsLineItems" xlink:to="idt_LeaseExpirationDescription" order="8" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_RelatedPartyTransactionLeaseAnnualRentPaymentsToRelatedParty" xlink:href="idt-20200731.xsd#idt_RelatedPartyTransactionLeaseAnnualRentPaymentsToRelatedParty"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_RelatedPartyTransactionsDetailsLineItems" xlink:to="idt_RelatedPartyTransactionLeaseAnnualRentPaymentsToRelatedParty" order="9" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DueFromEmployeesCurrent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DueFromEmployeesCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="idt_RelatedPartyTransactionsDetailsLineItems" xlink:to="us-gaap_DueFromEmployeesCurrent" order="10" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/DefinedContributionPlansDetails"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DisclosureTextBlockSupplementAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisclosureTextBlockSupplementAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DisclosureTextBlockSupplementAbstract" xlink:to="us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DisclosureTextBlockSupplementAbstract" xlink:to="us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_DefinedContributionPlanEmployerMatchingContributionLimitPercent" xlink:href="idt-20200731.xsd#idt_DefinedContributionPlanEmployerMatchingContributionLimitPercent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DisclosureTextBlockSupplementAbstract" xlink:to="idt_DefinedContributionPlanEmployerMatchingContributionLimitPercent" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="idt_DefinedContributionPlanEmployerDiscretionaryContributionVestingPeriod" xlink:href="idt-20200731.xsd#idt_DefinedContributionPlanEmployerDiscretionaryContributionVestingPeriod"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DisclosureTextBlockSupplementAbstract" xlink:to="idt_DefinedContributionPlanEmployerDiscretionaryContributionVestingPeriod" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_DefinedContributionPlanCostRecognized" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedContributionPlanCostRecognized"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_DisclosureTextBlockSupplementAbstract" xlink:to="us-gaap_DefinedContributionPlanCostRecognized" order="4" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/BusinessSegmentInformationDetails"> |
| | <loc xlink:type="locator" xlink:label="us-gaap_SegmentReportingAbstract" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentReportingAbstract"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_NumberOfReportableSegments" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NumberOfReportableSegments"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingAbstract" xlink:to="us-gaap_NumberOfReportableSegments" order="0" xbrldt:closed="true"/> |
| | </definitionLink> |
| <definitionLink xlink:type="extended" xlink:role="http://www.www.idt.net/role/DocumentAndEntityInformation"> |
| | <loc xlink:type="locator" xlink:label="dei_DocumentInformationLineItems" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentInformationLineItems"/> |
| | <loc xlink:type="locator" xlink:label="dei_DocumentInformationTable" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentInformationTable"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentInformationTable" order="0" xbrldt:contextElement="segment" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_StatementClassOfStockAxis" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementClassOfStockAxis"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="dei_DocumentInformationTable" xlink:to="us-gaap_StatementClassOfStockAxis" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_ClassOfStockDomain_0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_StatementClassOfStockAxis" xlink:to="us-gaap_ClassOfStockDomain_0" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CommonClassBMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonClassBMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="us-gaap_CommonClassBMember" order="0" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="us-gaap_CommonClassAMember" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonClassAMember"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ClassOfStockDomain" xlink:to="us-gaap_CommonClassAMember" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityRegistrantName" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityRegistrantName"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityRegistrantName" order="1" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_TradingSymbol" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_TradingSymbol"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_TradingSymbol" order="2" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_DocumentType" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentType"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentType" order="3" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_CurrentFiscalYearEndDate" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_CurrentFiscalYearEndDate"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_CurrentFiscalYearEndDate" order="4" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityCommonStockSharesOutstanding" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCommonStockSharesOutstanding"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityCommonStockSharesOutstanding" order="5" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityPublicFloat" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityPublicFloat"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityPublicFloat" order="6" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_AmendmentFlag" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_AmendmentFlag"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_AmendmentFlag" order="7" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityCentralIndexKey" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCentralIndexKey"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityCentralIndexKey" order="8" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityCurrentReportingStatus" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCurrentReportingStatus"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityCurrentReportingStatus" order="9" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityVoluntaryFilers" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityVoluntaryFilers"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityVoluntaryFilers" order="10" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityFilerCategory" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityFilerCategory"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityFilerCategory" order="11" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityWellKnownSeasonedIssuer" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityWellKnownSeasonedIssuer"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityWellKnownSeasonedIssuer" order="12" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_DocumentPeriodEndDate" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentPeriodEndDate"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentPeriodEndDate" order="13" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_DocumentFiscalYearFocus" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentFiscalYearFocus"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentFiscalYearFocus" order="14" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_DocumentFiscalPeriodFocus" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentFiscalPeriodFocus"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentFiscalPeriodFocus" order="15" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntitySmallBusiness" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntitySmallBusiness"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntitySmallBusiness" order="16" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityEmergingGrowthCompany" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityEmergingGrowthCompany"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityEmergingGrowthCompany" order="17" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityShellCompany" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityShellCompany"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityShellCompany" order="18" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_DocumentAnnualReport" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentAnnualReport"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentAnnualReport" order="19" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_DocumentTransitionReport" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentTransitionReport"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_DocumentTransitionReport" order="20" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityFileNumber" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityFileNumber"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityFileNumber" order="21" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityIncorporationStateCountryCode" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityIncorporationStateCountryCode"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityIncorporationStateCountryCode" order="22" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityTaxIdentificationNumber" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityTaxIdentificationNumber"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityTaxIdentificationNumber" order="23" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityAddressAddressLine1" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressAddressLine1"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityAddressAddressLine1" order="24" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityAddressCityOrTown" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressCityOrTown"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityAddressCityOrTown" order="25" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityAddressStateOrProvince" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressStateOrProvince"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityAddressStateOrProvince" order="26" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityAddressPostalZipCode" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressPostalZipCode"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityAddressPostalZipCode" order="27" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_CityAreaCode" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_CityAreaCode"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_CityAreaCode" order="28" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_LocalPhoneNumber" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_LocalPhoneNumber"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_LocalPhoneNumber" order="29" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_Security12gTitle" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_Security12gTitle"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_Security12gTitle" order="30" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_SecurityExchangeName" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_SecurityExchangeName"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_SecurityExchangeName" order="31" xbrldt:closed="true"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityInteractiveDataCurrent" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityInteractiveDataCurrent"/> |
| | <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="dei_DocumentInformationLineItems" xlink:to="dei_EntityInteractiveDataCurrent" order="32" xbrldt:closed="true"/> |
| | </definitionLink> |
| </linkbase> |