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| <link:definition> 020 - Disclosure - Other (Expense) Income, Net </link:definition> |
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| <link:definition> 025 - Disclosure - Fair Value Measurements (Tables) </link:definition> |
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| <link:definition> 049 - Disclosure - Business Segment Information (Details) </link:definition> |
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| <link:definition> 054 - Disclosure - Income Taxes (Details) </link:definition> |
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| | | <link:linkbaseRef xlink:type="simple" xlink:href="idt-20170131_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase"/> |
| | | <link:linkbaseRef xlink:type="simple" xlink:href="idt-20170131_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase"/> |
| | | <link:linkbaseRef xlink:type="simple" xlink:href="idt-20170131_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase"/> |
| | | <link:linkbaseRef xlink:type="simple" xlink:href="idt-20170131_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase"/> |
| | | </appinfo> |
| | </annotation> |
| <import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/> |
| <import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/> |
| <import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/> |
| <import namespace="http://fasb.org/us-gaap/2016-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2016/elts/us-gaap-2016-01-31.xsd"/> |
| <import namespace="http://xbrl.sec.gov/invest/2013-01-31" schemaLocation="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd"/> |
| <import namespace="http://xbrl.sec.gov/country/2016-01-31" schemaLocation="http://xbrl.sec.gov/country/2016/country-2016-01-31.xsd"/> |
| <import namespace="http://xbrl.sec.gov/currency/2016-01-31" schemaLocation="http://xbrl.sec.gov/currency/2016/currency-2016-01-31.xsd"/> |
| <import namespace="http://xbrl.sec.gov/exch/2016-01-31" schemaLocation="http://xbrl.sec.gov/exch/2016/exch-2016-01-31.xsd"/> |
| <import namespace="http://xbrl.sec.gov/naics/2011-01-31" schemaLocation="http://xbrl.sec.gov/naics/2011/naics-2011-01-31.xsd"/> |
| <import namespace="http://xbrl.sec.gov/sic/2011-01-31" schemaLocation="http://xbrl.sec.gov/sic/2011/sic-2011-01-31.xsd"/> |
| <import namespace="http://xbrl.sec.gov/stpr/2011-01-31" schemaLocation="http://xbrl.sec.gov/stpr/2011/stpr-2011-01-31.xsd"/> |
| <import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd"/> |
| <import namespace="http://www.xbrl.org/2009/role/net" schemaLocation="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd"/> |
| <import namespace="http://www.xbrl.org/2009/arcrole/fact-explanatoryFact" schemaLocation="http://www.xbrl.org/lrr/arcrole/factExplanatory-2009-12-16.xsd"/> |
| <import namespace="http://xbrl.sec.gov/dei/2014-01-31" schemaLocation="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd"/> |
| <import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd"/> |
| <import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd"/> |
| <import namespace="http://fasb.org/us-types/2016-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2016/elts/us-types-2016-01-31.xsd"/> |
| <element name="DocumentAndEntityInformationAbstract" id="idt_DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CashReceivedFromDivestitureOfInterestInConsolidatedSubsidiariesParentOnlyPortion" id="idt_CashReceivedFromDivestitureOfInterestInConsolidatedSubsidiariesParentOnlyPortion" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ReclassificationOfLiabilityForMemberInterestsInCsPharmaHoldingsLlc" id="idt_ReclassificationOfLiabilityForMemberInterestsInCsPharmaHoldingsLlc" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DispositionOfSubsidiaryAbstract" id="idt_DispositionOfSubsidiaryAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DispositionOfSubsidiaryTextBlock" id="idt_DispositionOfSubsidiaryTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RevolvingCreditLoanPayableAbstract" id="idt_RevolvingCreditLoanPayableAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="SeveranceExpenseAbstract" id="idt_SeveranceExpenseAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="SeveranceExpenseTextBlock" id="idt_SeveranceExpenseTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ZedgeMember" id="idt_ZedgeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItem" id="idt_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItem" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CornerstonePharmaceuticalsIncMember" id="idt_CornerstonePharmaceuticalsIncMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CsPharmaHoldingsMember" id="idt_CsPharmaHoldingsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ConvertiblePromissoryNoteMember" id="idt_ConvertiblePromissoryNoteMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="HowardAndDeborahJonasMember" id="idt_HowardAndDeborahJonasMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="HowardSAndDeborahJonasFoundationMember" id="idt_HowardSAndDeborahJonasFoundationMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="JonasMember" id="idt_JonasMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="InvestmentInCornerstonePharmaceuticalsIncTextualAbstract" id="idt_InvestmentInCornerstonePharmaceuticalsIncTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="InitialAmountOfInvestment" id="idt_InitialAmountOfInvestment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RemainingAmountOfInvestment" id="idt_RemainingAmountOfInvestment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="PurchaseSharesOfCapitalStock" id="idt_PurchaseSharesOfCapitalStock" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ExerciseWarrantsValue" id="idt_ExerciseWarrantsValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="InitialAmountOfInvestmentAmountsPaid" id="idt_InitialAmountOfInvestmentAmountsPaid" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="MaximumAmountToBeInvested" id="idt_MaximumAmountToBeInvested" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ProceedsFromIssuanceOfMemberInterests" id="idt_ProceedsFromIssuanceOfMemberInterests" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="OtherCurrentLiabilities" id="idt_OtherCurrentLiabilities" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ProceedsFromThirdPartyMemberInterestsDescription" id="idt_ProceedsFromThirdPartyMemberInterestsDescription" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="InvestmentWarrantsExerciseTermsAndExpiration" id="idt_InvestmentWarrantsExerciseTermsAndExpiration" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="PercentageOfDirectAndIndirectInterest" id="idt_PercentageOfDirectAndIndirectInterest" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="InternationalAgencyNotesMember" id="idt_InternationalAgencyNotesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="MutualFundsMember" id="idt_MutualFundsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="AvailableForSaleSecuritiesTotalGrossUnrealizedGains" id="idt_AvailableForSaleSecuritiesTotalGrossUnrealizedGains" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="AvailableForSaleSecuritiesTotalGrossUnrealizedLosses" id="idt_AvailableForSaleSecuritiesTotalGrossUnrealizedLosses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="MarketableSecuritiesTextualAbstract" id="idt_MarketableSecuritiesTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="NumberOfRelatedPartySharesReceivedInConnectionWithRestrictedStock" id="idt_NumberOfRelatedPartySharesReceivedInConnectionWithRestrictedStock" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="AmountPaidForRelatedPartySharesReceivedInConnectionWithRestrictedStock" id="idt_AmountPaidForRelatedPartySharesReceivedInConnectionWithRestrictedStock" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="FairValueMeasurementTextualAbstract" id="idt_FairValueMeasurementTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="InvestmentInHedgeFunds" id="idt_InvestmentInHedgeFunds" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RepurchaseOfRestrictedStock" id="idt_RepurchaseOfRestrictedStock" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DistributionToNoncontrollingInterests" id="idt_DistributionToNoncontrollingInterests" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="StockBasedCompensation" id="idt_StockBasedCompensation" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="EmployeeMember" id="idt_EmployeeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="JulyTwelveTwoThousandTwelveMember" id="idt_JulyTwelveTwoThousandTwelveMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="LineOfCreditCovenantMaximumAmountOfLoansAndAdvancesToAffiliatesOrSubsidiaries" id="idt_LineOfCreditCovenantMaximumAmountOfLoansAndAdvancesToAffiliatesOrSubsidiaries" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="InvestmentsInAndAdvancesToAffiliates" id="idt_InvestmentsInAndAdvancesToAffiliates" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="LineOfCreditUtilizedForLettersOfCreditOutstandingAmount" id="idt_LineOfCreditUtilizedForLettersOfCreditOutstandingAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="BasisPointsSpread" id="idt_BasisPointsSpread" type="xbrli:integerItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="WorkforceReductionMember" id="idt_WorkforceReductionMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="SeveranceExpenseTextualAbstract" id="idt_SeveranceExpenseTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="TelecomPlatformServicesMember" id="idt_TelecomPlatformServicesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="UnifiedCommunicationsAsServiceMember" id="idt_UnifiedCommunicationsAsServiceMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ConsumerPhoneServicesMember" id="idt_ConsumerPhoneServicesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="AllOtherMember" id="idt_AllOtherMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="BusinessSegmentInformationTextualsAbstract" id="idt_BusinessSegmentInformationTextualsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="IDTFinancialServicesCustomerDepositsMember" id="idt_IDTFinancialServicesCustomerDepositsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RelatedLettersOfCreditMember" id="idt_RelatedLettersOfCreditMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RestrictedOtherMember" id="idt_RestrictedOtherMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ExpirationDateOneMember" id="idt_ExpirationDateOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="IdtFinancialServicesLtdMember" id="idt_IdtFinancialServicesLtdMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="IdtPaymentServicesAndIdtFinancialServicesLtdMember" id="idt_IdtPaymentServicesAndIdtFinancialServicesLtdMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CommitmentsAndContingenciesTextualAbstract" id="idt_CommitmentsAndContingenciesTextualAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="LettersOfCreditExpirationDate" id="idt_LettersOfCreditExpirationDate" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="PerformanceBondsOutstanding" id="idt_PerformanceBondsOutstanding" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CashAndCashEquivalentsSubstantiallyRestricted" id="idt_CashAndCashEquivalentsSubstantiallyRestricted" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ElmionNetherlandsBvMember" id="idt_ElmionNetherlandsBvMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| </schema> |