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| <link:definition> 110 - Disclosure - Description of Business and Summary of Significant Accounting Policies </link:definition> |
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| <link:definition> 111 - Disclosure - Discontinued Operations </link:definition> |
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| <link:definition> 112 - Disclosure - Fair Value Measurements </link:definition> |
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| <link:definition> 113 - Disclosure - Property, Plant and Equipment </link:definition> |
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| <link:definition> 114 - Disclosure - Goodwill and Other Intangibles </link:definition> |
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| <link:definition> 115 - Disclosure - Other Operating (Losses) Gains, Net </link:definition> |
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| <link:definition> 116 - Disclosure - Notes Payable </link:definition> |
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| <link:definition> 117 - Disclosure - Other (Expense) Income, Net </link:definition> |
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| <link:definition> 118 - Disclosure - Income Taxes </link:definition> |
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| <link:definition> 119 - Disclosure - Equity </link:definition> |
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| <link:definition> 120 - Disclosure - Stock-Based Compensation </link:definition> |
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| <link:definition> 121 - Disclosure - Accumulated Other Comprehensive Income (Loss) </link:definition> |
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| <link:definition> 122 - Disclosure - Legal Proceedings </link:definition> |
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| <link:definition> 123 - Disclosure - Commitments and Contingencies </link:definition> |
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| <link:definition> 124 - Disclosure - Related Party Transactions </link:definition> |
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| <link:definition> 125 - Disclosure - Defined Contribution Plans </link:definition> |
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| <link:definition> 126 - Disclosure - Business Segment Information </link:definition> |
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| <link:definition> 127 - Disclosure - Selected Quarterly Financial Data (Unaudited) </link:definition> |
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| <link:definition> 128 - Disclosure - Description of Business and Summary of Significant Accounting Policies (Policies) </link:definition> |
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| <link:definition> 129 - Disclosure - Description of Business and Summary of Significant Accounting Policies (Tables) </link:definition> |
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| <link:definition> 130 - Disclosure - Discontinued Operations (Tables) </link:definition> |
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| <link:definition> 131 - Disclosure - Fair Value Measurements (Tables) </link:definition> |
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| <link:definition> 132 - Disclosure - Property, Plant and Equipment (Tables) </link:definition> |
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| <link:definition> 133 - Disclosure - Goodwill and Other Intangibles (Tables) </link:definition> |
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| <link:definition> 134 - Disclosure - Other Operating (Losses) Gains, Net (Tables) </link:definition> |
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| <link:definition> 135 - Disclosure - Notes Payable (Tables) </link:definition> |
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| <link:definition> 136 - Disclosure - Other (Expense) Income, Net (Tables) </link:definition> |
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| <link:definition> 137 - Disclosure - Income Taxes (Tables) </link:definition> |
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| <link:definition> 138 - Disclosure - Stock-Based Compensation (Tables) </link:definition> |
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| <link:definition> 139 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Tables) </link:definition> |
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| <link:definition> 140 - Disclosure - Commitments and Contingencies (Tables) </link:definition> |
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| <link:definition> 141 - Disclosure - Business Segment Information (Tables) </link:definition> |
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| <link:definition> 142 - Disclosure - Selected Quarterly Financial Data (Unaudited) (Tables) </link:definition> |
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| <link:definition> 143 - Disclosure - Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) </link:definition> |
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| <link:definition> 144 - Disclosure - Description of Business and Summary of Significant Accounting Policies - Summary of Weighted-Average Number of Shares used in Calculation of Basic and Diluted Earnings Per Share (Detail) </link:definition> |
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| <link:definition> 145 - Disclosure - Description of Business and Summary of Significant Accounting Policies - Summary of Outstanding Stock Options Excluded from Calculation of Diluted Earnings Per Share (Detail) </link:definition> |
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| <link:definition> 146 - Disclosure - Description of Business and Summary of Significant Accounting Policies - Summary of Change in Allowance for Doubtful Accounts (Detail) </link:definition> |
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| <link:definition> 147 - Disclosure - Discontinued Operations - Additional Information (Detail) </link:definition> |
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| <link:definition> 148 - Disclosure - Discontinued Operations - Summary Financial Data of Discontinued Operations (Detail) </link:definition> |
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| <link:definition> 149 - Disclosure - Discontinued Operations - Schedule of Assets and Liabilities of Discontinued Operations (Detail) </link:definition> |
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| <link:definition> 150 - Disclosure - Fair Value Measurements - Additional Information (Detail) </link:definition> |
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| <link:definition> 151 - Disclosure - Fair Value Measurements - Summary of Change in Company's Assets Measured at Fair Value on Recurring Basis (Detail) </link:definition> |
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| | | <link:roleType roleURI="http://www.idt.net/taxonomy/role/DisclosurePropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipment" id="DisclosurePropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipment"> |
| <link:definition> 152 - Disclosure - Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) </link:definition> |
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| | | <link:roleType roleURI="http://www.idt.net/taxonomy/role/DisclosurePropertyPlantAndEquipmentAdditionalInformation" id="DisclosurePropertyPlantAndEquipmentAdditionalInformation"> |
| <link:definition> 153 - Disclosure - Property, Plant and Equipment - Additional Information (Detail) </link:definition> |
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| <link:definition> 154 - Disclosure - Goodwill and Other Intangibles - Schedule of Change in Carrying Amount of Goodwill by Operating Segment (Detail) </link:definition> |
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| <link:definition> 155 - Disclosure - Goodwill and Other Intangibles - Schedule of Other Intangible Assets (Detail) </link:definition> |
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| | | <link:roleType roleURI="http://www.idt.net/taxonomy/role/DisclosureGoodwillAndOtherIntangiblesAdditionalInformation" id="DisclosureGoodwillAndOtherIntangiblesAdditionalInformation"> |
| <link:definition> 156 - Disclosure - Goodwill and Other Intangibles - Additional Information (Detail) </link:definition> |
| <link:usedOn> link:calculationLink </link:usedOn> |
| <link:usedOn> link:presentationLink </link:usedOn> |
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| | | <link:roleType roleURI="http://www.idt.net/taxonomy/role/DisclosureOtherOperatingLossesGainsNetSummaryOfOtherOperatingLossesGainsNetByBusinessSegment" id="DisclosureOtherOperatingLossesGainsNetSummaryOfOtherOperatingLossesGainsNetByBusinessSegment"> |
| <link:definition> 157 - Disclosure - Other Operating (Losses) Gains, Net - Summary of Other Operating (Losses) Gains, Net by Business Segment (Detail) </link:definition> |
| <link:usedOn> link:calculationLink </link:usedOn> |
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| | | <link:roleType roleURI="http://www.idt.net/taxonomy/role/DisclosureNotesPayableScheduleOfNotesPayable" id="DisclosureNotesPayableScheduleOfNotesPayable"> |
| <link:definition> 158 - Disclosure - Notes Payable - Schedule of Notes Payable (Detail) </link:definition> |
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| | | <link:roleType roleURI="http://www.idt.net/taxonomy/role/DisclosureNotesPayableScheduleOfNotesPayableParenthetical" id="DisclosureNotesPayableScheduleOfNotesPayableParenthetical"> |
| <link:definition> 159 - Disclosure - Notes Payable - Schedule of Notes Payable (Parenthetical) (Detail) </link:definition> |
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| <link:usedOn> link:presentationLink </link:usedOn> |
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| | | <link:roleType roleURI="http://www.idt.net/taxonomy/role/DisclosureNotesPayableScheduleOfEstimatedFuturePrincipalPaymentsOfNotesPayable" id="DisclosureNotesPayableScheduleOfEstimatedFuturePrincipalPaymentsOfNotesPayable"> |
| <link:definition> 160 - Disclosure - Notes Payable - Schedule of Estimated Future Principal Payments of Notes Payable (Detail) </link:definition> |
| <link:usedOn> link:calculationLink </link:usedOn> |
| <link:usedOn> link:presentationLink </link:usedOn> |
| <link:usedOn> link:definitionLink </link:usedOn> |
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| | | <link:roleType roleURI="http://www.idt.net/taxonomy/role/DisclosureOtherExpenseIncomeNetScheduleOfOtherIncomeExpenseNet" id="DisclosureOtherExpenseIncomeNetScheduleOfOtherIncomeExpenseNet"> |
| <link:definition> 161 - Disclosure - Other (Expense) Income, Net - Schedule of Other Income Expense Net (Detail) </link:definition> |
| <link:usedOn> link:calculationLink </link:usedOn> |
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| | | <link:roleType roleURI="http://www.idt.net/taxonomy/role/DisclosureOtherExpenseIncomeNetAdditionalInformation" id="DisclosureOtherExpenseIncomeNetAdditionalInformation"> |
| <link:definition> 162 - Disclosure - Other (Expense) Income, Net - Additional Information (Detail) </link:definition> |
| <link:usedOn> link:calculationLink </link:usedOn> |
| <link:usedOn> link:presentationLink </link:usedOn> |
| <link:usedOn> link:definitionLink </link:usedOn> |
| </link:roleType> |
| | | <link:roleType roleURI="http://www.idt.net/taxonomy/role/DisclosureIncomeTaxesScheduleOfIncomeLossFromContinuingOperationsBeforeIncomeTaxes" id="DisclosureIncomeTaxesScheduleOfIncomeLossFromContinuingOperationsBeforeIncomeTaxes"> |
| <link:definition> 163 - Disclosure - Income Taxes - Schedule of Income (Loss) from Continuing Operations Before Income Taxes (Detail) </link:definition> |
| <link:usedOn> link:calculationLink </link:usedOn> |
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| | | <link:roleType roleURI="http://www.idt.net/taxonomy/role/DisclosureIncomeTaxesScheduleOfDeferredIncomeTaxAssetsAndDeferredIncomeTaxLiabilities" id="DisclosureIncomeTaxesScheduleOfDeferredIncomeTaxAssetsAndDeferredIncomeTaxLiabilities"> |
| <link:definition> 164 - Disclosure - Income Taxes - Schedule of Deferred Income Tax Assets and Deferred Income Tax Liabilities (Detail) </link:definition> |
| <link:usedOn> link:calculationLink </link:usedOn> |
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| | | <link:roleType roleURI="http://www.idt.net/taxonomy/role/DisclosureIncomeTaxesScheduleOfBenefitFromIncomeTaxes" id="DisclosureIncomeTaxesScheduleOfBenefitFromIncomeTaxes"> |
| <link:definition> 165 - Disclosure - Income Taxes - Schedule of Benefit from Income Taxes (Detail) </link:definition> |
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| | | <link:roleType roleURI="http://www.idt.net/taxonomy/role/DisclosureIncomeTaxesAdditionalInformation" id="DisclosureIncomeTaxesAdditionalInformation"> |
| <link:definition> 166 - Disclosure - Income Taxes - Additional Information (Detail) </link:definition> |
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| <link:usedOn> link:presentationLink </link:usedOn> |
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| | | <link:roleType roleURI="http://www.idt.net/taxonomy/role/DisclosureIncomeTaxesScheduleOfStatutoryIncomeTaxRateAndIncomeTaxesProvided" id="DisclosureIncomeTaxesScheduleOfStatutoryIncomeTaxRateAndIncomeTaxesProvided"> |
| <link:definition> 167 - Disclosure - Income Taxes - Schedule of Statutory Income Tax Rate and Income Taxes Provided (Detail) </link:definition> |
| <link:usedOn> link:calculationLink </link:usedOn> |
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| | | <link:roleType roleURI="http://www.idt.net/taxonomy/role/DisclosureIncomeTaxesScheduleOfChangeInValuationAllowance" id="DisclosureIncomeTaxesScheduleOfChangeInValuationAllowance"> |
| <link:definition> 168 - Disclosure - Income Taxes - Schedule of Change in Valuation Allowance (Detail) </link:definition> |
| <link:usedOn> link:calculationLink </link:usedOn> |
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| | | <link:roleType roleURI="http://www.idt.net/taxonomy/role/DisclosureIncomeTaxesSummaryOfChangeInBalanceOfUnrecognizedIncomeTaxBenefits" id="DisclosureIncomeTaxesSummaryOfChangeInBalanceOfUnrecognizedIncomeTaxBenefits"> |
| <link:definition> 169 - Disclosure - Income Taxes - Summary of Change in Balance of Unrecognized Income Tax Benefits (Detail) </link:definition> |
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| | | <link:roleType roleURI="http://www.idt.net/taxonomy/role/DisclosureEquityAdditionalInformation" id="DisclosureEquityAdditionalInformation"> |
| <link:definition> 170 - Disclosure - Equity - Additional Information (Detail) </link:definition> |
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| | | <link:roleType roleURI="http://www.idt.net/taxonomy/role/DisclosureStockBasedCompensationAdditionalInformation" id="DisclosureStockBasedCompensationAdditionalInformation"> |
| <link:definition> 171 - Disclosure - Stock-Based Compensation - Additional Information (Detail) </link:definition> |
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| | | <link:roleType roleURI="http://www.idt.net/taxonomy/role/DisclosureStockBasedCompensationScheduleOfRiskFreeRateBasedOnUSTreasuryYieldCurveEffectAtTimeOfGrant" id="DisclosureStockBasedCompensationScheduleOfRiskFreeRateBasedOnUSTreasuryYieldCurveEffectAtTimeOfGrant"> |
| <link:definition> 172 - Disclosure - Stock-Based Compensation - Schedule of Risk Free Rate Based on U.S. Treasury Yield Curve Effect at Time of Grant (Detail) </link:definition> |
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| | | <link:roleType roleURI="http://www.idt.net/taxonomy/role/DisclosureStockBasedCompensationSummaryOfStockOptionActivity" id="DisclosureStockBasedCompensationSummaryOfStockOptionActivity"> |
| <link:definition> 173 - Disclosure - Stock-Based Compensation - Summary of Stock Option Activity (Detail) </link:definition> |
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| | | <link:roleType roleURI="http://www.idt.net/taxonomy/role/DisclosureStockBasedCompensationGrantsOfRestrictedSharesOfClassBCommonStock" id="DisclosureStockBasedCompensationGrantsOfRestrictedSharesOfClassBCommonStock"> |
| <link:definition> 174 - Disclosure - Stock-Based Compensation - Grants of Restricted Shares of Class B Common Stock (Detail) </link:definition> |
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| <link:definition> 175 - Disclosure - Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Balances for Each Classification of Other Comprehensive Income (Detail) </link:definition> |
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| <link:definition> 176 - Disclosure - Legal Proceedings - Additional Information (Detail) </link:definition> |
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| <link:definition> 177 - Disclosure - Commitments and Contingencies - Additional Information (Detail) </link:definition> |
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| <link:definition> 178 - Disclosure - Commitments and Contingencies - Future Minimum Payments for Operating Leases (Detail) </link:definition> |
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| <link:definition> 179 - Disclosure - Commitments and Contingencies - Restricted Cash and Cash Equivalents (Detail) </link:definition> |
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| <link:definition> 180 - Disclosure - Related Party Transactions - Additional Information (Detail) </link:definition> |
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| <link:definition> 181 - Disclosure - Defined Contribution Plans - Additional Information (Detail) </link:definition> |
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| <link:definition> 182 - Disclosure - Business Segment Information - Additional Information (Detail) </link:definition> |
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| <link:definition> 183 - Disclosure - Business Segment Information - Operating Results of Business Segments (Detail) </link:definition> |
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| <link:definition> 184 - Disclosure - Selected Quarterly Financial Data (Unaudited) - Summary of Selected Quarterly Financial Data (Detail) </link:definition> |
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| <link:definition> 185 - Statement - CONSOLIDATED STATEMENTS OF INCOME (Alternate 1) </link:definition> |
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| <element name="ActualPaymentReceivedUnderThirdPartyBankruptcySettlement" id="idt_ActualPaymentReceivedUnderThirdPartyBankruptcySettlement" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="AdjustmentsToAdditionalPaidInCapitalAndTreasuryStockOther" id="idt_AdjustmentsToAdditionalPaidInCapitalAndTreasuryStockOther" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" 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="AllowanceForDoubtfulAccountsPolicyTextBlock" id="idt_AllowanceForDoubtfulAccountsPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="AmortizationExpenseForIntangiblesAndOtherAssets" id="idt_AmortizationExpenseForIntangiblesAndOtherAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="AmountOfTaxAssessmentIncludingInterestAndPenalties" id="idt_AmountOfTaxAssessmentIncludingInterestAndPenalties" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="AssessmentOfTaxIncludingPenaltiesAndInterest" id="idt_AssessmentOfTaxIncludingPenaltiesAndInterest" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="AssetAcquisitionCashPaid" id="idt_AssetAcquisitionCashPaid" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="AssetsAtFairValueMember" id="idt_AssetsAtFairValueMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="AuctionRateSecurities" id="idt_AuctionRateSecurities" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="BasisOfConsolidationPolicyTextBlock" id="idt_BasisOfConsolidationPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" 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="BroadstripeLLCMember" id="idt_BroadstripeLLCMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CapitalLeasedAssetsAccumulatedDepreciation" id="idt_CapitalLeasedAssetsAccumulatedDepreciation" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CashReceivedUponTerminationOfContract" id="idt_CashReceivedUponTerminationOfContract" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CEOOfInnovativeCommunicationsTechnologiesIncMember" id="idt_CEOOfInnovativeCommunicationsTechnologiesIncMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CertainLoansAcquiredInTransferCashPaid" id="idt_CertainLoansAcquiredInTransferCashPaid" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CertainLoansAcquiredInTransferFaceAmount" id="idt_CertainLoansAcquiredInTransferFaceAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ChangesToCommonStockSharesReservedForStockOptionIncentivePlan" id="idt_ChangesToCommonStockSharesReservedForStockOptionIncentivePlan" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ChangesToSharesAvailableForFutureGrants" id="idt_ChangesToSharesAvailableForFutureGrants" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ClassaRestrictedCommonShareMember" id="idt_ClassaRestrictedCommonShareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ClassATreasuryStockPeriodDecreaseIncrease" id="idt_ClassATreasuryStockPeriodDecreaseIncrease" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CommitmentAndContingenciesLineItems" id="idt_CommitmentAndContingenciesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CommitmentAndContingenciesTable" id="idt_CommitmentAndContingenciesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/> |
| <element name="CommonStockSharesReservedForStockOptionIncentivePlan" id="idt_CommonStockSharesReservedForStockOptionIncentivePlan" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CompensationRelatedCostsShareBasedPaymentsDisclosureLineItems" id="idt_CompensationRelatedCostsShareBasedPaymentsDisclosureLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CompensationRelatedCostsShareBasedPaymentsDisclosureTable" id="idt_CompensationRelatedCostsShareBasedPaymentsDisclosureTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/> |
| <element name="ComputerSoftwareMember" id="idt_ComputerSoftwareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ConcentrationOfCreditRiskPolicyTextBlock" id="idt_ConcentrationOfCreditRiskPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ConnectivityLeaseRentalExpense" id="idt_ConnectivityLeaseRentalExpense" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" 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="ConversionOfClassACommonStockToClassBCommonStockShares" id="idt_ConversionOfClassACommonStockToClassBCommonStockShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ConversionOfExchangeableSharesIntoClassBCommonShares" id="idt_ConversionOfExchangeableSharesIntoClassBCommonShares" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ConversionOfExchangeableSharesIntoClassBCommonSharesAggregateSharesExchanged" id="idt_ConversionOfExchangeableSharesIntoClassBCommonSharesAggregateSharesExchanged" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CorporateOtherIncomeLoss" id="idt_CorporateOtherIncomeLoss" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CostOfRevenuePolicyTextBlock" id="idt_CostOfRevenuePolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CountryAxis" id="idt_CountryAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/> |
| <element name="CountryDomain" id="idt_CountryDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CTMHoldingsAndSubsidiariesMember" id="idt_CTMHoldingsAndSubsidiariesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="CustomerDepositsMember" id="idt_CustomerDepositsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DamagesAwardedToPlaintiffFinalJudgment" id="idt_DamagesAwardedToPlaintiffFinalJudgment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DamagesAwardedToPlaintiffPreJudgmentInterest" id="idt_DamagesAwardedToPlaintiffPreJudgmentInterest" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DebtInstrumentInterestAddedToPrincipalAmount" id="idt_DebtInstrumentInterestAddedToPrincipalAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DebtInstrumentInterestAddedToPrincipalSupercededAmount" id="idt_DebtInstrumentInterestAddedToPrincipalSupercededAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DebtInstrumentInterestPaymentRate" id="idt_DebtInstrumentInterestPaymentRate" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DebtInstrumentInterestRateNonPaymentPortion" id="idt_DebtInstrumentInterestRateNonPaymentPortion" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DebtInstrumentMaturitiesPeriod" id="idt_DebtInstrumentMaturitiesPeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DebtInstrumentsMaturityPeriod" id="idt_DebtInstrumentsMaturityPeriod" type="xbrli:stringItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DecreaseInOutstandingStockOptionExercisePriceAfterSpinoff" id="idt_DecreaseInOutstandingStockOptionExercisePriceAfterSpinoff" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DeferredTaxAssetsAccruedExpenses" id="idt_DeferredTaxAssetsAccruedExpenses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DeferredTaxAssetsBadDebtReserve" id="idt_DeferredTaxAssetsBadDebtReserve" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DeferredTaxAssetsDepreciation" id="idt_DeferredTaxAssetsDepreciation" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DeferredTaxAssetsStockOptions" id="idt_DeferredTaxAssetsStockOptions" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DeferredTaxAssetsUnrealizedGains" id="idt_DeferredTaxAssetsUnrealizedGains" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DeferredTaxLiabilitiesUnrealizedLosses" id="idt_DeferredTaxLiabilitiesUnrealizedLosses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DefinedContributionPlanDisclosureTextBlock" id="idt_DefinedContributionPlanDisclosureTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DefinedContributionPlanEmployerMatchingContributionInEmployerShares" id="idt_DefinedContributionPlanEmployerMatchingContributionInEmployerShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DefinedContributionPlanEmployerMatchingContributionLimitPercent" id="idt_DefinedContributionPlanEmployerMatchingContributionLimitPercent" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DepreciationAndAmortizationOfPropertyPlantAndEquipment" id="idt_DepreciationAndAmortizationOfPropertyPlantAndEquipment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DescriptionOfBusinessPolicyTextBlock" id="idt_DescriptionOfBusinessPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DilutiveSecuritiesNameDomain" id="idt_DilutiveSecuritiesNameDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DilutiveSecuritiesStockOptionsShares" id="idt_DilutiveSecuritiesStockOptionsShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureAccumulatedOtherComprehensiveIncomeLossScheduleOfAccumulatedBalancesForEachClassificationOfOtherComprehensiveIncomeAbstract" id="idt_DisclosureAccumulatedOtherComprehensiveIncomeLossScheduleOfAccumulatedBalancesForEachClassificationOfOtherComprehensiveIncomeAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureBusinessSegmentInformationAdditionalInformationAbstract" id="idt_DisclosureBusinessSegmentInformationAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureBusinessSegmentInformationOperatingResultsOfBusinessSegmentsAbstract" id="idt_DisclosureBusinessSegmentInformationOperatingResultsOfBusinessSegmentsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureCommitmentsAndContingenciesAdditionalInformationAbstract" id="idt_DisclosureCommitmentsAndContingenciesAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureCommitmentsAndContingenciesFutureMinimumPaymentsForOperatingLeasesAbstract" id="idt_DisclosureCommitmentsAndContingenciesFutureMinimumPaymentsForOperatingLeasesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureCommitmentsAndContingenciesRestrictedCashAndCashEquivalentsAbstract" id="idt_DisclosureCommitmentsAndContingenciesRestrictedCashAndCashEquivalentsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureDefinedContributionPlansAdditionalInformationAbstract" id="idt_DisclosureDefinedContributionPlansAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureDESCRIPTIONOFBUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESAdditionalInformationAbstract" id="idt_DisclosureDESCRIPTIONOFBUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureDescriptionOfBusinessAndSummaryOfSignificantAccountingPoliciesSummaryOfChangeInAllowanceForDoubtfulAccountsAbstract" id="idt_DisclosureDescriptionOfBusinessAndSummaryOfSignificantAccountingPoliciesSummaryOfChangeInAllowanceForDoubtfulAccountsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureDescriptionOfBusinessAndSummaryOfSignificantAccountingPoliciesSummaryOfOutstandingStockOptionsExcludedFromCalculationOfDilutedEarningsPerShareAbstract" id="idt_DisclosureDescriptionOfBusinessAndSummaryOfSignificantAccountingPoliciesSummaryOfOutstandingStockOptionsExcludedFromCalculationOfDilutedEarningsPerShareAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureDescriptionOfBusinessAndSummaryOfSignificantAccountingPoliciesSummaryOfWeightedAverageNumberOfSharesUsedInCalculationOfBasicAndDilutedEarningsPerShareAbstract" id="idt_DisclosureDescriptionOfBusinessAndSummaryOfSignificantAccountingPoliciesSummaryOfWeightedAverageNumberOfSharesUsedInCalculationOfBasicAndDilutedEarningsPerShareAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureDiscontinuedOperationsAdditionalInformationAbstract" id="idt_DisclosureDiscontinuedOperationsAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureDiscontinuedOperationsScheduleOfAssetsAndLiabilitiesOfDiscontinuedOperationsAbstract" id="idt_DisclosureDiscontinuedOperationsScheduleOfAssetsAndLiabilitiesOfDiscontinuedOperationsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureDiscontinuedOperationsSummaryFinancialDataOfDiscontinuedOperationsAbstract" id="idt_DisclosureDiscontinuedOperationsSummaryFinancialDataOfDiscontinuedOperationsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureEquityAdditionalInformationAbstract" id="idt_DisclosureEquityAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureFairValueMeasurementsAdditionalInformationAbstract" id="idt_DisclosureFairValueMeasurementsAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureFairValueMeasurementsSummaryOfChangeInCompanysAssetsMeasuredAtFairValueOnRecurringBasisAbstract" id="idt_DisclosureFairValueMeasurementsSummaryOfChangeInCompanysAssetsMeasuredAtFairValueOnRecurringBasisAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureGoodwillAndOtherIntangiblesAdditionalInformationAbstract" id="idt_DisclosureGoodwillAndOtherIntangiblesAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureGoodwillAndOtherIntangiblesScheduleOfChangeInCarryingAmountOfGoodwillByOperatingSegmentAbstract" id="idt_DisclosureGoodwillAndOtherIntangiblesScheduleOfChangeInCarryingAmountOfGoodwillByOperatingSegmentAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureGoodwillAndOtherIntangiblesScheduleOfOtherIntangibleAssetsAbstract" id="idt_DisclosureGoodwillAndOtherIntangiblesScheduleOfOtherIntangibleAssetsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureIncomeTaxesAdditionalInformationAbstract" id="idt_DisclosureIncomeTaxesAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureIncomeTaxesScheduleOfBenefitFromIncomeTaxesAbstract" id="idt_DisclosureIncomeTaxesScheduleOfBenefitFromIncomeTaxesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureIncomeTaxesScheduleOfChangeInValuationAllowanceAbstract" id="idt_DisclosureIncomeTaxesScheduleOfChangeInValuationAllowanceAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureIncomeTaxesScheduleOfDeferredIncomeTaxAssetsAndDeferredIncomeTaxLiabilitiesAbstract" id="idt_DisclosureIncomeTaxesScheduleOfDeferredIncomeTaxAssetsAndDeferredIncomeTaxLiabilitiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureIncomeTaxesScheduleOfIncomeLossFromContinuingOperationsBeforeIncomeTaxesAbstract" id="idt_DisclosureIncomeTaxesScheduleOfIncomeLossFromContinuingOperationsBeforeIncomeTaxesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureIncomeTaxesScheduleOfStatutoryIncomeTaxRateAndIncomeTaxesProvidedAbstract" id="idt_DisclosureIncomeTaxesScheduleOfStatutoryIncomeTaxRateAndIncomeTaxesProvidedAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureIncomeTaxesSummaryOfChangeInBalanceOfUnrecognizedIncomeTaxBenefitsAbstract" id="idt_DisclosureIncomeTaxesSummaryOfChangeInBalanceOfUnrecognizedIncomeTaxBenefitsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureLegalProceedingsAdditionalInformationAbstract" id="idt_DisclosureLegalProceedingsAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureNotesPayableScheduleOfEstimatedFuturePrincipalPaymentsOfNotesPayableAbstract" id="idt_DisclosureNotesPayableScheduleOfEstimatedFuturePrincipalPaymentsOfNotesPayableAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureNotesPayableScheduleOfNotesPayableAbstract" id="idt_DisclosureNotesPayableScheduleOfNotesPayableAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureOtherExpenseIncomeNetAdditionalInformationAbstract" id="idt_DisclosureOtherExpenseIncomeNetAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureOtherExpenseIncomeNetScheduleOfOtherIncomeExpenseNetAbstract" id="idt_DisclosureOtherExpenseIncomeNetScheduleOfOtherIncomeExpenseNetAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureOtherOperatingLossesGainsNetSummaryOfOtherOperatingLossesGainsNetByBusinessSegmentAbstract" id="idt_DisclosureOtherOperatingLossesGainsNetSummaryOfOtherOperatingLossesGainsNetByBusinessSegmentAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosurePropertyPlantAndEquipmentAdditionalInformationAbstract" id="idt_DisclosurePropertyPlantAndEquipmentAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosurePropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentAbstract" id="idt_DisclosurePropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureRelatedPartyTransactionsAdditionalInformationAbstract" id="idt_DisclosureRelatedPartyTransactionsAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureSelectedQuarterlyFinancialDataUnauditedSummaryOfSelectedQuarterlyFinancialDataAbstract" id="idt_DisclosureSelectedQuarterlyFinancialDataUnauditedSummaryOfSelectedQuarterlyFinancialDataAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureStockBasedCompensationAdditionalInformationAbstract" id="idt_DisclosureStockBasedCompensationAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureStockBasedCompensationGrantsOfRestrictedSharesOfClassBCommonStockAbstract" id="idt_DisclosureStockBasedCompensationGrantsOfRestrictedSharesOfClassBCommonStockAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureStockBasedCompensationScheduleOfRiskFreeRateBasedOnUSTreasuryYieldCurveEffectAtTimeOfGrantAbstract" id="idt_DisclosureStockBasedCompensationScheduleOfRiskFreeRateBasedOnUSTreasuryYieldCurveEffectAtTimeOfGrantAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisclosureStockBasedCompensationSummaryOfStockOptionActivityAbstract" id="idt_DisclosureStockBasedCompensationSummaryOfStockOptionActivityAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DiscontinuedOperationsAmountFundedAtTimeOfSpinOff" id="idt_DiscontinuedOperationsAmountFundedAtTimeOfSpinOff" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DiscontinuedOperationsAmountFundedSubsequentToSpinOff" id="idt_DiscontinuedOperationsAmountFundedSubsequentToSpinOff" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DiscontinuedOperationsSpinOffFundingCommitment" id="idt_DiscontinuedOperationsSpinOffFundingCommitment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisposalGroupIncludingDiscontinuedOperationRestrictedCashAndCashEquivalentsAtCarryingValue" id="idt_DisposalGroupIncludingDiscontinuedOperationRestrictedCashAndCashEquivalentsAtCarryingValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DisposalGroupIncludingDiscontinuedOperationsPrepaidExpenses" id="idt_DisposalGroupIncludingDiscontinuedOperationsPrepaidExpenses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DistributionToNoncontrollingInterests" id="idt_DistributionToNoncontrollingInterests" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DividendPaidInCash" id="idt_DividendPaidInCash" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DividendsDeclared" id="idt_DividendsDeclared" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DocumentDocumentandEntityInformationAbstract" id="idt_DocumentDocumentandEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DueFromCTMHoldingsMember" id="idt_DueFromCTMHoldingsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="DueToCTMHoldingsMember" id="idt_DueToCTMHoldingsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="EffectOfDilutiveSecuritiesOnEarningsPerShareByTypeOfAwardAxis" id="idt_EffectOfDilutiveSecuritiesOnEarningsPerShareByTypeOfAwardAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/> |
| <element name="EmployeeServiceShareBasedCompensationNonvestedStockOptionsTotalCompensationCostNotYetRecognized" id="idt_EmployeeServiceShareBasedCompensationNonvestedStockOptionsTotalCompensationCostNotYetRecognized" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="EmployeeServiceShareBasedCompensationNonvestedStockOptionsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" id="idt_EmployeeServiceShareBasedCompensationNonvestedStockOptionsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToForeignCountriesPercentage" id="idt_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributedToForeignCountriesPercentage" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="EntityWideDisclosureOnGeographicAreasTotalAssetsAttributedToForeignCountries" id="idt_EntityWideDisclosureOnGeographicAreasTotalAssetsAttributedToForeignCountries" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="EquipmentGross" id="idt_EquipmentGross" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="EquityLineItems" id="idt_EquityLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="EquityTextBlock" id="idt_EquityTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="EstimatedCarryingValueOfDamagedPortionOfBuildingAndImprovements" id="idt_EstimatedCarryingValueOfDamagedPortionOfBuildingAndImprovements" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ExchangeOfClassBCommonStockTreasurySharesForCommonStock" id="idt_ExchangeOfClassBCommonStockTreasurySharesForCommonStock" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ExchangeOfClassBCommonStockTreasurySharesForCommonStockShares" id="idt_ExchangeOfClassBCommonStockTreasurySharesForCommonStockShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ExciseAndSimilarTaxesMember" id="idt_ExciseAndSimilarTaxesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="FairValueInputsAssetsLiabilitiesQuantitativeInformationLineItems" id="idt_FairValueInputsAssetsLiabilitiesQuantitativeInformationLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="FairValueMeasurementsPolicyTextBlock" id="idt_FairValueMeasurementsPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="FiniteLivedIntangibleAssetsAmortizationPeriod" id="idt_FiniteLivedIntangibleAssetsAmortizationPeriod" type="xbrli:decimalItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="FirstInstallementMember" id="idt_FirstInstallementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="FiveLargestCustomersPercentageOfConsolidatedRevenues" id="idt_FiveLargestCustomersPercentageOfConsolidatedRevenues" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="FiveLargestReceivableBalancesPercentageOfConsolidatedGrossAccountsReceivable" id="idt_FiveLargestReceivableBalancesPercentageOfConsolidatedGrossAccountsReceivable" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ForeignCurrencyTranslationPolicyTextBlock" id="idt_ForeignCurrencyTranslationPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ForeignNetOperatingLossCarryforwards" id="idt_ForeignNetOperatingLossCarryforwards" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="GainLossFromInsuranceClaim" id="idt_GainLossFromInsuranceClaim" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="GainLossOnDispositionOfProperty1" id="idt_GainLossOnDispositionOfProperty1" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="GainLossOnDispositionOfSubsidiary" id="idt_GainLossOnDispositionOfSubsidiary" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="GainLossOnSaleOfAssets" id="idt_GainLossOnSaleOfAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="GainLossOnSaleOfWirelessSpectrum" id="idt_GainLossOnSaleOfWirelessSpectrum" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="GainLossOnSettlementOfArbitrationClaim" id="idt_GainLossOnSettlementOfArbitrationClaim" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="GainLossRelatedToLitigationSettlementOtherLoss" id="idt_GainLossRelatedToLitigationSettlementOtherLoss" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="GainLossRelatedToSettlement" id="idt_GainLossRelatedToSettlement" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="GainOnInsuranceSettlement" id="idt_GainOnInsuranceSettlement" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="GainOnInsuranceSettlement2" id="idt_GainOnInsuranceSettlement2" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="GainOnRedemptionOfAuctionRateSecurities" id="idt_GainOnRedemptionOfAuctionRateSecurities" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="GainOnSaleOfOtherAssets" id="idt_GainOnSaleOfOtherAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="GainOnSettlement" id="idt_GainOnSettlement" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="GainsLossesRelatedToDisposition" id="idt_GainsLossesRelatedToDisposition" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="GenieAndSubsidiariesMember" id="idt_GenieAndSubsidiariesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="GenieEnergyMember" id="idt_GenieEnergyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="GenieOilAndGasMember" id="idt_GenieOilAndGasMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="GenieSpinOffMember" id="idt_GenieSpinOffMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="GoodwillAndOtherIntangibleAssetsLineItems" id="idt_GoodwillAndOtherIntangibleAssetsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="GoodwillAndOtherIntangibleAssetsTable" id="idt_GoodwillAndOtherIntangibleAssetsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/> |
| <element name="GoodwillPolicyTextBlock" id="idt_GoodwillPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="IDTCarmelMember" id="idt_IDTCarmelMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="IDTCorpMember" id="idt_IDTCorpMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="IDTDomesticTelecomMember" id="idt_IDTDomesticTelecomMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="IDTEnergyMember" id="idt_IDTEnergyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="IDTEntertainmentMember" id="idt_IDTEntertainmentMember" type="nonnum:domainItemType" 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="IdtSpectrumMember" id="idt_IdtSpectrumMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="IGMBrokerageCorpMember" id="idt_IGMBrokerageCorpMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="IncomeTaxBenefitFromReversalOfPriorAccrual" id="idt_IncomeTaxBenefitFromReversalOfPriorAccrual" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="IncomeTaxDescriptionAxis" id="idt_IncomeTaxDescriptionAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/> |
| <element name="IncomeTaxDescriptionDomain" id="idt_IncomeTaxDescriptionDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="IncomeTaxesLineItems" id="idt_IncomeTaxesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="IncomeTaxesPayableMember" id="idt_IncomeTaxesPayableMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="IncomeTaxesTable" id="idt_IncomeTaxesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/> |
| <element name="IncomeTaxRefundClaims" id="idt_IncomeTaxRefundClaims" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="IncomeTaxRefundClaimsReversalOfExpense" id="idt_IncomeTaxRefundClaimsReversalOfExpense" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="IncreaseInEquityOwnershipInterestInWhollyOwnedSubsidiaryPercentage" id="idt_IncreaseInEquityOwnershipInterestInWhollyOwnedSubsidiaryPercentage" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="InnovativeCommunicationsTechnologiesIncMember" id="idt_InnovativeCommunicationsTechnologiesIncMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="IntangibleAssetsGoodwillAndOtherAssetsLineItems" id="idt_IntangibleAssetsGoodwillAndOtherAssetsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="IntangibleAssetsGoodwillAndOtherAssetsTable" id="idt_IntangibleAssetsGoodwillAndOtherAssetsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/> |
| <element name="InterestAtLIBORPlusBasisPoints" id="idt_InterestAtLIBORPlusBasisPoints" type="xbrli:integerItemType" abstract="false" 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="InvestmentsInAndAdvancesToAffiliates" id="idt_InvestmentsInAndAdvancesToAffiliates" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="JonasMediaGroupMember" id="idt_JonasMediaGroupMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="LandAndBuildingsGross" id="idt_LandAndBuildingsGross" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="LegalAndRelatedFeesRelatedToSettlementAgreement" id="idt_LegalAndRelatedFeesRelatedToSettlementAgreement" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="LegalFeesIncurred" id="idt_LegalFeesIncurred" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="LegalJudgmentCollaterizedBySuretyBond" id="idt_LegalJudgmentCollaterizedBySuretyBond" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="LegalSettlementByPartyLineItems" id="idt_LegalSettlementByPartyLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="LegalSettlementReflectCurrentEstimatedRangeOfLoss" id="idt_LegalSettlementReflectCurrentEstimatedRangeOfLoss" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="LegalSettlementReflectCurrentEstimatedRangeOfLoss2" id="idt_LegalSettlementReflectCurrentEstimatedRangeOfLoss2" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="LettersOfCreditOutstandingAndSuretyBondsAmount" id="idt_LettersOfCreditOutstandingAndSuretyBondsAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="LineOfCreditClosingFees" id="idt_LineOfCreditClosingFees" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" 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="LineOfCreditFacilityUnusedCapacityCommitmentsFeePercentage" id="idt_LineOfCreditFacilityUnusedCapacityCommitmentsFeePercentage" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="LitigationAndOtherContingenciesTable" id="idt_LitigationAndOtherContingenciesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/> |
| <element name="LongLivedAssetsPolicyTextBlock" id="idt_LongLivedAssetsPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="LongTermInvestmentsMember" id="idt_LongTermInvestmentsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="LossContingencyAccrualAmount" id="idt_LossContingencyAccrualAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="LossContingencyAggregateAccrualAmount" id="idt_LossContingencyAggregateAccrualAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="LossContingencyDamagesAwardedPreliminaryValue" id="idt_LossContingencyDamagesAwardedPreliminaryValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="LossContingencyDamagesInKindValue" id="idt_LossContingencyDamagesInKindValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="LossContingencyInterestRateOnDamagesAwarded" id="idt_LossContingencyInterestRateOnDamagesAwarded" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="MarketableSecurityStructuredNoteMaturityDate" id="idt_MarketableSecurityStructuredNoteMaturityDate" type="us-types:durationStringItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="MarketableSecurityStructuredNoteParValue" id="idt_MarketableSecurityStructuredNoteParValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="MasonAndCompanyMember" id="idt_MasonAndCompanyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="MinorityInterestOwnershipPercentageByNoncontrollingOwnersAfterTransaction" id="idt_MinorityInterestOwnershipPercentageByNoncontrollingOwnersAfterTransaction" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="MinorityInterestOwnershipPercentageByNoncontrollingOwnersBeforeTransaction" id="idt_MinorityInterestOwnershipPercentageByNoncontrollingOwnersBeforeTransaction" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="MortgageLoansOnRealEstatePeriodicPaymentTermsSupercededBalloonPaymentAmount" id="idt_MortgageLoansOnRealEstatePeriodicPaymentTermsSupercededBalloonPaymentAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="MortgageLoansPayableNet" id="idt_MortgageLoansPayableNet" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="NetAssetsExcludingCashAndCashEquivalentsOfSubsidiariesDeconsolidatedAsresultOfSpinOff" id="idt_NetAssetsExcludingCashAndCashEquivalentsOfSubsidiariesDeconsolidatedAsresultOfSpinOff" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="NetBookValueOfDamagedPropertyPlantAndEquipment" id="idt_NetBookValueOfDamagedPropertyPlantAndEquipment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="NetTwoPhoneMember" id="idt_NetTwoPhoneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="NonCompeteAgreementMember" id="idt_NonCompeteAgreementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="NonVestedRestrictedStockMember" id="idt_NonVestedRestrictedStockMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="NotesDueJuneTwoThousandTwelveMember" id="idt_NotesDueJuneTwoThousandTwelveMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="NumberOfDilutiveSecuritiesStock" id="idt_NumberOfDilutiveSecuritiesStock" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="NumberOfWirelessSpectrumLicensesSold" id="idt_NumberOfWirelessSpectrumLicensesSold" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="OtherExpenseIncomeNetMember" id="idt_OtherExpenseIncomeNetMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="OtherIncomeExpenseLineItems" id="idt_OtherIncomeExpenseLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="OtherIncomeExpenseTable" id="idt_OtherIncomeExpenseTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/> |
| <element name="OtherNoncontrollingInterestIncrease" id="idt_OtherNoncontrollingInterestIncrease" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="OtherOperatingGainsLossesOtherLoss" id="idt_OtherOperatingGainsLossesOtherLoss" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="OtherOperatingGainsLossNetTextBlock" id="idt_OtherOperatingGainsLossNetTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="OtherOperatingLossGains" id="idt_OtherOperatingLossGains" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="OtherOperatingLossIncomeNetLineItems" id="idt_OtherOperatingLossIncomeNetLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="OtherOperatingLossIncomeNetTable" id="idt_OtherOperatingLossIncomeNetTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/> |
| <element name="OtherServicesMember" id="idt_OtherServicesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="OthersMember" id="idt_OthersMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="OwnershipInterestPercentage" id="idt_OwnershipInterestPercentage" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="PatentLitigationExpense" id="idt_PatentLitigationExpense" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="PaymentForSettlementOfLitigation" id="idt_PaymentForSettlementOfLitigation" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="PercentageOfConsolidatedRevenuesNotExceededByAnySingleCustomer" id="idt_PercentageOfConsolidatedRevenuesNotExceededByAnySingleCustomer" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="PercentageOfEquityInterestSold" id="idt_PercentageOfEquityInterestSold" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="PercentageOfEquityInterestSold2" id="idt_PercentageOfEquityInterestSold2" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="PercentageOfOwnershipInterestsAcquired" id="idt_PercentageOfOwnershipInterestsAcquired" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="PercentageOfSubsidiaryEquityGrantedToEmployees" id="idt_PercentageOfSubsidiaryEquityGrantedToEmployees" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="PercentageOfSubsidiaryEquityStockOptionGrantedToSubsidiaryOfficer" id="idt_PercentageOfSubsidiaryEquityStockOptionGrantedToSubsidiaryOfficer" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="PercentOfSharesDisposedof" id="idt_PercentOfSharesDisposedof" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="PiscatawayMember" id="idt_PiscatawayMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="PortionOfProceedsUsedToRepayMortgageLoan" id="idt_PortionOfProceedsUsedToRepayMortgageLoan" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="PrimeRateBasisMember" id="idt_PrimeRateBasisMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ProceedsFromInsurancePolicies" id="idt_ProceedsFromInsurancePolicies" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ProceedsFromInsuranceSettlement" id="idt_ProceedsFromInsuranceSettlement" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ProceedsFromRedemptionOfAuctionRateSecurities" id="idt_ProceedsFromRedemptionOfAuctionRateSecurities" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ProceedsFromSaleOfBuildingAfterPaymentOfMortgageAndTransactionExpenses" id="idt_ProceedsFromSaleOfBuildingAfterPaymentOfMortgageAndTransactionExpenses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="PropertyPlantAndEquipmentEstimatedUsefulLivesMaximum" id="idt_PropertyPlantAndEquipmentEstimatedUsefulLivesMaximum" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="PropertyPlantAndEquipmentEstimatedUsefulLivesMinimum" id="idt_PropertyPlantAndEquipmentEstimatedUsefulLivesMinimum" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="PropertyPlantAndEquipmentTableTextBlock" id="idt_PropertyPlantAndEquipmentTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="QuarterlyFinancialDataLineItems" id="idt_QuarterlyFinancialDataLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="QuarterlyFinancialDataTable" id="idt_QuarterlyFinancialDataTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/> |
| <element name="RealizedGainsLossesAndOtherSettlements" id="idt_RealizedGainsLossesAndOtherSettlements" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ReasonablyPossibleLiabilityAboveAmountAccrued" id="idt_ReasonablyPossibleLiabilityAboveAmountAccrued" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ReasonablyPossibleTaxLiabilityInExcessOfAmountAccrued" id="idt_ReasonablyPossibleTaxLiabilityInExcessOfAmountAccrued" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RecentlyAdoptedAccountingStandardsAndRecentlyIssuedAccountingStandardsNotYetAdoptedPolicyTextBlock" id="idt_RecentlyAdoptedAccountingStandardsAndRecentlyIssuedAccountingStandardsNotYetAdoptedPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ReclassificationPolicyTextBlock" id="idt_ReclassificationPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RelatedPartyTransactionAggregatePaymentMadeToRelatedParty" id="idt_RelatedPartyTransactionAggregatePaymentMadeToRelatedParty" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RelatedPartyTransactionAggregateRentAndBuildOutCostsPaidToRelatedParty" id="idt_RelatedPartyTransactionAggregateRentAndBuildOutCostsPaidToRelatedParty" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RelatedPartyTransactionBillingsToRelatedPartyForServices" id="idt_RelatedPartyTransactionBillingsToRelatedPartyForServices" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RelatedPartyTransactionEmployeeLoanReceivable" id="idt_RelatedPartyTransactionEmployeeLoanReceivable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RelatedPartyTransactionLeaseAnnualRentPaymentsToRelatedParty" id="idt_RelatedPartyTransactionLeaseAnnualRentPaymentsToRelatedParty" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RelatedPartyTransactionPeriodOfRentalLeaseWithRelatedParty" id="idt_RelatedPartyTransactionPeriodOfRentalLeaseWithRelatedParty" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RelatedPartyTransactionReductionInSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty" id="idt_RelatedPartyTransactionReductionInSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RelatedPartyTransactionSiteBuildOutCostsPaidToRelatedParty" id="idt_RelatedPartyTransactionSiteBuildOutCostsPaidToRelatedParty" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RelatedPartyTransactionSquareFootageOfPropertyRentedFromRelatedParty" id="idt_RelatedPartyTransactionSquareFootageOfPropertyRentedFromRelatedParty" type="num:areaItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RepairAndMaintenancePolicyTextBlock" id="idt_RepairAndMaintenancePolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RepaymentCollectionOfNotesReceivableNet" id="idt_RepaymentCollectionOfNotesReceivableNet" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RepurchaseOfCommonStockFromRelatedParty" id="idt_RepurchaseOfCommonStockFromRelatedParty" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RepurchaseOfCommonStockUnderStockRepurchaseProgram" id="idt_RepurchaseOfCommonStockUnderStockRepurchaseProgram" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" 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="RestrictedCashAndCashEquivalentsLongTermMember" id="idt_RestrictedCashAndCashEquivalentsLongTermMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RestrictedCashAndCashEquivalentsShortTermMember" id="idt_RestrictedCashAndCashEquivalentsShortTermMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RestrictedCashMember" id="idt_RestrictedCashMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RestrictedStockIssuedToEmployeesAndDirectors" id="idt_RestrictedStockIssuedToEmployeesAndDirectors" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RestrictedStockIssuedToEmployeesAndDirectorsShares" id="idt_RestrictedStockIssuedToEmployeesAndDirectorsShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="RestrictedStockUnitsClassBMember" id="idt_RestrictedStockUnitsClassBMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ReversalOfValuationAllowanceFromRealizationOfExcessTaxBenefit" id="idt_ReversalOfValuationAllowanceFromRealizationOfExcessTaxBenefit" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ReversalOfValuationAllowanceOnDeferredTaxAssets" id="idt_ReversalOfValuationAllowanceOnDeferredTaxAssets" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="SalesTaxAuditMember" id="idt_SalesTaxAuditMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="SanJuanMember" id="idt_SanJuanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ScheduleOfAntiDilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTableTextBlock" id="idt_ScheduleOfAntiDilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ScheduleOfChangesInAllowanceForDoubtfulAccountsTableTextBlock" id="idt_ScheduleOfChangesInAllowanceForDoubtfulAccountsTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ScheduleOfDisposalGroupsIncludingDiscontinuedOperationsBalanceSheetDisclosuresTableTextBlock" id="idt_ScheduleOfDisposalGroupsIncludingDiscontinuedOperationsBalanceSheetDisclosuresTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ScheduleOfEquityTable" id="idt_ScheduleOfEquityTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/> |
| <element name="ScheduleOfOtherIncomeExpenseNetTableTextBlock" id="idt_ScheduleOfOtherIncomeExpenseNetTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ScheduleOfOtherOperatingLossIncomeNetTableTextBlock" id="idt_ScheduleOfOtherOperatingLossIncomeNetTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ScheduleOfReconciliationOfAssetOrLiabilityMeasuredAtFairValueOnRecurringBasisSignificantUnobservableInputsLevelThreeTableTextBlock" id="idt_ScheduleOfReconciliationOfAssetOrLiabilityMeasuredAtFairValueOnRecurringBasisSignificantUnobservableInputsLevelThreeTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="SecuredTermLoanDueAprilTwoThousandAndTwentyMember" id="idt_SecuredTermLoanDueAprilTwoThousandAndTwentyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="SecuredTermLoanDueSeptemberTwoThousandAndFifteenMember" id="idt_SecuredTermLoanDueSeptemberTwoThousandAndFifteenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="SegmentReportingDisclosureLineItems" id="idt_SegmentReportingDisclosureLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="SegmentReportingDisclosureTable" id="idt_SegmentReportingDisclosureTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/> |
| <element name="SegmentReportingOutsideCountryAxis" id="idt_SegmentReportingOutsideCountryAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/> |
| <element name="SegmentReportingOutsideCountryDomain" id="idt_SegmentReportingOutsideCountryDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="SeveranceAndOtherCharges" id="idt_SeveranceAndOtherCharges" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="SeveranceAndOtherPayments" id="idt_SeveranceAndOtherPayments" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfOldOptionsExchangedForNewOptionsShares" id="idt_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfOldOptionsExchangedForNewOptionsShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfOldOptionsExtendedForOneYearTerm" id="idt_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfOldOptionsExtendedForOneYearTerm" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrices" id="idt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrices" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrices" id="idt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrices" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ShareBasedCompensationArrangementCommonSharesEligibleForPurchaseRelatedToOptionsVestedAndExercisableNumber" id="idt_ShareBasedCompensationArrangementCommonSharesEligibleForPurchaseRelatedToOptionsVestedAndExercisableNumber" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ShareBasedCompensationArrangementStockOptionInSubsidiarySharesNumber" id="idt_ShareBasedCompensationArrangementStockOptionInSubsidiarySharesNumber" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="ShareBasedCompensationExpense" id="idt_ShareBasedCompensationExpense" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="SharesAvailableStockOptionIncentivePlanForFutureGrants" id="idt_SharesAvailableStockOptionIncentivePlanForFutureGrants" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="SharesExchangeBetweenSubsidiaries" id="idt_SharesExchangeBetweenSubsidiaries" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="SpinOffOfBusiness" id="idt_SpinOffOfBusiness" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="StandbyLetterOfCreditDueToExpireInOneToThreeYears" id="idt_StandbyLetterOfCreditDueToExpireInOneToThreeYears" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="StandbyLetterOfCreditDueToExpireInThreeToFiveYears" id="idt_StandbyLetterOfCreditDueToExpireInThreeToFiveYears" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="StandbyLettersOfCreditExpiresWithinOneYear" id="idt_StandbyLettersOfCreditExpiresWithinOneYear" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" 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="StockIssuedDuringPeriodSharesStockOptionExercised" id="idt_StockIssuedDuringPeriodSharesStockOptionExercised" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="StockIssuedDuringPeriodValueNewIssuesOfSubsidiary" id="idt_StockIssuedDuringPeriodValueNewIssuesOfSubsidiary" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="StockRepurchaseSpecialAuthorizationNumberOfSharesAuthorizedToBeRepurchased" id="idt_StockRepurchaseSpecialAuthorizationNumberOfSharesAuthorizedToBeRepurchased" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="SubsequentEventPeriodAxis" id="idt_SubsequentEventPeriodAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/> |
| <element name="SubsequentEventPeriodDomain" id="idt_SubsequentEventPeriodDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="SummaryOfNetRevenuePreTaxLossNetLossAndLossPerCommonShareFromDiscontinuedOperationsTableTextBlock" id="idt_SummaryOfNetRevenuePreTaxLossNetLossAndLossPerCommonShareFromDiscontinuedOperationsTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="TaxAuditPayments" id="idt_TaxAuditPayments" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="TaxesCollectedFromCustomersAndRemittedToGovernmentalAuthoritiesPolicyTextBlock" id="idt_TaxesCollectedFromCustomersAndRemittedToGovernmentalAuthoritiesPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="TaxLossContingencyAccrualAmount" id="idt_TaxLossContingencyAccrualAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" 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="TermOfIndefeasibleRightToUse" id="idt_TermOfIndefeasibleRightToUse" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="TMobileMember" id="idt_TMobileMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="TotalFederalAndStateTaxNetOperatingLossCarryForwards" id="idt_TotalFederalAndStateTaxNetOperatingLossCarryForwards" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="TotalSubsidiaryTaxNetOperatingLossCarryForwards" id="idt_TotalSubsidiaryTaxNetOperatingLossCarryForwards" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="TotalSubsidiaryTaxNetOperatingLossCarryForwardsAnnualLimitAmountUnderInternalRevenueCode" id="idt_TotalSubsidiaryTaxNetOperatingLossCarryForwardsAnnualLimitAmountUnderInternalRevenueCode" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="TradeAccountsPayableAccruedExpensesOtherCurrentLiabilitiesAndOtherLiabilitiesMember" id="idt_TradeAccountsPayableAccruedExpensesOtherCurrentLiabilitiesAndOtherLiabilitiesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="TrademarksAndPatentsMember" id="idt_TrademarksAndPatentsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="TreasurySharesIssuedRelatedToStockOptionExercisesAndDeferredStockConversions" id="idt_TreasurySharesIssuedRelatedToStockOptionExercisesAndDeferredStockConversions" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="TypeOfRestrictedAndUnrestrictedCashAndCashEquivalentsAxis" id="idt_TypeOfRestrictedAndUnrestrictedCashAndCashEquivalentsAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem"/> |
| <element name="TypeOfRestrictedAndUnrestrictedCashAndCashEquivalentsDomain" id="idt_TypeOfRestrictedAndUnrestrictedCashAndCashEquivalentsDomain" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="UniversalServiceFundChargesBilledToCustomersReportedGross" id="idt_UniversalServiceFundChargesBilledToCustomersReportedGross" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="UseOfEstimatesPolicyTextBlock" id="idt_UseOfEstimatesPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="WeightedAverageAmortizationPeriod" id="idt_WeightedAverageAmortizationPeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/> |
| <element name="WholesaleSupplyAgreementAllegedFailureToPurchaseAmount" id="idt_WholesaleSupplyAgreementAllegedFailureToPurchaseAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/> |
| </schema> |