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Commitments and Contingencies (Details 1) (Straight Path [Member], USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Apr. 30, 2015
Straight Path [Member] |
Schedule of changes in company estimated liability |
Balance, beginning of period | $ 1,860 idt_ChangeInBalanceOfEstimatedLiabilityIncludedInOtherCurrentLiabilities / dei_LegalEntityAxis = idt_StraightPathMember
Additional liability | 1,732 idt_ChangeInBalanceOfEstimatedLiabilityAdditionalLiability / dei_LegalEntityAxis = idt_StraightPathMember
Adjustments | (540)idt_ChangeInBalanceOfEstimatedLiabilityAdjustmentslLiability / dei_LegalEntityAxis = idt_StraightPathMember
Payments | (2,104)idt_ChangeInBalanceOfEstimatedLiabilityPayments / dei_LegalEntityAxis = idt_StraightPathMember
Balance, end of period | $ 948 idt_ChangeInBalanceOfEstimatedLiabilityIncludedInOtherCurrentLiabilities / dei_LegalEntityAxis = idt_StraightPathMember

X
- Definition Change in balance of estimated liability additional liability. + References No definition available. + Details
Name: | idt_ChangeInBalanceOfEstimatedLiabilityAdditionalLiability
Namespace Prefix: | idt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Change in balance of estimated liability adjustmentl liability. + References No definition available. + Details
Name: | idt_ChangeInBalanceOfEstimatedLiabilityAdjustmentslLiability
Namespace Prefix: | idt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Change in balance of estimated liability included in other current liabilities. + References No definition available. + Details
Name: | idt_ChangeInBalanceOfEstimatedLiabilityIncludedInOtherCurrentLiabilities
Namespace Prefix: | idt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Change in balance of estimated liability payments. + References No definition available. + Details
Name: | idt_ChangeInBalanceOfEstimatedLiabilityPayments
Namespace Prefix: | idt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | idt_ScheduleOfChangesInCompanyEstimatedLiabilityAbstract
Namespace Prefix: | idt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration