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