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Business Segment Information (Details Textual) $ in Thousands | 12 Months Ended
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Jul. 31, 2015 USD ($) Segment | Jul. 31, 2014 USD ($) | Jul. 31, 2013 USD ($)
Business segment information (Textual) |  |  |
Number of reportable segments | Segment | 2 |  |
Net gains related to legal matters |  | $ 650 | $ 9,251
Telecom Platform Services [Member] |  |  |
Business segment information (Textual) |  |  |
Net gains related to legal matters |  |  | $ 9,300

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- References No definition available. + Details
Name: | idt_BusinessSegmentInformationTextualAbstract
Namespace Prefix: | idt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of gain (loss) related to settlement of legal matter. + References No definition available. + Details
Name: | idt_GainLossRelatedToSettlementOfLegalMatter
Namespace Prefix: | idt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=idt_TelecomPlatformServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |