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Related Party Transactions (Details) - Straight Path [Member] - USD ($) $ in Thousands | 12 Months Ended
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Jul. 31, 2015 | Jul. 31, 2014
Estimated liability to stright path included in other current liabilities |  |
Balance at beginning of year | $ 1,860 | $ 931
Additional liability | 1,793 | $ 1,930
Adjustments | (556) |
Payments | (2,811) | $ (1,001)
Balance at end of year | $ 286 | $ 1,860

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Balance Type: | debit
Period Type: | duration

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- Definition Change in balance of estimated liability adjustments. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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

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- Definition Schedule of changes in company estimated liability abstract. + References No definition available. + Details
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Namespace Prefix: | idt_
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |