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Related Party Transactions (Tables) | 12 Months Ended
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Jul. 31, 2015
Related Party Transactions [Abstract] |
Summary of changes in estimated liability to straight Path included in other current liabilities |
Year ended July 31 |  |  |  |  |  |
(in thousands) |  | 2015 |  |  | 2014 |
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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- Definition Tabular disclosure of changes in company's estimated liability. + References No definition available. + Details
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Namespace Prefix: | idt_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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