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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016
Schedule of accumulated balances for each classification of other comprehensive income (loss) |  |  |  |
Beginning balance | $ (2,343) | $ (3,744) |  |
Net other comprehensive income (loss) attributable to IDT Corporation | (359) | 1,401 |  | $ (5,544)
Ending balance | (4,972) | (2,343) |  | (3,744)
Unrealized (loss) gain on available-for-sale securities [Member] |  |  |  |
Schedule of accumulated balances for each classification of other comprehensive income (loss) |  |  |  |
Beginning balance | 2,134 | 8 |  | (575)
Zedge/Rafael Spin-Off | (1,991) |  |  |
Other comprehensive income (loss) attributable to IDT Corporation before reclassification | (193) | 2,449 |  | 1,126
Less: reclassification for gain included in net income | 16 | (323) |  | (543)
Net other comprehensive income (loss) attributable to IDT Corporation | (177) | 2,126 | [1] | 583
Ending balance | (34) | 2,134 |  | 8
Unrealized (loss) gain on available-for-sale securities [Member] | Other (expense) income, net [Member] |  |  |  |
Schedule of accumulated balances for each classification of other comprehensive income (loss) |  |  |  |
Less: reclassification for gain included in net income | 16 | (323) |  | (543)
Foreign currency translation [Member] |  |  |  |
Schedule of accumulated balances for each classification of other comprehensive income (loss) |  |  |  |
Beginning balance | (4,477) | (3,752) |  | 1,346
Zedge/Rafael Spin-Off | (279) |  |  | 1,029
Other comprehensive income (loss) attributable to IDT Corporation before reclassification | (182) | (725) |  | (6,127)
Less: reclassification for gain included in net income |  |  |  |
Net other comprehensive income (loss) attributable to IDT Corporation | (182) | (725) | [1] | (6,127)
Ending balance | (4,938) | (4,477) |  | (3,752)
Foreign currency translation [Member] | Other (expense) income, net [Member] |  |  |  |
Schedule of accumulated balances for each classification of other comprehensive income (loss) |  |  |  |
Less: reclassification for gain included in net income |  |  |  |
Accumulated other comprehensive income (loss) [Member] |  |  |  |
Schedule of accumulated balances for each classification of other comprehensive income (loss) |  |  |  |
Beginning balance | (2,343) | (3,744) |  | 771
Zedge/Rafael Spin-Off | (2,270) |  |  | 1,029
Other comprehensive income (loss) attributable to IDT Corporation before reclassification | (375) | 1,724 |  | (5,001)
Less: reclassification for gain included in net income | 16 | (323) |  | (543)
Net other comprehensive income (loss) attributable to IDT Corporation | (359) | 1,401 | [1] | (5,544)
Ending balance | (4,972) | (2,343) |  | (3,744)
Accumulated other comprehensive income (loss) [Member] | Other (expense) income, net [Member] |  |  |  |
Schedule of accumulated balances for each classification of other comprehensive income (loss) |  |  |  |
Less: reclassification for gain included in net income | $ 16 | $ (323) |  | $ (543)
[1] | In fiscal 2017, net other comprehensive income attributable to IDT Corporation from unrealized gains on available-for-sale securities included unrealized gains on the Rafael convertible promissory notes of $2.1 million and unrealized gains, net on marketable securities of $26,000.

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