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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
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.