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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Schedule of accumulated balances for each classification of other comprehensive income (loss)    
Beginning balance $ (2,343)  
Other comprehensive loss attributable to IDT Corporation before reclassifications (398) $ (2,885)
Net other comprehensive loss attributable to IDT Corporation (398) $ (2,885)
Ending balance (2,741)  
Unrealized Gain (Loss) on Available-for-Sale Securities [Member]    
Schedule of accumulated balances for each classification of other comprehensive income (loss)    
Beginning balance 2,134  
Other comprehensive loss attributable to IDT Corporation before reclassifications (23)  
Net other comprehensive loss attributable to IDT Corporation (30)  
Ending balance 2,104  
Unrealized Gain (Loss) 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 loss (7)  
Foreign Currency Translation [Member]    
Schedule of accumulated balances for each classification of other comprehensive income (loss)    
Beginning balance (4,477)  
Other comprehensive loss attributable to IDT Corporation before reclassifications (368)  
Net other comprehensive loss attributable to IDT Corporation (368)  
Ending balance (4,845)  
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 loss  
Accumulated Other Comprehensive Loss [Member]    
Schedule of accumulated balances for each classification of other comprehensive income (loss)    
Beginning balance (2,343)  
Other comprehensive loss attributable to IDT Corporation before reclassifications (391)  
Net other comprehensive loss attributable to IDT Corporation (398)  
Ending balance (2,741)  
Accumulated Other Comprehensive 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 loss $ (7)