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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2020
Apr. 30, 2019
Schedule of accumulated balances for each classification of other comprehensive loss        
Beginning balance     $ (4,858)  
Other comprehensive income (loss) attributable to IDT Corporation $ (563) $ (10) (2,280) $ 474
Ending balance (7,138)   (7,138)  
Unrealized Gain (Loss) on Available-for-Sale Securities [Member]        
Schedule of accumulated balances for each classification of other comprehensive loss        
Beginning balance      
Other comprehensive income (loss) attributable to IDT Corporation     84  
Ending balance 84   84  
Foreign Currency Translation [Member]        
Schedule of accumulated balances for each classification of other comprehensive loss        
Beginning balance     (4,858)  
Other comprehensive income (loss) attributable to IDT Corporation     (2,364)  
Ending balance (7,222)   (7,222)  
Accumulated Other Comprehensive Loss [Member]        
Schedule of accumulated balances for each classification of other comprehensive loss        
Beginning balance     (4,858)  
Other comprehensive income (loss) attributable to IDT Corporation     (2,280)  
Ending balance $ (7,138)   $ (7,138)