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Schedule of Accumulated Balances for Each Classification of Other Comprehensive (Loss) Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ (10,183)  
Other comprehensive (loss) income attributable to IDT Corporation 957 $ 222
Ending balance (9,226)  
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (9)  
Other comprehensive (loss) income attributable to IDT Corporation (111)  
Ending balance (120)  
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (10,174)  
Other comprehensive (loss) income attributable to IDT Corporation 1,068  
Ending balance $ (9,106)