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Schedule of Accumulated Balances for Each Classification of Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jan. 31, 2023
Jan. 31, 2022
Jan. 31, 2023
Jan. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ (11,305)  
Other comprehensive loss attributable to IDT Corporation $ (2,039) $ (1,862) (2,406) $ (905)
Ending balance (13,711)   (13,711)  
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     (546)  
Other comprehensive loss attributable to IDT Corporation     (34)  
Ending balance (580)   (580)  
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     (10,759)  
Other comprehensive loss attributable to IDT Corporation     (2,372)  
Ending balance $ (13,131)   $ (13,131)