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Schedule of Accumulated Balances for Each Classification of Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2023
Apr. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ (11,305)  
Other comprehensive loss attributable to IDT Corporation $ (764) $ (253) (3,170) $ (1,158)
Ending balance (14,475)   (14,475)  
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     81  
Ending balance (465)   (465)  
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     (3,251)  
Ending balance $ (14,010)   $ (14,010)