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Schedule of Accumulated Balances for Each Classification of Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jul. 31, 2023
Jul. 31, 2022
Jul. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance $ (11,305) $ (10,183) $ (7,410)
Other comprehensive loss attributable to IDT Corporation (5,887) (1,122) (2,773)
Ending balance (17,192) (11,305) (10,183)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (546) (9) 42
Other comprehensive loss attributable to IDT Corporation (99) (537) (51)
Ending balance (645) (546) (9)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (10,759) (10,174) (7,452)
Other comprehensive loss attributable to IDT Corporation (5,788) (585) (2,722)
Ending balance $ (16,547) $ (10,759) $ (10,174)