Schedule of Accumulated Balances for Each Classification of Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2022	Oct. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (11,305)
Other comprehensive loss attributable to IDT Corporation	(367)	$ 957
Ending balance	(11,672)
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	(222)
Ending balance	(768)
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	(145)
Ending balance	$ (10,904)