Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Income Statement [Abstract]
Net income	$ 8,250	$ 13,205	$ 5,911	$ 21,620
Other comprehensive (loss) income:
Change in unrealized loss on available-for-sale securities	(212)	46	(323)	17
Foreign currency translation adjustments	(1,650)	(1,815)	(582)	(1,564)
Other comprehensive loss	(1,862)	(1,769)	(905)	(1,547)
Comprehensive income	6,388	11,436	5,006	20,073
Comprehensive (income) attributable to noncontrolling interests	(763)	(97)	(896)	(224)
Comprehensive income attributable to IDT Corporation	$ 5,625	$ 11,339	$ 4,110	$ 19,849