Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Income Statement [Abstract]
Revenues	$ 328,353	$ 373,831	$ 1,035,494	$ 1,057,022
Costs and expenses:
Direct cost of revenues (exclusive of depreciation and amortization)	247,565	300,797	796,516	843,116
Selling, general and administrative (i)	62,772	55,148	183,948	161,591
Depreciation and amortization	4,509	4,425	13,333	13,381
Severance		184	67	439
Total costs and expenses	314,846	360,554	993,864	1,018,527
Other operating (expense) gain, net (see Note 11)	(179)	595	(709)	1,550
Income from operations	13,328	13,872	40,921	40,045
Interest income, net	85	125	217	223
Other (expense) income, net	(5,068)	3,815	(24,234)	5,608
Income before income taxes	8,345	17,812	16,904	45,876
(Provision for) benefit from income taxes	(3,239)	18,586	(5,887)	12,142
Net income	5,106	36,398	11,017	58,018
Net (income) attributable to noncontrolling interests	(335)	(50)	(1,231)	(274)
Net income attributable to IDT Corporation	$ 4,771	$ 36,348	$ 9,786	$ 57,744
Earnings per share attributable to IDT Corporation common stockholders:
Basic	$ 0.18	$ 1.42	$ 0.38	$ 2.27
Diluted	$ 0.18	$ 1.39	$ 0.37	$ 2.23
Weighted-average number of shares used in calculation of earnings per share:
Basic	25,901	25,530	25,706	25,475
Diluted	26,205	26,136	26,455	25,903