Consolidated Statements of 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]
Revenues	$ 337,058	$ 339,766	$ 707,141	$ 683,191
Costs and expenses:
Direct cost of revenues (exclusive of depreciation and amortization)	257,325	269,145	548,950	542,319
Selling, general and administrative (i)	61,070	54,298	121,177	106,442
Depreciation and amortization	4,378	4,464	8,825	8,956
Severance	29	143	67	255
Total costs and expenses	322,802	328,050	679,019	657,972
Other operating (expense) gain, net (see Note 10)	(442)	1,207	(530)	955
Income from operations	13,814	12,923	27,592	26,174
Interest income, net	119	139	132	98
Other (expense) income, net	(2,949)	3,170	(19,165)	1,792
Income before income taxes	10,984	16,232	8,559	28,064
Provision for income taxes	(2,734)	(3,027)	(2,648)	(6,444)
Net income	8,250	13,205	5,911	21,620
Net (income) attributable to noncontrolling interests	(763)	(97)	(896)	(224)
Net income attributable to IDT Corporation	$ 7,487	$ 13,108	$ 5,015	$ 21,396
Earnings per share attributable to IDT Corporation common stockholders:
Basic	$ 0.29	$ 0.52	$ 0.20	$ 0.84
Diluted	$ 0.28	$ 0.51	$ 0.19	$ 0.83
Weighted-average number of shares used in calculation of earnings per share:
Basic	25,652,000	25,362,000	25,609,000	25,448,000
Diluted	26,542,000	25,713,000	26,580,000	25,787,000