Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2020
Income Statement [Abstract]
REVENUES	$ 1,364,057	$ 1,446,990	$ 1,345,769
COSTS AND EXPENSES:
Direct cost of revenues (exclusive of depreciation and amortization)	1,034,430	1,154,048	1,084,009
Selling, general and administrative (i)	250,481	218,467	214,846
Depreciation and amortization	18,115	17,764	20,406
Severance	116	452	3,503
TOTAL COSTS AND EXPENSES	1,303,142	1,390,731	1,322,764
Other operating (expense) gain, net (see Note 14)	(826)	731	(5,063)
Income from operations	60,089	56,990	17,942
Interest income, net	146	318	1,043
Other (expense) income, net	(25,352)	7,916	(1,267)
Income before income taxes	34,883	65,224	17,718
(Provision for) benefit from income taxes	(5,878)	31,667	3,700
NET INCOME	29,005	96,891	21,418
Net (income) loss attributable to noncontrolling interests	(1,977)	(416)	12
NET INCOME ATTRIBUTABLE TO IDT CORPORATION	$ 27,028	$ 96,475	$ 21,430
Earnings per share attributable to IDT Corporation common stockholders:
Basic	$ 1.05	$ 3.78	$ 0.82
Diluted	$ 1.03	$ 3.70	$ 0.81
Weighted-average number of shares used in calculation of earnings per share:
Basic	25,791	25,495	26,278
Diluted	26,356	26,053	26,441