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Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Income Statement [Abstract]
Revenues		$ 321,336	$ 341,255	$ 985,425	$ 1,053,044
Costs and expenses:
Direct cost of revenues (exclusive of depreciation and amortization)		258,839	282,791	801,016	878,661
Selling, general and administrative	[1]	52,630	49,518	159,853	150,970
Depreciation and amortization		5,239	5,524	15,718	16,881
Severance		602	553	1,714	553
Total costs and expenses		317,310	338,386	978,301	1,047,065
Other operating expense, net (see Note 9)		(234)	(2,420)	(3,402)	(5,805)
Income from operations		3,792	449	3,722	174
Interest income, net		56	177	525	472
Other (expense) income, net		(2,144)	360	(1,360)	(494)
Income before income taxes		1,704	986	2,887	152
(Provision for) benefit from income taxes		(1,319)	1,471	(3,020)	(704)
Net income (loss)		385	2,457	(133)	(552)
Net loss (income) attributable to noncontrolling interests		133	(287)	70	(888)
Net income (loss) attributable to IDT Corporation		$ 518	$ 2,170	$ (63)	$ (1,440)
Earnings (loss) per share attributable to IDT Corporation common stockholders:
Basic		$ 0.02	$ 0.08	$ (0.00)	$ (0.06)
Diluted		$ 0.02	$ 0.08	$ 0.00	$ (0.06)
Weighted-average number of shares used in calculation of earnings (loss) per share:
Basic		26,371	26,263	26,323	24,970
Diluted		26,506	26,263	26,323	24,970
(i) Stock-based compensation included in selling, general and administrative expenses		$ 810	$ 332	$ 3,341	$ 1,212
[1] Stock-based compensation included in selling, general and administrative expenses

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