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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Income Statement [Abstract]
Net income (loss)	$ 36,398	$ 385	$ 58,018	$ (133)
Other comprehensive income (loss):
Change in unrealized loss on available-for-sale securities	(180)	84	(163)	84
Foreign currency translation adjustments	747	(647)	(817)	(2,364)
Other comprehensive income (loss)	567	(563)	(980)	(2,280)
Comprehensive income (loss)	36,965	(178)	57,038	(2,413)
Comprehensive (income) loss attributable to noncontrolling interests	(50)	133	(274)	70
Comprehensive income (loss) attributable to IDT Corporation	$ 36,915	$ (45)	$ 56,764	$ (2,343)

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