Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
Income Statement [Abstract]
NET INCOME	$ 96,891	$ 21,418
Other comprehensive (loss) income:
Change in unrealized gain on available-for-sale securities	(51)	42
Foreign currency translation adjustments	(2,722)	(2,594)
Other comprehensive loss	(2,773)	(2,552)
COMPREHENSIVE INCOME	94,118	18,866
Comprehensive (income) loss attributable to noncontrolling interests	(416)	12
COMPREHENSIVE INCOME ATTRIBUTABLE TO IDT CORPORATION	$ 93,702	$ 18,878