Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 330	$ 5,199	$ 9,641
Other comprehensive income (loss):
Change in unrealized gain (loss) on available-for-sale securities	1	(177)	2,126
Foreign currency translation adjustments	80	(182)	(725)
Other comprehensive income (loss)	81	(359)	1,401
COMPREHENSIVE INCOME	411	4,840	11,042
Comprehensive income attributable to noncontrolling interests	(196)	(991)	(1,464)
COMPREHENSIVE INCOME ATTRIBUTABLE TO IDT CORPORATION	$ 215	$ 3,849	$ 9,578