Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Consolidated Statements of Comprehensive Income [Abstract]
NET INCOME	$ 25,358	$ 86,115	$ 21,010
Other comprehensive (loss) income:
Change in unrealized loss on available-for-sale securities	583	(567)	(8)
Foreign currency translation adjustments	(6,127)	(2,432)	1,335
Other comprehensive (loss) income	(5,544)	(2,999)	1,327
COMPREHENSIVE INCOME	19,814	83,116	22,337
Comprehensive income attributable to noncontrolling interests	(1,844)	(1,625)	(2,226)
COMPREHENSIVE INCOME ATTRIBUTABLE TO IDT CORPORATION	$ 17,970	$ 81,491	$ 20,111