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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Consolidated Statements of Comprehensive Income [Abstract]
NET INCOME	$ 86,115	$ 21,010	$ 13,444
Other comprehensive (loss) income:
Change in unrealized loss on available-for-sale securities	(567)	(8)	(1)
Foreign currency translation adjustments	(2,432)	1,335	2,092
Other comprehensive (loss) income	(2,999)	1,327	2,091
COMPREHENSIVE INCOME	83,116	22,337	15,535
Comprehensive income attributable to noncontrolling interests	(1,625)	(2,226)	(1,789)
COMPREHENSIVE INCOME ATTRIBUTABLE TO IDT CORPORATION	$ 81,491	$ 20,111	$ 13,746

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