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Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Consolidated Statements of Comprehensive Income [Abstract]
Net (loss) income	$ (1,797)	$ 22,294
Other comprehensive loss:
Change in unrealized gain on available-for-sale securities	(30)	(23)
Foreign currency translation adjustments	(368)	(2,862)
Other comprehensive loss	(398)	(2,885)
Comprehensive (loss) income	(2,195)	19,409
Comprehensive income attributable to noncontrolling interests	(295)	(376)
Comprehensive (loss) income attributable to IDT Corporation	$ (2,490)	$ 19,033

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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