Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (1,422)	$ (1,998)
Other comprehensive (loss) income:
Change in unrealized gain on available-for-sale securities		(2)
Foreign currency translation adjustments	(1,204)	524
Other comprehensive (loss) income	(1,204)	522
Comprehensive loss	(2,626)	(1,476)
Comprehensive income attributable to noncontrolling interests	(91)	(301)
Comprehensive loss attributable to IDT Corporation	$ (2,717)	$ (1,777)