Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 2,973	$ 3,495	$ 7,023	$ 7,663
Other comprehensive income:
Foreign currency translation adjustments	518	1,645	1,182	3,273
Comprehensive income	3,491	5,140	8,205	10,936
Comprehensive income attributable to noncontrolling interests	(438)	(503)	(965)	(1,049)
Comprehensive income attributable to IDT Corporation	$ 3,053	$ 4,637	$ 7,240	$ 9,887