Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 5,659	$ 2,531
Other comprehensive (loss) income , net of tax:
Foreign currency translation adjustment, net of tax	(222)	(1,574)
Unrecognized gain on pension benefits, net of tax	42	58
Unrealized loss on foreign currency forward contracts, net of tax	(409)	(214)
Unrealized loss on available-for-sale securities, net of tax	(52)
Total other comprehensive loss, net of tax	(641)	(1,730)
Total comprehensive income	$ 5,018	$ 801