Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 6,549	$ 7,510	$ 12,207	$ 10,046
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment, net of tax	4,963	(1,019)	4,741	(2,593)
Unrecognized gain on pension benefits, net of tax	31	52	73	110
Unrealized gain (loss) on foreign currency forward contracts, net of tax	305	385	(104)	171
Unrealized loss on available-for-sale securities, net of tax	(66)		(118)
Total other comprehensive income (loss), net of tax	5,233	(582)	4,592	(2,312)
Total comprehensive income	$ 11,782	$ 6,928	$ 16,799	$ 7,734