Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 7,510	$ (2,985)	$ 10,046	$ (1,609)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment, net of tax	(1,019)	(2,729)	(2,593)	(3,248)
Unrecognized gain on pension benefits, net of tax	52	50	110	50
Unrealized gain (loss) on foreign currency forward contracts, net of tax	385	(127)	171	(15)
Total other comprehensive loss, net of tax	(582)	(2,806)	(2,312)	(3,213)
Total comprehensive income (loss)	$ 6,928	$ (5,791)	$ 7,734	$ (4,822)