Other Income (Expense), Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Schedule of other income (expense), net
Foreign currency transaction gains (losses)	$ 287	$ 980	$ (1,704)
Gain (loss) on marketable securities	323	543	(54)
Gain (loss) on investments	355	(405)	1,500
Other	(148)	931	(430)
TOTAL	$ 817	$ 2,049	$ (688)