Other (Expense) Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016
Other (Expense) Income, Net [Abstract]
Foreign currency transaction (losses) gains	$ (729)	$ (1,096)	$ 1,330	$ (2,258)
(Loss) gain on marketable securities	305		305	543
Gain (loss) on investments	32	236	295	80
Other	(27)	626	44	791
Total other (expense) income, net	$ (419)	$ (234)	$ 1,974	$ (844)