Other (Expense) Income, Net - Schedule of Other (Expense) Income, Net (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Other Operating Gains (Loss) and Other (Expense) Income, Net [Abstract]
Foreign currency transaction (losses) gains	$ (3,157)	$ 1,481	$ (4,362)	$ 2,045
Gain on investments	117	313	853	605
Other	(25)	21	(105)	50
Total other income (expense), net	$ (3,065)	$ 1,815	$ (3,614)	$ 2,700