Other Income (Expense), Net (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Schedule of other income (expense), net
Foreign currency transaction gains	$ 1,481	$ 45	$ 2,045	$ 471
Gain (loss) on investments	313	(548)	605	(790)
Other	21	74	50	79
Total other income (expense), net	$ 1,815	$ (429)	$ 2,700	$ (240)