Other Income (Expense), Net (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012
Schedule of other income (expense), net
Foreign currency transaction gains (losses)	$ 1,521	$ (2,372)	$ 3,566	$ (1,901)
Gain on investments	960	1,827	1,565	1,037
Other	(48)	(19)	2	60
Total other income (expense), net	$ 2,433	$ (564)	$ 5,133	$ (804)