Other (Expense) Income, Net - Schedule of Other (Expense) Income, Net (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Other Operating Gains (Loss) and Other (Expense) Income, Net [Abstract]
Foreign currency transaction (losses) gains	$ (1,205)	$ 564
Gain on investments	736	292
Other	(80)	29
Total other (expense) income, net	$ (549)	$ 885