Components of (Benefit from) Provision for Income Taxes (Detail) (USD $)	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Current income taxes provision (benefit):
Federal	$ (5,200,000)	$ 11,100,000	$ 3,400,000
State	300,000	500,000	600,000
Non-U.S.	4,900,000	400,000	200,000
Current income tax provision		12,000,000	4,200,000
Deferred income taxes (benefit) provision:
Federal	(2,900,000)	12,300,000	(3,400,000)
State	(400,000)	(100,000)
Non-U.S.	(2,100,000)	(11,200,000)	300,000
Deferred income tax (benefit) provision	(5,400,000)	1,000,000	(3,100,000)
(Benefit from) provision for income taxes	$ (5,442,000)	$ 12,976,000	$ 1,128,000