Income Taxes - Schedule of Statutory Income Tax Rate and Income Taxes Provided (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
Income Tax Disclosure [Abstract]
U.S. federal income tax at statutory rate	$ (11,883)	$ 4,147	$ (2,660)
Valuation allowance		41,961	17,411
Foreign tax rate differential	(5,073)	(5,800)	(3,282)
Nondeductible expenses	714	(26)	(40)
Other	50		49
Prior year tax benefit	921	2,500	2,000
State and local income tax, net of federal benefit	(601)		(90)
(PROVISION FOR) BENEFIT FROM INCOME TAXES	$ (15,872)	$ 42,782	$ 13,388