Income Taxes - Schedule of Statutory Income Tax Rate and Income Taxes Provided (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Income Tax Disclosure [Abstract]
U.S. federal income tax at statutory rate	$ (8,747)	$ (11,883)	$ 4,147
Valuation allowance	4,110		41,961
Foreign tax rate differential	961	(5,073)	(5,800)
Nondeductible expenses	761	714	(26)
Other	7	50
Prior year tax (expense) benefit	(960)	921	2,500
State and local income tax, net of federal benefit	(114)	(601)
(PROVISION FOR) BENEFIT FROM INCOME TAXES	$ (3,982)	$ (15,872)	$ 42,782