Tax Benefits Relating to Valuation Allowance for Deferred Tax Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Income Taxes [Line Items]
Income tax benefit recognized in the consolidated statement of operations	$ (2,040)	$ (234)	$ (528)
Valuation Allowance of Deferred Tax Assets
Income Taxes [Line Items]
Income tax benefit recognized in the consolidated statement of operations	(735,108)
Additional paid in capital	(15,461)
Deferred Tax Assets Valuation Allowance Additions	$ (750,569)