Income Taxes - Summary of Change in Balance of Unrecognized Income Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 356		$ 3,754
Additions based on tax positions related to the current year
Additions for tax positions of prior years		356
Reductions for tax positions of prior years
Settlements	(356)		(3,754)
Lapses of statutes of limitations
Balance at end of year		$ 356