Other Income (Expense), Net - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended
	May 01, 2013	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Other Income Expense Net [Line Items]
Gain on modification and early termination of loan payable			$ 238,000
Payments to Lender	21,100,000
April 30, 2013 [Member]
Other Income Expense Net [Line Items]
Gain on modification and early termination of loan payable			$ 200,000