Accounts Receivable - Additional Information (Detail) (USD $)	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of accounts receivable factored	$ 27,300,000	$ 7,700,000
Cost incurred on the sale of receivables	$ 14,000	$ 6,000
London Interbank Offered Rate (LIBOR)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest rate on the sale of receivables	0.85%