Leases and Other Commitments - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Lease and Rental Expense [Line Items]
Rent expense associated with the Company's operating leases	$ 2.3	$ 2.1	$ 1.8
Outstanding non-cancelable purchase orders	$ 38.2