Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Schedule of Employee Benefit Plans [Line Items]
Employer match and administrative fees for 401(k) plan	$ 917	$ 565	$ 387
Investments under employees deferred compensation plan	$ 15,529	$ 10,803