Summary of Allowance for Doubtful Accounts Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Allowance for Sales Return and Doubtful Accounts [Line Items]
Beginning balance	$ 1,283	$ 348	$ 157
Net recorded expense (income)	(9)	359	63
Write-offs, net of recoveries/payments	(679)	(67)	(72)
Acquisitions	30	643	200
Ending balance	$ 625	$ 1,283	$ 348