Summary of Allowance for Doubtful Accounts Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Allowance for Sales Return and Doubtful Accounts [Line Items]
Beginning balance	$ 348	$ 157	$ 527
Net charged to expense	359	63	(47)
Write-offs, net of recoveries/payments	(67)	(72)	(130)
Acquisitions	643	200
Discontinued operations reclassification			(193)
Ending balance	$ 1,283	$ 348	$ 157