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Summary of Allowance for Doubtful Accounts Activity (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jul. 31, 2014
Jul. 31, 2013
Jul. 31, 2012
Allowance for Sales Return and Doubtful Accounts [Line Items]      
Beginning balance $ 157 $ 527 $ 549
Net charged to expense 63 (47) 32
Write-offs net of recoveries/payments (72) (130) (54)
Acquisitions 200    
Discontinued operations reclassification   (193)  
Ending balance $ 348 $ 157 $ 527