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Summary of Allowance for Doubtful Accounts Activity (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2011
Allowance for Sales Return and Doubtful Accounts [Line Items]      
Beginning balance $ 527 $ 549 $ 422
Net charged to expense (47) 32 3
Write-offs net of recoveries/payments (130) (54) (116)
Heartland acquisition     240
Discontinued operations reclassification (193)    
Ending balance $ 157 $ 527 $ 549