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Accounts Receivable - Allowance for Doubtful Accounts (Detail) - Allowance for doubtful accounts [Member] - USD ($)
$ in Thousands
3 Months Ended
Aug. 02, 2015
Aug. 03, 2014
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ (851) $ (573)
Provision for bad debts (96) 69
Net write-offs, net of recoveries 12 66
Ending balance $ (935) $ (438)