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Accounts Receivable - Allowance for Doubtful Accounts (Detail) (Allowance for doubtful accounts [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Aug. 03, 2014
Jul. 28, 2013
Allowance for doubtful accounts [Member]
   
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ (573) $ (780)
Provision for bad debts 69 7
Net write-offs, net of recoveries 66 30
Ending balance $ (438) $ (743)