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Accounts Receivable - Allowance for Doubtful Accounts (Detail) (Allowance for doubtful accounts [Member], USD $)
In Thousands, unless otherwise specified
6 Months Ended
Nov. 02, 2014
Oct. 27, 2013
Allowance for doubtful accounts [Member]
   
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ (573) $ (780)
Provision for bad debts 57 211
Net write-offs, net of recoveries 74 56
Ending balance $ (442) $ (513)