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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
Jul. 28, 2013
Jul. 29, 2012
Allowance for doubtful accounts [Member]
   
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ (780) $ (567)
Provision for bad debts 7 (41)
Net write-offs, net of recoveries 30 (31)
Ending balance $ (743) $ (639)