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Accounts Receivable - Allowance for Doubtful Accounts (Detail) (Allowance for doubtful accounts [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Apr. 28, 2013
Apr. 29, 2012
May 01, 2011
Allowance for doubtful accounts [Member]
     
Valuation and Qualifying Accounts Disclosure [Line Items]      
beginning balance $ (567) $ (776) $ (1,322)
provision for bad debts (283) (67) 273
write-offs, net of recoveries 70 276 273
ending balance $ (780) $ (567) $ (776)