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Accounts Receivable - Allowance for Doubtful Accounts (Detail) (Allowance for doubtful accounts [Member], USD $)
In Thousands, unless otherwise specified
9 Months Ended
Jan. 27, 2013
Jan. 29, 2012
Allowance for doubtful accounts [Member]
   
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ (567) $ (776)
Provision for bad debts (193) 18
Net write-offs, net of recoveries 64 197
Ending balance $ (696) $ (561)