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Accounts Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Oct. 28, 2012
Apr. 29, 2012
Oct. 30, 2011
May 01, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Customers $ 21,790 $ 26,100    
Accounts receivable, net 20,678 25,055 [1] 16,241  
Allowance for doubtful accounts [Member]
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation allowance, balance (559) (567) (686) (776)
Reserve for returns and allowances and discounts [Member]
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation allowance, balance $ (553) $ (478) $ (420) $ (577)
[1] Derived from audited financial statements.