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Accounts Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 27, 2014
Apr. 28, 2013
Apr. 29, 2012
May 01, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]        
customers $ 28,461 $ 24,715    
accounts receivable, net 27,409 23,392    
Allowance for doubtful accounts [Member]
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
valuation allowance, balance (573) (780) (567) (776)
Reserve for returns and allowances and discounts [Member]
       
Accounts, Notes, Loans and Financing Receivable [Line Items]        
valuation allowance, balance $ (479) $ (543) $ (478) $ (577)