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Accounts Receivable (Detail) - USD ($)
$ in Thousands
May. 03, 2015
Apr. 27, 2014
Apr. 28, 2013
Apr. 29, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]        
customers $ 30,338 $ 28,461    
accounts receivable, net 28,749 27,409    
Allowance for doubtful accounts [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
valuation allowance, balance (851) (573) $ (780) $ (567)
Reserve for returns and allowances and discounts [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
valuation allowance, balance $ (738) $ (479) $ (543) $ (478)