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Accounts Receivable (Detail) - USD ($)
$ in Thousands
May 01, 2016
May 03, 2015
Apr. 27, 2014
Apr. 28, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]        
customers $ 25,531 $ 30,338    
accounts receivable, net 23,481 28,749    
Allowance for doubtful accounts [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
valuation allowance, balance (1,088) (851) $ (573) $ (780)
Reserve for returns and allowances and discounts [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
valuation allowance, balance $ (962) $ (738) $ (479) $ (543)