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Accounts Receivable (Detail) - USD ($)
$ in Thousands
Apr. 30, 2017
May 01, 2016
May 03, 2015
Apr. 27, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
customers $ 26,211 $ 25,531    
accounts receivable, net 24,577 23,481    
Allowance for doubtful accounts [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
valuation allowance, balance (414) (1,088) $ (851) $ (573)
Reserve for returns and allowances and discounts [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
valuation allowance, balance $ (1,220) $ (962) $ (738) $ (479)