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Accounts Receivable (Detail) - USD ($)
$ in Thousands
Jan. 29, 2017
May 01, 2016
Jan. 31, 2016
May 03, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Customers $ 24,339 $ 25,531 $ 28,684  
Accounts receivable, net 22,726 23,481 [1] 26,784  
Allowance for doubtful accounts [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation allowance, balance (397) (1,088) (814) $ (851)
Reserve for returns and allowances and discounts [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation allowance, balance $ (1,216) $ (962) $ (1,086) $ (738)
[1] Derived from audited financial statements.