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Accounts Receivable (Detail) - USD ($)
$ in Thousands
Jan. 28, 2018
Apr. 30, 2017
Jan. 29, 2017
May 01, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Customers $ 27,666 $ 26,211 $ 24,339  
Accounts receivable, net 26,097 24,577 [1] 22,726  
Allowance for doubtful accounts [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation allowance, balance (357) (414) (397) $ (1,088)
Reserve for returns and allowances and discounts [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation allowance, balance $ (1,212) $ (1,220) $ (1,216) $ (962)
[1] Derived from audited financial statements.