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Accounts Receivable (Detail) - USD ($)
$ in Thousands
Oct. 29, 2017
Apr. 30, 2017
Oct. 30, 2016
May 01, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Customers $ 25,593 $ 26,211 $ 20,580  
Accounts receivable, net 24,220 24,577 [1] 19,039  
Allowance for doubtful accounts [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation allowance, balance (374) (414) (420) $ (1,088)
Reserve for returns and allowances and discounts [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation allowance, balance $ (999) $ (1,220) $ (1,121) $ (962)
[1] Derived from audited financial statements.