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Accounts Receivable - Allowance for Returns and Allowances and Discounts (Detail) - Reserve for returns and allowances and discounts [Member] - USD ($)
$ in Thousands
12 Months Ended
Apr. 28, 2019
Apr. 29, 2018
Apr. 30, 2017
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning balance $ (1,433) $ (1,220) $ (962)
provision for returns and allowances and discounts (2,180) (3,295) (3,061)
credits issued 2,242 3,082 2,803
Ending balance (226) $ (1,433) $ (1,220)
Adjustments Due to ASC 606 Adoption [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Adoption of ASC Topic 606 $ 1,145