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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. 30, 2017
May 01, 2016
May 03, 2015
Valuation and Qualifying Accounts Disclosure [Line Items]      
beginning balance $ (962) $ (738) $ (479)
provision for returns and allowances and discounts (3,061) (2,825) (2,733)
credits issued 2,803 2,601 2,474
ending balance $ (1,220) $ (962) $ (738)