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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
May. 03, 2015
Apr. 27, 2014
Apr. 28, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]      
beginning balance $ (479) $ (543) $ (478)
provision for returns and allowances and discounts (2,733) (2,094) (2,454)
credits issued 2,474 2,158 2,389
ending balance $ (738) $ (479) $ (543)