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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, unless otherwise specified
12 Months Ended
Apr. 27, 2014
Apr. 28, 2013
Apr. 29, 2012
Reserve for returns and allowances and discounts [Member]
     
Valuation and Qualifying Accounts Disclosure [Line Items]      
beginning balance $ (543) $ (478) $ (577)
provision for returns and allowances and discounts (2,094) (2,454) (2,694)
credits issued 2,158 2,389 2,793
ending balance $ (479) $ (543) $ (478)