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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
6 Months Ended
Nov. 02, 2014
Oct. 27, 2013
Reserve for returns and allowances and discounts [Member]
   
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ (479) $ (543)
Provision for returns, allowances and discounts (1,334) (1,129)
Credits issued 1,218 1,100
Ending balance $ (595) $ (572)