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Accounts Receivable - Allowance for Returns and Allowances and Discounts Accounts (Detail) (Reserve for returns and allowances and discounts [Member], USD $)
In Thousands, unless otherwise specified
6 Months Ended
Oct. 28, 2012
Oct. 30, 2011
Reserve for returns and allowances and discounts [Member]
   
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ (478) $ (577)
Provision for returns, allowances and discounts (1,551) (1,197)
Credits issued 1,476 1,354
Ending balance $ (553) $ (420)