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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
9 Months Ended
Jan. 26, 2014
Jan. 27, 2013
Reserve for returns and allowances and discounts [Member]
   
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ (543) $ (478)
Provision for returns, allowances and discounts (1,579) (2,146)
Credits issued 1,574 2,044
Ending balance $ (548) $ (580)