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Accounts Receivable - Allowance for Doubtful Accounts (Detail) (Allowance for doubtful accounts [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Apr. 27, 2014
Apr. 28, 2013
Apr. 29, 2012
Allowance for doubtful accounts [Member]
     
Valuation and Qualifying Accounts Disclosure [Line Items]      
beginning balance $ (780) $ (567) $ (776)
provision for bad debts 139 (283) (67)
write-offs, net of recoveries 68 70 276
ending balance $ (573) $ (780) $ (567)