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Accounts Receivable - Allowance for Doubtful Accounts (Detail) - Allowance for doubtful accounts [Member] - USD ($)
$ in Thousands
12 Months Ended
May. 03, 2015
Apr. 27, 2014
Apr. 28, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]      
beginning balance $ (573) $ (780) $ (567)
provision for bad debts (421) 139 (283)
write-offs, net of recoveries 143 68 70
ending balance $ (851) $ (573) $ (780)