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Accounts Receivable - Allowance for Doubtful Accounts (Detail) - Allowance for doubtful accounts [Member] - USD ($)
$ in Thousands
12 Months Ended
May 01, 2016
May 03, 2015
Apr. 27, 2014
Valuation and Qualifying Accounts Disclosure [Line Items]      
beginning balance $ (851) $ (573) $ (780)
provision for bad debts (363) (421) 139
write-offs, net of recoveries 126 143 68
ending balance $ (1,088) $ (851) $ (573)