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Accounts Receivable - Allowance for Doubtful Accounts (Detail) - Allowance for doubtful accounts [Member] - USD ($)
$ in Thousands
6 Months Ended
Nov. 01, 2015
Nov. 02, 2014
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ (851) $ (573)
Provision for bad debts (81) 57
Net write-offs, net of recoveries 106 74
Ending balance $ (826) $ (442)