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Accounts Receivable - Allowance for Doubtful Accounts (Detail) - Allowance for doubtful accounts [Member] - USD ($)
$ in Thousands
9 Months Ended
Jan. 31, 2016
Feb. 01, 2015
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ (851) $ (573)
Provision for bad debts (93) (20)
Net write-offs, net of recoveries 130 144
Ending balance $ (814) $ (449)