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Accounts Receivable - Allowance for Returns and Allowances and Discounts (Detail) - Reserve for returns and allowances and discounts [Member] - USD ($)
$ in Thousands
9 Months Ended
Jan. 31, 2016
Feb. 01, 2015
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ (738) $ (479)
Provision for returns, allowances and discounts (2,389) (2,065)
Credits issued 2,041 1,815
Ending balance $ (1,086) $ (729)