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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
3 Months Ended
Jul. 30, 2017
Jul. 31, 2016
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ (1,220) $ (962)
Provision for returns, allowances and discounts (628) (919)
Credits issued 765 752
Ending balance $ (1,083) $ (1,129)