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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
6 Months Ended
Oct. 29, 2017
Oct. 30, 2016
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning balance $ (1,220) $ (962)
Provision for returns, allowances and discounts (1,330) (1,620)
Credits issued 1,551 1,461
Ending balance $ (999) $ (1,121)