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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. 27, 2019	Jan. 28, 2018
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance		$ (1,433)	$ (1,220)
Provision for returns, allowances and discounts		(1,612)	(2,332)
Credits issued		1,682	2,340
Ending balance		(218)	$ (1,212)
Adjustments Due to ASC 606 Adoption [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Adoption of ASC Topic 606	[1]	$ 1,145
[1] Due to the adoption of ASC Topic 606, Revenue from Contracts with Customers, certain balance sheet reclassifications were required regarding our allowance for sales returns and allowances for the current year's presentation only. See Note 5 to the consolidated financial statements for required balance sheet disclosures associated with the adoption of ASC Topic 606.

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Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
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-SubTopic 10
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