Accounts Receivable - Allowance for Returns and Allowances and Discounts (Detail) - USD ($) $ in Thousands		12 Months Ended
		May 02, 2021	May 03, 2020	Apr. 28, 2019
Valuation and Qualifying Accounts Disclosure [Line Items]
Change in estimate during the current year	[1]	$ 558	$ 119	$ 88
Reserve for returns and allowances and discounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
beginning balance		(84)	(226)	(1,433)
provision for returns and allowances and discounts		(1,665)	(1,603)	(2,180)
credits issued and discounts taken		1,611	1,745	2,242
ending balance		$ (138)	$ (84)	(226)
Reserve for returns and allowances and discounts [Member] | Adjustments Due to ASC 606 Adoption [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Change in estimate during the current year				$ 1,145

[1] Amount represents changes in our U.S. net deferred income tax asset balances during the current year that pertain to (i) income tax provision to return adjustments, (ii) changes in estimates of our U.S. effective income tax rate that pertain to U.S. state income tax rates and apportionment percentages, and (iii) other immaterial items.