Accounts Receivable - Allowance for Doubtful Accounts (Detail) - Allowance for doubtful accounts [Member] - USD ($) $ in Thousands	12 Months Ended
	May 02, 2021	May 03, 2020	Apr. 28, 2019
Valuation and Qualifying Accounts Disclosure [Line Items]
beginning balance	$ (472)	$ (393)	$ (357)
provision for bad debts	(119)	(79)	(84)
write-offs, net of recoveries			48
ending balance	$ (591)	$ (472)	$ (393)