Allowance for Doubtful Accounts - Summary of the Activity in the Allowance for Doubtful Accounts (Detail) - Allowance for doubtful accounts [Member] - USD ($)	9 Months Ended
	Jan. 30, 2022	Jan. 31, 2021
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	$ 591,000	$ 472,000
Provision for bad debts	86,000	163,000
Write-offs, net of recoveries	(34,000)
Ending balance	$ 643,000	$ 635,000