Accounts Receivable - Summary of Accounts Receivable (Detail) - USD ($) $ in Thousands	May 03, 2020	Apr. 28, 2019		Apr. 29, 2018	Apr. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
customers	$ 25,649	$ 24,370
Accounts receivable, net	25,093	23,751	[1]
Allowance for doubtful accounts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Valuation allowance, balance	(472)	(393)		$ (357)	$ (414)
Allowance for cash discounts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Valuation allowance, balance	(68)	(186)
Allowance for sales returns and allowances [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Valuation allowance, balance	$ (16)	$ (40)

[1] At April 28, 2019, accounts receivable totaled $23.8 million, of which $23.4 million and $378,000 were classified as accounts receivable and within current assets held for sale – discontinued operation, respectively, in the accompanying Consolidated Balance Sheet.