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Accounts Receivable - Summary of Accounts Receivable (Detail) - USD ($) | Apr. 30, 2023 | May 01, 2022 | May 02, 2021 | May 03, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
customers | $ 25,244,000 | $ 22,613,000 |  |
Accounts receivable, net | 24,778,000 | 22,226,000 |  |
Allowance for doubtful accounts [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Valuation allowance, balance | (342,000) | (292,000) | $ (591,000) | $ (472,000)
Allowance for cash discounts [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Valuation allowance, balance | (96,000) | (74,000) |  |
Allowance for sales returns and allowances [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Valuation allowance, balance | $ (28,000) | $ (21,000) |  |

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