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Accounts Receivable - Summary of Accounts Receivable (Detail) - USD ($) | Apr. 28, 2024 | Apr. 30, 2023 | May 01, 2022 | May 02, 2021
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
customers | $ 21,660,000 | $ 25,244,000 |  |
Accounts receivable, net | 21,138,000 | 24,778,000 |  |
Allowance for doubtful accounts [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Valuation allowance, balance | (356,000) | (342,000) | $ (292,000) | $ (591,000)
Allowance for cash discounts [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Valuation allowance, balance | (113,000) | (96,000) |  |
Allowance for sales returns and allowances [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Valuation allowance, balance | $ (53,000) | $ (28,000) |  |

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