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Accounts Receivable - Summary of Accounts Receivable (Detail) - USD ($) $ in Thousands | May 02, 2021 | May 03, 2020 | Apr. 28, 2019 | Apr. 29, 2018
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
customers | $ 38,455 | $ 25,649 |  |
Accounts receivable, net | 37,726 | 25,093 |  |
Allowance for doubtful accounts [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Valuation allowance, balance | (591) | (472) | $ (393) | $ (357)
Allowance for cash discounts [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Valuation allowance, balance | (124) | (68) |  |
Allowance for sales returns and allowances [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Valuation allowance, balance | $ (14) | $ (16) |  |

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