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Income Taxes - Summary of Valuation Allowances Against Net Deferred Income Tax Assets (Detail) - USD ($) $ in Thousands | Oct. 29, 2023 | Apr. 30, 2023 | Oct. 30, 2022
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Valuation Allowance [Line Items] |  |  |
Valuation allowance | $ 20,169 | $ 18,675 | $ 16,288
U.S. Capital Loss Carry Forwards [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Valuation allowance | 2,330 | 2,330 | 2,330
U.S. Federal and State [Member] | Deferred Income Tax Assets [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Valuation allowance | $ 17,839 | $ 16,345 | $ 13,958

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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