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Income Taxes - Summary of Valuation Allowances Against Net Deferred Income Tax Assets (Detail) - USD ($) $ in Thousands | Jan. 26, 2025 | Apr. 28, 2024 | Jan. 28, 2024
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Valuation Allowance [Line Items] |  |  |
Valuation allowance | $ 26,292 | $ 22,004 | $ 21,492
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 | $ 23,962 | $ 19,674 | $ 19,162

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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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