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Income Taxes - Summary of Change in Valuation Allowances Against U.S. Net Deferred Income Tax Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 27, 2025 | Apr. 28, 2024 | Apr. 30, 2023
Income Tax Disclosure [Abstract] |  |  |  |
beginning balance |  | $ 22,004 | $ 18,675 | $ 11,857
change in valuation allowance associated with current year earnings |  | 4,162 | 3,318 | 7,252
change in estimate during current year | [1] | 137 | 11 | (434)
ending balance |  | $ 26,303 | $ 22,004 | $ 18,675
[1] | Amounts represent changes in our U.S. net deferred income tax asset balances during the current year that pertain to: (i) income tax provision to return adjustments; (ii) changes in estimates of our U.S. effective income tax rate that pertain to U.S. state income tax rates and apportionment percentages, (iii) expiration of certain U.S. state loss carryforwards; and (iv) other immaterial items.

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- Definition Valuation allowance change associated with current year earnings. + References No definition available. + Details
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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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Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4 + Details
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