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Fair Value - Narrative (Detail) - USD ($) | Jan. 26, 2025 | Apr. 28, 2024 | Jan. 28, 2024
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Investments (Rabbi Trust) - available for sale | $ 8,000,000 | $ 8,000,000 |  | $ 8,000,000
Short-term investments (Rabbi Trust) - available for sale | 1,753,000 | 903,000 | [1] | 937,000
Long-term investments (Rabbi Trust) - available for sale | 6,200,000 | 7,100,000 |  | 7,100,000
Accumulated unrealized gain (loss) on investments | $ 216,000 | $ 118,000 |  | $ 88,000
Investment, Type [Extensible Enumeration] | us-gaap:InvestmentsMember | us-gaap:InvestmentsMember |  | us-gaap:InvestmentsMember
[1] | Derived from audited consolidated financial statements.

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