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Fair Value - Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands | Apr. 27, 2025 | Apr. 28, 2024
--- | --- | ---
U.S. Government Money Market Fund [Member] |  |
Assets: |  |
Investments at fair value | $ 5,682 | $ 6,910
Growth Allocation Mutual Funds [Member] |  |
Assets: |  |
Investments at fair value | 808 | 691
S&P 500 Index Fund [Member] |  |
Assets: |  |
Investments at fair value | 275 | 176
Other [Member] |  |
Assets: |  |
Investments at fair value | 282 | 228
Quoted prices in active markets for identical assets - Level 1 [Member] | U.S. Government Money Market Fund [Member] |  |
Assets: |  |
Investments at fair value | 5,682 | 6,910
Quoted prices in active markets for identical assets - Level 1 [Member] | Growth Allocation Mutual Funds [Member] |  |
Assets: |  |
Investments at fair value | 808 | 691
Quoted prices in active markets for identical assets - Level 1 [Member] | S&P 500 Index Fund [Member] |  |
Assets: |  |
Investments at fair value | 275 | 176
Quoted prices in active markets for identical assets - Level 1 [Member] | Other [Member] |  |
Assets: |  |
Investments at fair value | $ 282 | $ 228

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