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Fair Value - Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands | Jan. 26, 2025 | Apr. 28, 2024 | Jan. 28, 2024
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U.S. Government Money Market Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value | $ 6,606 | $ 6,910 | $ 6,995
Growth Allocation Mutual Funds [Member] |  |  |
Assets: |  |  |
Investments at fair value | 835 | 691 | 656
S&P 500 Index Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value | 275 | 176 | 156
Other [Member] |  |  |
Assets: |  |  |
Investments at fair value | 287 | 228 | 213
Quoted prices in active markets for identical assets - Level 1 [Member] | U.S. Government Money Market Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value | 6,606 | 6,910 | 6,995
Quoted prices in active markets for identical assets - Level 1 [Member] | Growth Allocation Mutual Funds [Member] |  |  |
Assets: |  |  |
Investments at fair value | 835 | 691 | 656
Quoted prices in active markets for identical assets - Level 1 [Member] | S&P 500 Index Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value | 275 | 176 | 156
Quoted prices in active markets for identical assets - Level 1 [Member] | Other [Member] |  |  |
Assets: |  |  |
Investments at fair value | $ 287 | $ 228 | $ 213

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