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Fair Value - Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands | May 01, 2022 | May 02, 2021
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U.S. Government Money Market Fund [Member] |  |
Assets: |  |
Investments at fair value | $ 8,683 |
U.S. Government Money Market Fund [Member] | Quoted prices in active markets for identical assets - Level 1 [Member] |  |
Assets: |  |
Investments at fair value | 8,683 |
Premier Money Market Fund [Member] |  |
Assets: |  |
Investments at fair value |  | $ 7,879
Premier Money Market Fund [Member] | Quoted prices in active markets for identical assets - Level 1 [Member] |  |
Assets: |  |
Investments at fair value |  | 7,879
Short Term Bond Mutual Funds [Member] |  |
Assets: |  |
Investments at fair value |  | 4,101
Short Term Bond Mutual Funds [Member] | Quoted prices in active markets for identical assets - Level 1 [Member] |  |
Assets: |  |
Investments at fair value |  | 4,101
Short Duration Inflation Protected Mutual Fund [Member] |  |
Assets: |  |
Investments at fair value |  | 722
Short Duration Inflation Protected Mutual Fund [Member] | Quoted prices in active markets for identical assets - Level 1 [Member] |  |
Assets: |  |
Investments at fair value |  | 722
Mortgage Securities Mutual Fund [Member] |  |
Assets: |  |
Investments at fair value |  | 719
Mortgage Securities Mutual Fund [Member] | Quoted prices in active markets for identical assets - Level 1 [Member] |  |
Assets: |  |
Investments at fair value |  | 719
Growth Allocation Mutual Funds [Member] |  |
Assets: |  |
Investments at fair value | 435 | 339
Growth Allocation Mutual Funds [Member] | Quoted prices in active markets for identical assets - Level 1 [Member] |  |
Assets: |  |
Investments at fair value | 435 | 339
Moderate Allocation Mutual Fund [Member] |  |
Assets: |  |
Investments at fair value | 81 | 86
Moderate Allocation Mutual Fund [Member] | Quoted prices in active markets for identical assets - Level 1 [Member] |  |
Assets: |  |
Investments at fair value | 81 | 86
Other [Member] |  |
Assets: |  |
Investments at fair value | 158 | 111
Other [Member] | Quoted prices in active markets for identical assets - Level 1 [Member] |  |
Assets: |  |
Investments at fair value | $ 158 | $ 111

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