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Fair Value of Financial Instruments - Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands | Oct. 28, 2018 | Apr. 29, 2018 | Oct. 29, 2017
--- | --- | --- | ---
Premier Money Market Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value | $ 6,943 | $ 6,492 | $ 6,153
Low Duration Bond Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value |  | 1,085 | 1,087
Intermediate Term Bond Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value |  | 747 | 765
Strategic Income Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value |  | 619 | 626
Large Blend Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value | 422 | 402 | 393
Growth Allocation Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value | 175 | 169 | 153
Moderate Allocation Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value | 114 | 113 | 107
Other [Member] |  |  |
Assets: |  |  |
Investments at fair value | 197 | 150 | 115
EURO [Member] | Foreign Currency Contract [Member] | Cash Flow Hedge [Member] |  |  |
Liabilities: |  |  |
Derivative liabilities at fair value |  | 55 |
Quoted prices in active markets for identical assets - Level 1 [Member] | Premier Money Market Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value | 6,943 | 6,492 | 6,153
Quoted prices in active markets for identical assets - Level 1 [Member] | Low Duration Bond Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value |  | 1,085 | 1,087
Quoted prices in active markets for identical assets - Level 1 [Member] | Intermediate Term Bond Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value |  | 747 | 765
Quoted prices in active markets for identical assets - Level 1 [Member] | Strategic Income Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value |  | 619 | 626
Quoted prices in active markets for identical assets - Level 1 [Member] | Large Blend Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value | 422 | 402 | 393
Quoted prices in active markets for identical assets - Level 1 [Member] | Growth Allocation Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value | 175 | 169 | 153
Quoted prices in active markets for identical assets - Level 1 [Member] | Moderate Allocation Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value | 114 | 113 | 107
Quoted prices in active markets for identical assets - Level 1 [Member] | Other [Member] |  |  |
Assets: |  |  |
Investments at fair value | $ 197 | 150 | $ 115
Significant other observable inputs - Level 2 [Member] | EURO [Member] | Foreign Currency Contract [Member] | Cash Flow Hedge [Member] |  |  |
Liabilities: |  |  |
Derivative liabilities at fair value |  | $ 55 |

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