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Fair Value of Financial Instruments - Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands | Jul. 29, 2018 | Apr. 29, 2018 | Jul. 30, 2017
--- | --- | --- | ---
Premier Money Market Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value | $ 6,749 | $ 6,492 | $ 5,991
Low Duration Bond Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value |  | 1,085 | 1,085
Intermediate Term Bond Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value |  | 747 | 762
Strategic Income Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value |  | 619 | 622
Large Blend Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value | 438 | 402 | 381
Growth Allocation Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value | 180 | 169 | 140
Moderate Allocation Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value | 117 | 113 | 102
Other [Member] |  |  |
Assets: |  |  |
Investments at fair value | 187 | 150 | 100
EURO [Member] | Foreign Currency Contract [Member] | Cash Flow Hedge [Member] |  |  |
Liabilities: |  |  |
Derivative liabilities at fair value | 40 | 55 |
Quoted prices in active markets for identical assets - Level 1 [Member] | Premier Money Market Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value | 6,749 | 6,492 | 5,991
Quoted prices in active markets for identical assets - Level 1 [Member] | Low Duration Bond Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value |  | 1,085 | 1,085
Quoted prices in active markets for identical assets - Level 1 [Member] | Intermediate Term Bond Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value |  | 747 | 762
Quoted prices in active markets for identical assets - Level 1 [Member] | Strategic Income Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value |  | 619 | 622
Quoted prices in active markets for identical assets - Level 1 [Member] | Large Blend Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value | 438 | 402 | 381
Quoted prices in active markets for identical assets - Level 1 [Member] | Growth Allocation Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value | 180 | 169 | 140
Quoted prices in active markets for identical assets - Level 1 [Member] | Moderate Allocation Fund [Member] |  |  |
Assets: |  |  |
Investments at fair value | 117 | 113 | 102
Quoted prices in active markets for identical assets - Level 1 [Member] | Other [Member] |  |  |
Assets: |  |  |
Investments at fair value | 187 | 150 | $ 100
Significant other observable inputs - Level 2 [Member] | EURO [Member] | Foreign Currency Contract [Member] | Cash Flow Hedge [Member] |  |  |
Liabilities: |  |  |
Derivative liabilities at fair value | $ 40 | $ 55 |

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