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Fair Value of Financial Instruments - Recurring Basis (Detail) - USD ($) $ in Thousands | Apr. 30, 2017 | May 01, 2016
--- | --- | ---
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
U.S. Corporate Bonds | $ 30,831 |
U.S. Corporate Bonds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
U.S. Corporate Bonds | 30,831 |
Premier Money Market Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 4,811 | $ 3,404
Low Duration Bond Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 1,081 | 1,604
Intermediate Term Bond Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 751 | 1,154
Strategic Income Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 611 | 999
Large Blend Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 365 | 289
Growth Allocation Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 126 | 148
Moderate Allocation Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 88 |
Other [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 76 | 82
Limited Term Bond Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis |  | 602
Mid Cap Value Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis |  | 102
Quoted prices in active markets for identical assets - Level 1 [Member] | Premier Money Market Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 4,811 | 3,404
Quoted prices in active markets for identical assets - Level 1 [Member] | Low Duration Bond Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 1,081 | 1,604
Quoted prices in active markets for identical assets - Level 1 [Member] | Intermediate Term Bond Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 751 | 1,154
Quoted prices in active markets for identical assets - Level 1 [Member] | Strategic Income Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 611 | 999
Quoted prices in active markets for identical assets - Level 1 [Member] | Large Blend Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 365 | 289
Quoted prices in active markets for identical assets - Level 1 [Member] | Growth Allocation Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 126 | 148
Quoted prices in active markets for identical assets - Level 1 [Member] | Moderate Allocation Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 88 |
Quoted prices in active markets for identical assets - Level 1 [Member] | Other [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 76 | 82
Quoted prices in active markets for identical assets - Level 1 [Member] | Limited Term Bond Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis |  | 602
Quoted prices in active markets for identical assets - Level 1 [Member] | Mid Cap Value Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis |  | $ 102
Significant other observable inputs - Level 2 [Member] | U.S. Corporate Bonds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
U.S. Corporate Bonds | $ 30,831 |

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