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Fair Value of Financial Instruments - Recurring Basis (Detail) - USD ($) $ in Thousands | Jul. 30, 2017 | Apr. 30, 2017 | Jul. 31, 2016
--- | --- | --- | ---
U.S. Corporate Bonds [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
U.S. Corporate Bonds | $ 30,846 | $ 30,831 |
Premier Money Market Fund [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | 5,991 | 4,811 | $ 3,950
Low Duration Bond Fund [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | 1,085 | 1,081 | 1,073
Intermediate Term Bond Fund [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | 762 | 751 | 754
Strategic Income Fund [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | 622 | 611 | 597
Large Blend Fund [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | 381 | 365 | 310
Growth Allocation Fund [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | 140 | 126 | 97
Moderate Allocation Fund [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | 102 | 88 |
Other [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | 100 | 76 | 147
Mid Cap Value Fund [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis |  |  | 117
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 | 5,991 | 4,811 | 3,950
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 | 1,085 | 1,081 | 1,073
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 | 762 | 751 | 754
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 | 622 | 611 | 597
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 | 381 | 365 | 310
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 | 140 | 126 | 97
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 | 102 | 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 | 100 | 76 | 147
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 |  |  | $ 117
Significant other observable inputs - Level 2 [Member] | U.S. Corporate Bonds [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
U.S. Corporate Bonds | $ 30,846 | $ 30,831 |

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