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Fair Value of Financial Instruments - Recurring Basis (Detail) - USD ($) $ in Thousands | Jan. 29, 2017 | May 01, 2016 | Jan. 31, 2016
--- | --- | --- | ---
U.S. Corporate Bonds [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | $ 30,682 |  |
U.S. Corporate Bonds [Member] | Significant other observable inputs - Level 2 [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | 30,682 |  |
Premier Money Market Fund [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | 4,888 | $ 3,404 | $ 3,071
Premier Money Market Fund [Member] | Quoted prices in active markets for identical assets - Level 1 [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | 4,888 | 3,404 | 3,071
Low Duration Bond Fund [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | 1,073 | 1,604 | 1,592
Low Duration Bond Fund [Member] | Quoted prices in active markets for identical assets - Level 1 [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | 1,073 | 1,604 | 1,592
Intermediate Term Bond Fund [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | 739 | 1,154 | 1,116
Intermediate Term Bond Fund [Member] | Quoted prices in active markets for identical assets - Level 1 [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | 739 | 1,154 | 1,116
Strategic Income Fund [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | 598 | 999 | 957
Strategic Income Fund [Member] | Quoted prices in active markets for identical assets - Level 1 [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | 598 | 999 | 957
Limited Term Bond Fund [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis |  | 602 | 594
Limited Term Bond Fund [Member] | Quoted prices in active markets for identical assets - Level 1 [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis |  | 602 | 594
Large Blend Fund [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | 343 | 289 | 254
Large Blend Fund [Member] | Quoted prices in active markets for identical assets - Level 1 [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | 343 | 289 | 254
Growth Allocation Fund [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | 113 | 148 | 128
Growth Allocation Fund [Member] | Quoted prices in active markets for identical assets - Level 1 [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | 113 | 148 | 128
Mid Cap Value Fund [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis |  | 102 | 90
Mid Cap Value Fund [Member] | Quoted prices in active markets for identical assets - Level 1 [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis |  | 102 | 90
Other [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | 61 | 82 | 47
Other [Member] | Quoted prices in active markets for identical assets - Level 1 [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | 61 | $ 82 | $ 47
Moderate Allocation Fund [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | 83 |  |
Moderate Allocation Fund [Member] | Quoted prices in active markets for identical assets - Level 1 [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Assets measured at fair value on a recurring basis | $ 83 |  |

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