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Fair Value of Financial Instruments - Recurring Basis (Detail) - USD ($) $ in Thousands | Apr. 29, 2018 | Apr. 30, 2017
--- | --- | ---
Premier Money Market Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | $ 6,492 | $ 4,811
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
Intermediate Term Bond Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 747 | 751
Strategic Income Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 619 | 611
Large Blend Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 402 | 365
Growth Allocation Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 169 | 126
Moderate Allocation Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 113 | 88
Other [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 150 | 76
EURO Foreign Exchange Contract [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Liabilities measured at fair value on a recurring basis | 55 |
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 | 6,492 | 4,811
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
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 | 747 | 751
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 | 619 | 611
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 | 402 | 365
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 | 169 | 126
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 | 113 | 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 | 150 | $ 76
Significant other observable inputs - Level 2 [Member] | EURO Foreign Exchange Contract [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Liabilities measured at fair value on a recurring basis | $ 55 |

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity. + References No definition available. + Details
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