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Fair Value of Financial Instruments - Recurring Basis (Detail) - USD ($) $ in Thousands | May. 03, 2015 | Apr. 27, 2014
--- | --- | ---
Limited Term Bond Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | $ 3,107 | $ 2,576
Premier Money Market Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 2,285 | 755
Intermediate Term Bond Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 2,181 | 1,641
Low Duration Bond Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 2,096 | 2,077
Strategic Income Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 1,008 |
Growth Allocation Fund [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 85 |
Other [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets measured at fair value on a recurring basis | 45 | 10
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 | 3,107 | 2,576
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 | 2,285 | 755
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 | 2,181 | 1,641
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 | 2,096 | 2,077
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 | 1,008 |
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 | 85 |
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 | $ 45 | $ 10

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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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Balance Type: | debit
Period Type: | instant

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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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- Details
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