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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

X

- 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.

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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.

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