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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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- 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.

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