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Fair Value of Financial Instruments - Recurring Basis (Detail) - USD ($) $ in Thousands	Jan. 28, 2018	Apr. 30, 2017	Jan. 29, 2017
Premier Money Market Fund [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets measured at fair value on a recurring basis	$ 6,287	$ 4,811	$ 4,888
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	1,073
Intermediate Term Bond Fund [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets measured at fair value on a recurring basis	759	751	739
Strategic Income Fund [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets measured at fair value on a recurring basis	628	611	598
Large Blend Fund [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets measured at fair value on a recurring basis	431	365	343
Growth Allocation Fund [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets measured at fair value on a recurring basis	171	126	113
Moderate Allocation Fund [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets measured at fair value on a recurring basis	114	88	83
Other [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets measured at fair value on a recurring basis	173	76	61
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	6,287	4,811	4,888
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	1,073
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	759	751	739
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	628	611	598
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	431	365	343
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	171	126	113
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	114	88	83
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	$ 173	$ 76	$ 61

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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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- Definition

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