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Fair Value of Financial Instruments - Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Oct. 28, 2018	Apr. 29, 2018	Oct. 29, 2017
Premier Money Market Fund [Member]
Assets:
Investments at fair value	$ 6,943	$ 6,492	$ 6,153
Low Duration Bond Fund [Member]
Assets:
Investments at fair value		1,085	1,087
Intermediate Term Bond Fund [Member]
Assets:
Investments at fair value		747	765
Strategic Income Fund [Member]
Assets:
Investments at fair value		619	626
Large Blend Fund [Member]
Assets:
Investments at fair value	422	402	393
Growth Allocation Fund [Member]
Assets:
Investments at fair value	175	169	153
Moderate Allocation Fund [Member]
Assets:
Investments at fair value	114	113	107
Other [Member]
Assets:
Investments at fair value	197	150	115
EURO [Member] | Foreign Currency Contract [Member] | Cash Flow Hedge [Member]
Liabilities:
Derivative liabilities at fair value		55
Quoted prices in active markets for identical assets - Level 1 [Member] | Premier Money Market Fund [Member]
Assets:
Investments at fair value	6,943	6,492	6,153
Quoted prices in active markets for identical assets - Level 1 [Member] | Low Duration Bond Fund [Member]
Assets:
Investments at fair value		1,085	1,087
Quoted prices in active markets for identical assets - Level 1 [Member] | Intermediate Term Bond Fund [Member]
Assets:
Investments at fair value		747	765
Quoted prices in active markets for identical assets - Level 1 [Member] | Strategic Income Fund [Member]
Assets:
Investments at fair value		619	626
Quoted prices in active markets for identical assets - Level 1 [Member] | Large Blend Fund [Member]
Assets:
Investments at fair value	422	402	393
Quoted prices in active markets for identical assets - Level 1 [Member] | Growth Allocation Fund [Member]
Assets:
Investments at fair value	175	169	153
Quoted prices in active markets for identical assets - Level 1 [Member] | Moderate Allocation Fund [Member]
Assets:
Investments at fair value	114	113	107
Quoted prices in active markets for identical assets - Level 1 [Member] | Other [Member]
Assets:
Investments at fair value	$ 197	150	$ 115
Significant other observable inputs - Level 2 [Member] | EURO [Member] | Foreign Currency Contract [Member] | Cash Flow Hedge [Member]
Liabilities:
Derivative liabilities at fair value		$ 55

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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