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Fair Value of Financial Instruments - Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Jan. 27, 2019	Apr. 29, 2018	Jan. 28, 2018
Premier Money Market Fund [Member]
Assets:
Investments at fair value	$ 6,433	$ 6,492	$ 6,287
Low Duration Bond Fund [Member]
Assets:
Investments at fair value		1,085	1,085
Intermediate Term Bond Fund [Member]
Assets:
Investments at fair value		747	759
Strategic Income Fund [Member]
Assets:
Investments at fair value		619	628
Large Blend Fund [Member]
Assets:
Investments at fair value		402	431
Growth Allocation Fund [Member]
Assets:
Investments at fair value	184	169	171
Moderate Allocation Fund [Member]
Assets:
Investments at fair value	119	113	114
Other [Member]
Assets:
Investments at fair value	98	150	173
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	6,433	6,492	6,287
Quoted prices in active markets for identical assets - Level 1 [Member] | Low Duration Bond Fund [Member]
Assets:
Investments at fair value		1,085	1,085
Quoted prices in active markets for identical assets - Level 1 [Member] | Intermediate Term Bond Fund [Member]
Assets:
Investments at fair value		747	759
Quoted prices in active markets for identical assets - Level 1 [Member] | Strategic Income Fund [Member]
Assets:
Investments at fair value		619	628
Quoted prices in active markets for identical assets - Level 1 [Member] | Large Blend Fund [Member]
Assets:
Investments at fair value		402	431
Quoted prices in active markets for identical assets - Level 1 [Member] | Growth Allocation Fund [Member]
Assets:
Investments at fair value	184	169	171
Quoted prices in active markets for identical assets - Level 1 [Member] | Moderate Allocation Fund [Member]
Assets:
Investments at fair value	119	113	114
Quoted prices in active markets for identical assets - Level 1 [Member] | Other [Member]
Assets:
Investments at fair value	$ 98	150	$ 173
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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