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Fair Value of Financial Instruments - Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Jul. 29, 2018	Apr. 29, 2018	Jul. 30, 2017
Premier Money Market Fund [Member]
Assets:
Investments at fair value	$ 6,749	$ 6,492	$ 5,991
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	762
Strategic Income Fund [Member]
Assets:
Investments at fair value		619	622
Large Blend Fund [Member]
Assets:
Investments at fair value	438	402	381
Growth Allocation Fund [Member]
Assets:
Investments at fair value	180	169	140
Moderate Allocation Fund [Member]
Assets:
Investments at fair value	117	113	102
Other [Member]
Assets:
Investments at fair value	187	150	100
EURO [Member] | Foreign Currency Contract [Member] | Cash Flow Hedge [Member]
Liabilities:
Derivative liabilities at fair value	40	55
Quoted prices in active markets for identical assets - Level 1 [Member] | Premier Money Market Fund [Member]
Assets:
Investments at fair value	6,749	6,492	5,991
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	762
Quoted prices in active markets for identical assets - Level 1 [Member] | Strategic Income Fund [Member]
Assets:
Investments at fair value		619	622
Quoted prices in active markets for identical assets - Level 1 [Member] | Large Blend Fund [Member]
Assets:
Investments at fair value	438	402	381
Quoted prices in active markets for identical assets - Level 1 [Member] | Growth Allocation Fund [Member]
Assets:
Investments at fair value	180	169	140
Quoted prices in active markets for identical assets - Level 1 [Member] | Moderate Allocation Fund [Member]
Assets:
Investments at fair value	117	113	102
Quoted prices in active markets for identical assets - Level 1 [Member] | Other [Member]
Assets:
Investments at fair value	187	150	$ 100
Significant other observable inputs - Level 2 [Member] | EURO [Member] | Foreign Currency Contract [Member] | Cash Flow Hedge [Member]
Liabilities:
Derivative liabilities at fair value	$ 40	$ 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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