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Fair Value of Financial Instruments - Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Apr. 28, 2019	Apr. 29, 2018
Premier Money Market Fund [Member]
Assets:
Investments at fair value	$ 6,639	$ 6,492
Low Duration Bond Fund [Member]
Assets:
Investments at fair value		1,085
Intermediate Term Bond Fund [Member]
Assets:
Investments at fair value		747
Strategic Income Fund [Member]
Assets:
Investments at fair value		619
Large Blend Fund [Member]
Assets:
Investments at fair value		402
Growth Allocation Fund [Member]
Assets:
Investments at fair value	203	169
Moderate Allocation Fund [Member]
Assets:
Investments at fair value	127	113
Other [Member]
Assets:
Investments at fair value	112	150
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	6,639	6,492
Quoted prices in active markets for identical assets - Level 1 [Member] | Low Duration Bond Fund [Member]
Assets:
Investments at fair value		1,085
Quoted prices in active markets for identical assets - Level 1 [Member] | Intermediate Term Bond Fund [Member]
Assets:
Investments at fair value		747
Quoted prices in active markets for identical assets - Level 1 [Member] | Strategic Income Fund [Member]
Assets:
Investments at fair value		619
Quoted prices in active markets for identical assets - Level 1 [Member] | Large Blend Fund [Member]
Assets:
Investments at fair value		402
Quoted prices in active markets for identical assets - Level 1 [Member] | Growth Allocation Fund [Member]
Assets:
Investments at fair value	203	169
Quoted prices in active markets for identical assets - Level 1 [Member] | Moderate Allocation Fund [Member]
Assets:
Investments at fair value	127	113
Quoted prices in active markets for identical assets - Level 1 [Member] | Other [Member]
Assets:
Investments at fair value	$ 112	150
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 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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