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Fair Value of Financial Instruments - Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Aug. 04, 2019	Apr. 28, 2019	Jul. 29, 2018
Premier Money Market Fund [Member]
Assets:
Investments at fair value	$ 6,920	$ 6,639	$ 6,749
Large Blend Fund [Member]
Assets:
Investments at fair value			438
Growth Allocation Fund [Member]
Assets:
Investments at fair value	213	203	180
Moderate Allocation Fund [Member]
Assets:
Investments at fair value	130	127	117
Other [Member]
Assets:
Investments at fair value	84	112	187
Quoted prices in active markets for identical assets - Level 1 [Member] | Premier Money Market Fund [Member]
Assets:
Investments at fair value	6,920	6,639	6,749
Quoted prices in active markets for identical assets - Level 1 [Member] | Large Blend Fund [Member]
Assets:
Investments at fair value			438
Quoted prices in active markets for identical assets - Level 1 [Member] | Growth Allocation Fund [Member]
Assets:
Investments at fair value	213	203	180
Quoted prices in active markets for identical assets - Level 1 [Member] | Moderate Allocation Fund [Member]
Assets:
Investments at fair value	130	127	117
Quoted prices in active markets for identical assets - Level 1 [Member] | Other [Member]
Assets:
Investments at fair value	$ 84	$ 112	$ 187

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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