2019 Upholstery Fabrics Restructuring Plan - Summary of Restructuring Credit and Related Charges Associated with 2019 Upholstery Fabrics Restructuring Plan (Parenthetical) (Detail) - USD ($)	12 Months Ended
May 03, 2020	Apr. 28, 2019
Cost of Sales [Member]
Restructuring Related Charges		$ 2,300,000
Selling, General and Administrative Expenses [Member]
Restructuring Related Charges		40,000
Upholstery Fabrics [Member]
Restructuring credit	$ 70,000	825,000
Upholstery Fabrics [Member] \| Cost of Sales [Member]
Restructuring Related Charges		2,300,000
Upholstery Fabrics [Member] \| Selling, General and Administrative Expenses [Member]
Restructuring Related Charges		$ 40,000

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration