Segment Information - Capital Expenditures and Depreciation Expense for Operating Segments (Detail) - USD ($) $ in Thousands		12 Months Ended
		Apr. 28, 2024	Apr. 30, 2023	May 01, 2022
Segment Reporting Information [Line Items]
Capital expenditures	[1]	$ 4,000	$ 1,689	$ 5,821
Depreciation expense		6,521	6,845	6,994
Business Segments [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Capital expenditures	[1]	3,474	1,125	3,383
Depreciation expense		5,883	6,050	6,200
Business Segments [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Capital expenditures	[1]	271	467	1,032
Depreciation expense		638	795	794
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Capital expenditures	[1]	$ 255	$ 97	$ 1,406

[1] Capital expenditure amounts are stated on an accrual basis. See the Consolidated Statement of Cash Flows for capital expenditure amounts on a cash basis.