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Segment Information - Balance Sheet Information by Operating Segments (Parenthetical) (Detail) - USD ($) | Apr. 30, 2023 | May 01, 2022
--- | --- | ---
Segment Reporting Information [Line Items] |  |
property, plant, and equipment | $ 36,111,000 | $ 41,702,000
Right of use assets | 8,191,000 | 15,577,000
Business Segments [Member] | Mattress Fabrics [Member] |  |
Segment Reporting Information [Line Items] |  |
property, plant, and equipment | 33,749,000 | 38,731,000
Right of use assets | 2,308,000 | 3,469,000
Business Segments [Member] | Upholstery Fabrics [Member] |  |
Segment Reporting Information [Line Items] |  |
property, plant, and equipment | 1,671,000 | 2,030,000
Right of use assets | 2,618,000 | 8,124,000
Business Segments [Member] | United States [Member] | Mattress Fabrics [Member] |  |
Segment Reporting Information [Line Items] |  |
property, plant, and equipment | 22,700,000 | 25,600,000
Right of use assets |  | 1,200,000
Business Segments [Member] | United States [Member] | Upholstery Fabrics [Member] |  |
Segment Reporting Information [Line Items] |  |
property, plant, and equipment | 974,000 | 1,000,000.0
Right of use assets | 1,100,000 | 1,800,000
Business Segments [Member] | Canada [Member] | Mattress Fabrics [Member] |  |
Segment Reporting Information [Line Items] |  |
property, plant, and equipment | 10,400,000 | 12,400,000
Right of use assets | 776,000 | 291,000
Business Segments [Member] | Haiti [Member] | Mattress Fabrics [Member] |  |
Segment Reporting Information [Line Items] |  |
property, plant, and equipment | 608,000 | 757,000
Right of use assets | 1,500,000 | 2,000,000.0
Business Segments [Member] | Haiti [Member] | Upholstery Fabrics [Member] |  |
Segment Reporting Information [Line Items] |  |
property, plant, and equipment | 592,000 | 756,000
Right of use assets |  | 2,600,000
Business Segments [Member] | China [Member] | Upholstery Fabrics [Member] |  |
Segment Reporting Information [Line Items] |  |
property, plant, and equipment | 105,000 | 255,000
Right of use assets | 1,500,000 | 3,700,000
Unallocated Corporate [Member] |  |
Segment Reporting Information [Line Items] |  |
property, plant, and equipment | 691,000 | 941,000
Right of use assets | 3,265,000 | 3,984,000
Unallocated Corporate [Member] | United States [Member] |  |
Segment Reporting Information [Line Items] |  |
property, plant, and equipment | 691,000 | 941,000
Right of use assets | $ 3,300,000 | $ 4,000,000.0

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