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Segment Information - Narrative (Detail) | 12 Months Ended
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Apr. 27, 2025 Customer Segment | Apr. 28, 2024 Customer | Apr. 30, 2023 Customer
Segment Reporting Information [Line Items] |  |  |
Number of operating segments | Segment | 2 |  |
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] | srt:ChiefExecutiveOfficerMember |  |
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description | who regularly reviews the financial results of the company on a consolidated and business segment basis for the purpose of evaluating financial and operating performance, allocation of resources to the individual segments noted above, and determining executive compensation. Accordingly, our CODM reviews certain financial metrics that include net sales and (loss) income from operations before unallocated corporate expenses and other items that are not expected to occur on a regular basis (i.e., restructuring activities), as well as: (i) cost of sales, (ii) gross profit, (iii) selling, general, and administrative expenses, including unallocated corporate expenses, (iv) assets used in operations, which generally include accounts receivable, inventory, property, plant, and equipment, right of use assets, and assets held for sale; and (v) capital spending. |  |
Concentration risk, labor subject to collective bargaining arrangements | Hourly employees associated with the mattress fabrics operation located in Quebec, Canada were represented by a local unaffiliated union with a collective bargaining agreement that was set to expire on February 1, 2026. On April 29, 2024 (first quarter of fiscal 2025), our board of directors made a decision to gradually discontinue this operation with the intention to ultimately sell the related building and land. As a result, as of April 27, 2025, there were only six hourly employees remaining to ready the building and land for sale, which such sale to a third party occurred during the first quarter of fiscal 2026. As a result of this sale, the remaining hourly employees were terminated. All hourly employees were provided compensation and benefits in accordance with the collective bargaining agreement noted above. |  |
Currency Concentration Risk [Member] | Net Sales [Member] | USD [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk percentage | 92.00% | 92.00% | 91.00%
Geographic Concentration Risk [Member] | Net Sales [Member] | International [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk percentage | 33.00% | 32.00% | 29.00%
Customer Concentration Risk [Member] | Net Sales [Member] | Upholstery Fabrics [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk percentage | 11.00% | 12.00% | 15.00%
Number of major customers | 1 | 1 | 1
Customer Concentration Risk [Member] | Net Sales [Member] | Mattress Fabrics [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk percentage | 11.00% |  |
Number of major customers | 1 |  |
Customer Concentration Risk [Member] | Net Sales [Member] | Mattress Fabrics [Member] | Minimum [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of major customers |  | 0 | 0
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Upholstery Fabrics [Member] | Minimum [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of major customers | 0 | 0 |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Mattress Fabrics [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of major customers | 0 | 0 |

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