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Intangible Assets - Narrative (Detail) - USD ($) | 12 Months Ended | 33 Months Ended |
--- | --- | --- | ---
Apr. 27, 2025 | Apr. 28, 2024 | Apr. 30, 2023 | Apr. 27, 2025 | May 01, 2022
Intangible Assets [Line Items] |  |  |  |  |
Impairment charges of tradename | $ 540,000 |  |  |  |
Gross carrying amount of customer relationships | 3,100,000 | $ 3,100,000 |  | $ 3,100,000 |
Incurred operating losses | (18,377,000) | (11,308,000) | $ (28,478,000) |  |
Gross carrying amount of non-compete agreement | 2,000,000.0 | 2,000,000.0 |  | 2,000,000.0 |
Property, plant and equipment, net | 24,836,000 | 33,182,000 |  | 24,836,000 |
Right of use assets | 5,908,000 | 6,203,000 |  | 5,908,000 |
Customer Relationships [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Finite-lived intangible assets, net | 734,000 | 1,035,000 | 1,335,000 | 734,000 | $ 1,636,000
Accumulated amortization | 2,400,000 | 2,100,000 |  | 2,400,000 |
Remaining amortization expense for the fiscal year | 301,000 |  |  | 301,000 |
Remaining amortization expense for the second fiscal year | 280,000 |  |  | 280,000 |
Remaining amortization expense for the third fiscal year | 51,000 |  |  | 51,000 |
Remaining amortization expense for the fourth fiscal year | 51,000 |  |  | 51,000 |
Remaining amortization expense for the fifth fiscal year | $ 51,000 |  |  | $ 51,000 |
Weighted average remaining amortization period | 3 years |  |  | 3 years |
Customer Relationships [Member] | Minimum [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Useful life | 9 years |  |  | 9 years |
Customer Relationships [Member] | Maximum [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Useful life | 17 years |  |  | 17 years |
Non-Compete Agreement [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Useful life | 15 years |  |  | 15 years |
Finite-lived intangible assets, net | $ 226,000 | 301,000 | $ 377,000 | $ 226,000 | $ 452,000
Accumulated amortization | 1,800,000 | $ 1,700,000 |  | 1,800,000 |
Remaining amortization expense for the fiscal year | 76,000 |  |  | 76,000 |
Remaining amortization expense for the second fiscal year | 76,000 |  |  | 76,000 |
Remaining amortization expense for the third fiscal year | $ 74,000 |  |  | $ 74,000 |
Weighted average remaining amortization period | 3 years |  |  | 3 years |
Mattress Asset Group [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Carrying amount of asset group, net | $ 23,900,000 |  |  | $ 23,900,000 |
Impairment charge | 0 |  |  |  |
Mattress Asset Group [Member] | Mattress Fabrics [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Incurred operating losses |  |  |  | 36,400,000 |
Mattress Asset Group [Member] | Customer Relationships [Member] | Mattress Fabrics [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Finite-lived intangible assets, net | 255,000 |  |  | 255,000 |
Mattress Asset Group [Member] | Non-Compete Agreement [Member] | Mattress Fabrics [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Finite-lived intangible assets, net | 226,000 |  |  | 226,000 |
Mattress Asset Group [Member] | Property, Plant and Equipment [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Property, plant and equipment, net | 23,300,000 |  |  | 23,300,000 |
Mattress Asset Group [Member] | Right Of Use Assets [Member] |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |
Right of use assets | $ 125,000 |  |  | $ 125,000 |

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