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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