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Intangible Assets - Narrative (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Oct. 30, 2022
Apr. 28, 2024
Apr. 30, 2023
May 01, 2022
May 02, 2021
Intangible Assets [Line Items]          
Gross carrying amount of customer relationships   $ 3,100,000 $ 3,100,000    
Gross carrying amount of non-compete agreement   2,000,000.0 2,000,000.0    
Property, plant and equipment, net   33,182,000 36,111,000    
Right of use assets   6,203,000 8,191,000    
Incurred operating losses   (11,308,000) (28,478,000) $ 678,000  
Asset impairment charges   0 0 0  
Impairment charges of tradename   0      
Customer Relationships [Member]          
Intangible Assets [Line Items]          
Accumulated amortization   2,100,000 1,800,000    
Remaining amortization expense for the fiscal year   301,000      
Remaining amortization expense for the second fiscal year   301,000      
Remaining amortization expense for the third fiscal year   279,000      
Remaining amortization expense for the fourth fiscal year   52,000      
Remaining amortization expense for the fifth fiscal year   51,000      
Remaining amortization expense for the fiscal year thereafter   $ 51,000      
Weighted average remaining amortization period   3 years 9 months 18 days      
Finite-lived intangible assets, net   $ 1,035,000 1,335,000 1,636,000 $ 1,937,000
Customer Relationships [Member] | Minimum [Member]          
Intangible Assets [Line Items]          
Useful life   9 years      
Customer Relationships [Member] | Maximum [Member]          
Intangible Assets [Line Items]          
Useful life   17 years      
Non-Compete Agreement [Member]          
Intangible Assets [Line Items]          
Useful life   15 years      
Accumulated amortization   $ 1,700,000 1,600,000    
Remaining amortization expense for the fiscal year   76,000      
Remaining amortization expense for the second fiscal year   76,000      
Remaining amortization expense for the third fiscal year   76,000      
Remaining amortization expense for the fourth fiscal year   $ 73,000      
Weighted average remaining amortization period   4 years      
Finite-lived intangible assets, net   $ 301,000 $ 377,000 $ 452,000 $ 527,000
Read Window Products, LLC [Member]          
Intangible Assets [Line Items]          
Impairment charge   0      
Carrying amount of asset group, net   1,800,000      
Read Window Products, LLC [Member] | Customer Relationships [Member]          
Intangible Assets [Line Items]          
Finite-lived intangible assets, net   728,000      
Read Window Products, LLC [Member] | Property, Plant and Equipment [Member]          
Intangible Assets [Line Items]          
Property, plant and equipment, net   390,000      
Read Window Products, LLC [Member] | Right Of Use Assets [Member]          
Intangible Assets [Line Items]          
Right of use assets   725,000      
Mattress Asset Group [Member]          
Intangible Assets [Line Items]          
Impairment charge   0      
Carrying amount of asset group, net   33,700,000      
Mattress Asset Group [Member] | Property, Plant and Equipment [Member]          
Intangible Assets [Line Items]          
Property, plant and equipment, net   31,500,000      
Mattress Asset Group [Member] | Right Of Use Assets [Member]          
Intangible Assets [Line Items]          
Right of use assets   1,600,000      
Mattress Asset Group [Member] | Mattress Fabrics [Member]          
Intangible Assets [Line Items]          
Incurred operating losses $ 22,600,000        
Mattress Asset Group [Member] | Mattress Fabrics [Member] | Customer Relationships [Member]          
Intangible Assets [Line Items]          
Finite-lived intangible assets, net   306,000      
Mattress Asset Group [Member] | Mattress Fabrics [Member] | Non-Compete Agreement [Member]          
Intangible Assets [Line Items]          
Finite-lived intangible assets, net   $ 301,000