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Intangible Assets - Narrative (Detail) - USD ($)
 3 Months Ended 24 Months Ended
Jul. 28, 2024
Jul. 30, 2023
Jul. 28, 2024
Apr. 28, 2024
Apr. 30, 2023
Intangible Assets [Line Items]          
Impairment charges of tradename $ 0        
Gross carrying amount of customer relationships 3,100,000 $ 3,100,000 $ 3,100,000 $ 3,100,000  
Incurred operating losses (6,851,000) (3,082,000)      
Gross carrying amount of non-compete agreement 2,000,000 2,000,000 2,000,000 2,000,000  
Property, plant and equipment, net 30,476,000 34,929,000 30,476,000 33,182,000 [1]  
Right of use assets 4,483,000 7,466,000 4,483,000 6,203,000 [1]  
Customer Relationships [Member]          
Intangible Assets [Line Items]          
Finite-lived intangible assets, net 960,000 1,260,000 960,000 1,035,000 $ 1,335,000
Accumulated amortization 2,100,000 1,900,000 2,100,000 2,100,000  
Remaining amortization expense for the fiscal year 226,000   226,000    
Remaining amortization expense for the first 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 fiscal year thereafter $ 51,000   $ 51,000    
Weighted average remaining amortization period 3 years 7 months 6 days   3 years 7 months 6 days    
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 $ 282,000 358,000 $ 282,000 301,000 $ 377,000
Accumulated amortization 1,800,000 $ 1,700,000 1,800,000 $ 1,700,000  
Remaining amortization expense for the fiscal year 57,000   57,000    
Remaining amortization expense for the first 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 $ 73,000   $ 73,000    
Weighted average remaining amortization period 3 years 9 months 18 days   3 years 9 months 18 days    
Mattress Asset Group [Member]          
Intangible Assets [Line Items]          
Carrying amount of asset group, net $ 30,000,000   $ 30,000,000    
Impairment charge 0        
Mattress Asset Group [Member] | Mattress Fabrics [Member]          
Intangible Assets [Line Items]          
Incurred operating losses     28,800,000    
Mattress Asset Group [Member] | Customer Relationships [Member] | Mattress Fabrics [Member]          
Intangible Assets [Line Items]          
Finite-lived intangible assets, net 294,000   294,000    
Mattress Asset Group [Member] | Non-Compete Agreement [Member] | Mattress Fabrics [Member]          
Intangible Assets [Line Items]          
Finite-lived intangible assets, net 282,000   282,000    
Mattress Asset Group [Member] | Property, Plant and Equipment [Member]          
Intangible Assets [Line Items]          
Property, plant and equipment, net 28,800,000   28,800,000    
Mattress Asset Group [Member] | Right Of Use Assets [Member]          
Intangible Assets [Line Items]          
Right of use assets $ 568,000   $ 568,000    
[1] Derived from audited consolidated financial statements.