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Intangible Assets - Narrative (Detail) - USD ($)
 3 Months Ended 9 Months Ended 30 Months Ended
Jan. 26, 2025
Jan. 28, 2024
Jan. 26, 2025
Jan. 28, 2024
Jan. 26, 2025
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 $ 3,100,000 $ 3,100,000  
Incurred operating losses (3,887,000) (1,740,000) (16,138,000) (7,061,000)      
Gross carrying amount of non-compete agreement 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000  
Property, plant and equipment, net 25,939,000 34,021,000 25,939,000 34,021,000 25,939,000 33,182,000 [1]  
Right of use assets 6,103,000 6,952,000 6,103,000 6,952,000 6,103,000 6,203,000 [1]  
Customer Relationships [Member]              
Intangible Assets [Line Items]              
Finite-lived intangible assets, net 809,000 1,110,000 809,000 1,110,000 809,000 1,035,000 $ 1,335,000
Accumulated amortization 2,300,000 2,000,000 2,300,000 2,000,000 2,300,000 2,100,000  
Remaining amortization expense for the fiscal year 75,000   75,000   75,000    
Remaining amortization expense for the first fiscal year 301,000   301,000   301,000    
Remaining amortization expense for the second fiscal year 280,000   280,000   280,000    
Remaining amortization expense for the third fiscal year 51,000   51,000   51,000    
Remaining amortization expense for the fourth fiscal year 51,000   51,000   51,000    
Remaining amortization expense for the fiscal year thereafter $ 51,000   $ 51,000   $ 51,000    
Weighted average remaining amortization period 3 years 2 months 12 days   3 years 2 months 12 days   3 years 2 months 12 days    
Customer Relationships [Member] | Minimum [Member]              
Intangible Assets [Line Items]              
Useful life 9 years   9 years   9 years    
Customer Relationships [Member] | Maximum [Member]              
Intangible Assets [Line Items]              
Useful life 17 years   17 years   17 years    
Non-Compete Agreement [Member]              
Intangible Assets [Line Items]              
Useful life 15 years   15 years   15 years    
Finite-lived intangible assets, net $ 245,000 320,000 $ 245,000 320,000 $ 245,000 301,000 $ 377,000
Accumulated amortization 1,800,000 $ 1,700,000 1,800,000 $ 1,700,000 1,800,000 $ 1,700,000  
Remaining amortization expense for the fiscal year 19,000   19,000   19,000    
Remaining amortization expense for the first fiscal year 76,000   76,000   76,000    
Remaining amortization expense for the second fiscal year 76,000   76,000   76,000    
Remaining amortization expense for the third fiscal year $ 74,000   $ 74,000   $ 74,000    
Weighted average remaining amortization period 3 years 3 months 18 days   3 years 3 months 18 days   3 years 3 months 18 days    
Mattress Asset Group [Member]              
Intangible Assets [Line Items]              
Carrying amount of asset group, net $ 24,900,000   $ 24,900,000   $ 24,900,000    
Impairment charge     0        
Mattress Asset Group [Member] | Mattress Fabrics [Member]              
Intangible Assets [Line Items]              
Incurred operating losses         35,300,000    
Mattress Asset Group [Member] | Customer Relationships [Member] | Mattress Fabrics [Member]              
Intangible Assets [Line Items]              
Finite-lived intangible assets, net 268,000   268,000   268,000    
Mattress Asset Group [Member] | Non-Compete Agreement [Member] | Mattress Fabrics [Member]              
Intangible Assets [Line Items]              
Finite-lived intangible assets, net 245,000   245,000   245,000    
Mattress Asset Group [Member] | Property, Plant and Equipment [Member]              
Intangible Assets [Line Items]              
Property, plant and equipment, net 24,200,000   24,200,000   24,200,000    
Mattress Asset Group [Member] | Right Of Use Assets [Member]              
Intangible Assets [Line Items]              
Right of use assets $ 200,000   $ 200,000   $ 200,000    
[1] Derived from audited consolidated financial statements.