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Intangible Assets - Narrative (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Oct. 29, 2023
Oct. 30, 2022
Oct. 29, 2023
Oct. 30, 2022
Apr. 30, 2023
May 01, 2022
Intangible Assets [Line Items]            
Asset impairment charges     $ 0      
Gross carrying amount of customer relationships $ 3,100,000 $ 3,100,000 3,100,000 $ 3,100,000 $ 3,100,000  
Incurred operating losses (2,239,000) (11,931,000) (5,321,000) (16,669,000)    
Gross carrying amount of non-compete agreement 2,000,000 2,000,000 2,000,000 2,000,000 2,000,000  
Property, plant and equipment, net 34,664,000 38,832,000 34,664,000 38,832,000 36,111,000 [1]  
Right of use assets 6,874,000 11,609,000 6,874,000 11,609,000 8,191,000 [1]  
Customer Relationships [Member]            
Intangible Assets [Line Items]            
Finite-lived intangible assets, net 1,185,000 1,486,000 1,185,000 1,486,000 1,335,000 $ 1,636,000
Accumulated amortization 1,900,000 1,600,000 1,900,000 1,600,000 1,800,000  
Remaining amortization expense for the fiscal year 151,000   151,000      
Remaining amortization expense for the first fiscal year 301,000   301,000      
Remaining amortization expense for the second fiscal year 301,000   301,000      
Remaining amortization expense for the third fiscal year 278,000   278,000      
Remaining amortization expense for the fourth fiscal year 52,000   52,000      
Remaining amortization expense for the fiscal year thereafter $ 102,000   $ 102,000      
Weighted average remaining amortization period 4 years 3 months 18 days   4 years 3 months 18 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 $ 339,000 414,000 $ 339,000 414,000 377,000 $ 452,000
Accumulated amortization 1,700,000 1,600,000 1,700,000 $ 1,600,000 $ 1,600,000  
Remaining amortization expense for the fiscal year 38,000   38,000      
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 76,000   76,000      
Remaining amortization expense for the fourth fiscal year $ 73,000   $ 73,000      
Weighted average remaining amortization period 4 years 6 months   4 years 6 months      
Mattress Asset Group [Member]            
Intangible Assets [Line Items]            
Carrying amount of asset group, net $ 35,500,000   $ 35,500,000      
Impairment charge     0      
Mattress Asset Group [Member] | Mattress Fabrics [Member]            
Intangible Assets [Line Items]            
Incurred operating losses   $ 18,100,000        
Mattress Asset Group [Member] | Customer Relationships [Member] | Mattress Fabrics [Member]            
Intangible Assets [Line Items]            
Finite-lived intangible assets, net 332,000   332,000      
Mattress Asset Group [Member] | Non-Compete Agreement [Member] | Mattress Fabrics [Member]            
Intangible Assets [Line Items]            
Finite-lived intangible assets, net 339,000   339,000      
Mattress Asset Group [Member] | Property, Plant and Equipment [Member]            
Intangible Assets [Line Items]            
Property, plant and equipment, net 32,800,000   32,800,000      
Mattress Asset Group [Member] | Right Of Use Assets [Member]            
Intangible Assets [Line Items]            
Right of use assets $ 2,000,000   $ 2,000,000      
[1] Derived from audited consolidated financial statements.