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Intangible Assets - Narrative (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Jan. 28, 2024
Jan. 29, 2023
Oct. 30, 2022
Jan. 28, 2024
Jan. 29, 2023
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 (1,740,000) (7,783,000)   (7,061,000) (24,451,000)    
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 34,021,000 37,192,000   34,021,000 37,192,000 36,111,000 [1]  
Right of use assets 6,952,000 8,913,000   6,952,000 8,913,000 8,191,000 [1]  
Customer Relationships [Member]              
Intangible Assets [Line Items]              
Finite-lived intangible assets, net 1,110,000 1,411,000   1,110,000 1,411,000 1,335,000 $ 1,636,000
Accumulated amortization 2,000,000 1,700,000   2,000,000 1,700,000 1,800,000  
Remaining amortization expense for the fiscal year 76,000     76,000      
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 1 month 6 days     4 years 1 month 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 $ 320,000 395,000   $ 320,000 395,000 377,000 $ 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 19,000     19,000      
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 3 months 18 days     4 years 3 months 18 days      
Mattress Asset Group [Member]              
Intangible Assets [Line Items]              
Carrying amount of asset group, net $ 34,700,000     $ 34,700,000      
Impairment charge       0      
Mattress Asset Group [Member] | Mattress Fabrics [Member]              
Intangible Assets [Line Items]              
Incurred operating losses     $ 19,700,000        
Mattress Asset Group [Member] | Customer Relationships [Member] | Mattress Fabrics [Member]              
Intangible Assets [Line Items]              
Finite-lived intangible assets, net 319,000     319,000      
Mattress Asset Group [Member] | Non-Compete Agreement [Member] | Mattress Fabrics [Member]              
Intangible Assets [Line Items]              
Finite-lived intangible assets, net 320,000     320,000      
Mattress Asset Group [Member] | Property, Plant and Equipment [Member]              
Intangible Assets [Line Items]              
Property, plant and equipment, net 32,300,000     32,300,000      
Mattress Asset Group [Member] | Right Of Use Assets [Member]              
Intangible Assets [Line Items]              
Right of use assets $ 1,800,000     $ 1,800,000      
[1] Derived from audited consolidated financial statements.