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Intangible Assets - Narrative (Detail) - USD ($)
 3 Months Ended
Aug. 02, 2020
May 03, 2020
Aug. 04, 2019
Intangible Assets [Line Items]      
Tradenames $ 540,000 $ 540,000 $ 7,232,000
Gross carrying amount of customer relationships 3,100,000 3,100,000 3,100,000
Gross carrying amount of non-compete agreement 2,000,000 2,000,000 2,000,000
Customer Relationships [Member]      
Intangible Assets [Line Items]      
Accumulated amortization 953,000 877,000 652,000
Remaining amortization expense for the fiscal year 226,000    
Remaining amortization expense for the first fiscal year 301,000    
Remaining amortization expense for the second fiscal year 301,000    
Remaining amortization expense for the third fiscal year 301,000    
Remaining amortization expense for the fourth fiscal year 301,000    
Remaining amortization expense for the fiscal year thereafter $ 732,000    
Weighted average remaining amortization period 7 years 4 months 24 days    
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 $ 1,500,000 1,400,000 $ 1,400,000
Remaining amortization expense for the fiscal year 56,000    
Remaining amortization expense for the first 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 76,000    
Remaining amortization expense for the fiscal year thereafter $ 224,000    
Weighted average remaining amortization period 7 years 9 months 18 days    
Read Window Products, LLC [Member]      
Intangible Assets [Line Items]      
Impairment charge   $ 143,000