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Intangible Assets - Narrative (Detail) - USD ($)
 6 Months Ended
Oct. 31, 2021
May 02, 2021
Nov. 01, 2020
Intangible Assets [Line Items]      
Tradename $ 540,000 $ 540,000 $ 540,000
Asset impairment charges 0    
Gross carrying amount of customer relationships 3,100,000 3,100,000 3,100,000
Gross carrying amount of non-compete agreement 2,000,000.0 2,000,000.0 2,000,000.0
Customer Relationships [Member]      
Intangible Assets [Line Items]      
Accumulated amortization 1,300,000 1,200,000 1,000,000.0
Remaining amortization expense for the fiscal year 151,000    
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 $ 432,000    
Weighted average remaining amortization period 6 years 2 months 12 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 $ 1,500,000 $ 1,500,000
Remaining amortization expense for the fiscal year 37,000    
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 $ 148,000    
Weighted average remaining amortization period 6 years 6 months