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Intangible Assets - Narrative (Detail) - USD ($)
3 Months Ended 9 Months Ended
Feb. 02, 2020
Jan. 27, 2019
Feb. 02, 2020
Jan. 27, 2019
Apr. 28, 2019
Intangible Assets [Line Items]          
Impairment charge $ 2,400,000 $ 0 $ 2,428,000 $ 0  
Gross carrying amount of customer relationships 3,100,000 3,100,000 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 2,000,000 2,000,000
Customer Relationships [Member]          
Intangible Assets [Line Items]          
Accumulated amortization 802,000 502,000 802,000 502,000 577,000
Remaining amortization expense for the fiscal year 76,000   76,000    
Remaining amortization expense for the second fiscal year 301,000   301,000    
Remaining amortization expense for the third fiscal year 301,000   301,000    
Remaining amortization expense for the fourth fiscal year 301,000   301,000    
Remaining amortization expense for the fifth fiscal year 301,000   301,000    
Remaining amortization expense for the fiscal year thereafter 1,033,000   $ 1,033,000    
Weighted average remaining amortization period     7 years 10 months 24 days    
Customer Relationships [Member] | Maximum [Member]          
Intangible Assets [Line Items]          
Useful life     17 years    
Customer Relationships [Member] | Minimum [Member]          
Intangible Assets [Line Items]          
Useful life     9 years    
Non-Compete Agreement [Member]          
Intangible Assets [Line Items]          
Useful life     15 years    
Accumulated amortization 1,400,000 $ 1,300,000 $ 1,400,000 $ 1,300,000 $ 1,400,000
Remaining amortization expense for the fiscal year 19,000   19,000    
Remaining amortization expense for the second fiscal year 75,000   75,000    
Remaining amortization expense for the third fiscal year 75,000   75,000    
Remaining amortization expense for the fourth fiscal year 75,000   75,000    
Remaining amortization expense for the fifth fiscal year 75,000   75,000    
Remaining amortization expense for the fiscal year thereafter $ 302,000   $ 302,000    
Weighted average remaining amortization period     8 years 3 months 18 days