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Other Noncurrent Assets - Narrative (Detail)
 3 Months Ended
Jul. 29, 2018
USD ($)
Contract
Apr. 29, 2018
USD ($)
Contract
Apr. 01, 2018
USD ($)
Jul. 30, 2017
USD ($)
Contract
Apr. 30, 2017
USD ($)
Other Assets [Line Items]          
Customer relationships, net $ 2,764,000 $ 2,839,000   $ 651,000 $ 664,000
Gross carrying amount of customer relationships 3,100,000 3,100,000   868,000  
Gross carrying amount of non-compete agreement $ 2,000,000 $ 2,000,000   $ 2,000,000  
Number of life insurance contracts owned | Contract 1 1   1  
Life insurance contracts, death benefits to insured $ 1,400,000 $ 1,400,000   $ 1,400,000  
Life insurance contracts, cash surrender value 393,000 393,000   376,000  
Prior Acquisition [Member]          
Other Assets [Line Items]          
Customer relationships, net 600,000        
Non-compete Agreement [Member]          
Other Assets [Line Items]          
Accumulated amortization 1,300,000 1,300,000   1,200,000  
Remaining amortization expense for the fiscal year 56,000        
Remaining amortization expense for the second fiscal year 75,000        
Remaining amortization expense for the third fiscal year 75,000        
Remaining amortization expense for the fourth fiscal year 75,000        
Remaining amortization expense for the fifth fiscal year 75,000        
Remaining amortization expense for the fiscal year thereafter $ 378,000        
Weighted average remaining amortization period 9 years 9 months 18 days        
Non-compete Agreement [Member] | Prior Acquisition [Member]          
Other Assets [Line Items]          
Useful life 15 years        
Customer Relationships [Member]          
Other Assets [Line Items]          
Accumulated amortization $ 351,000 $ 276,000   $ 217,000  
Remaining amortization expense for the fiscal year 226,000        
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 fifth fiscal year 301,000        
Remaining amortization expense for the fiscal year thereafter $ 1,334,000        
Weighted average remaining amortization period 9 years 4 months 24 days        
Customer Relationships [Member] | Read Window Products, LLC [Member]          
Other Assets [Line Items]          
Fair market value of customer relationship     $ 2,247,000    
Useful life 9 years        
Customer Relationships [Member] | Prior Acquisition [Member]          
Other Assets [Line Items]          
Useful life 17 years