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Other Assets - Narrative (Detail)
 12 Months Ended
Apr. 30, 2017
USD ($)
Contract
May 01, 2016
USD ($)
Contract
May 03, 2015
USD ($)
Other Assets [Line Items]      
Gross carrying amount of non-compete agreement $ 2,000,000 $ 2,000,000  
Gross carrying amount of customer relationships $ 868,000 $ 868,000  
Number of life insurance contracts owned | Contract 1 1  
Life insurance contracts, death benefits to insured $ 1,400,000 $ 1,400,000  
Life insurance contracts, cash surrender value $ 376,000 357,000  
Non-compete Agreement [Member]      
Other Assets [Line Items]      
Useful life 15 years    
Accumulated amortization $ 1,200,000 1,100,000  
Amortization expense 75,000 75,000 $ 75,000
Remaining amortization expense for the fiscal year 75,000    
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 $ 453,000    
Weighted average remaining amortization period 11 years    
Customer Relationships [Member]      
Other Assets [Line Items]      
Useful life 17 years    
Accumulated amortization $ 204,000 153,000  
Amortization expense 51,000 $ 51,000 $ 51,000
Remaining amortization expense for the fiscal year 51,000    
Remaining amortization expense for the second fiscal year 51,000    
Remaining amortization expense for the third fiscal year 51,000    
Remaining amortization expense for the fourth fiscal year 51,000    
Remaining amortization expense for the fifth fiscal year 51,000    
Remaining amortization expense for the fiscal year thereafter $ 409,000    
Weighted average remaining amortization period 13 years