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Other Assets - Narrative (Detail)
 6 Months Ended
Oct. 29, 2017
USD ($)
Contract
Oct. 30, 2016
USD ($)
Contract
Apr. 30, 2017
USD ($)
Contract
Other Assets [Line Items]      
Gross carrying amount of non-compete agreement $ 2,000,000 $ 2,000,000 $ 2,000,000
Gross carrying amount of customer relationships $ 868,000 $ 868,000 $ 868,000
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 $ 376,000 358,000 376,000
Non-compete Agreement [Member]      
Other Assets [Line Items]      
Useful life 15 years    
Accumulated amortization $ 1,200,000 1,200,000 1,200,000
Amortization expense 38,000 38,000  
Remaining amortization expense for the fiscal year 37,000    
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 10 years 6 months    
Customer Relationships [Member]      
Other Assets [Line Items]      
Useful life 17 years    
Accumulated amortization $ 230,000 179,000 $ 204,000
Amortization expense 26,000 $ 26,000  
Remaining amortization expense for the fiscal year 25,000    
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 12 years 6 months