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Other Noncurrent Assets- Narrative (Detail)
 9 Months Ended
Jan. 28, 2018
USD ($)
Contract
Jan. 29, 2017
USD ($)
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 $ 394,000 376,000 376,000
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 56,000 56,000  
Remaining amortization expense for the fiscal year 19,000    
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 3 months 18 days    
Customer Relationships [Member]      
Other Assets [Line Items]      
Useful life 17 years    
Accumulated amortization $ 243,000 191,000 $ 204,000
Amortization expense 38,000 $ 38,000  
Remaining amortization expense for the fiscal year 12,000    
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 3 months 18 days