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Other Assets - Narrative (Detail)
 3 Months Ended 12 Months Ended
Nov. 02, 2014
USD ($)
May 01, 2016
USD ($)
Contract
May 03, 2015
USD ($)
Contract
Apr. 27, 2014
USD ($)
May 16, 2014
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    
Death benefits to beneficiary of insured on terminated life insurance agreement         $ 2,500,000
Collection of cash surrender value from termination of split dollar life insurance agreement $ 320,000   $ 320,000    
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   $ 357,000 339,000    
Non-compete Agreement [Member]          
Other Assets [Line Items]          
Useful life   15 years      
Accumulated amortization   $ 1,100,000 1,100,000    
Amortization expense   75,000 75,000 $ 75,000  
Remaining amortization expense for the next 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   $ 528,000      
Weighted average remaining amortization period   12 years      
Customer Relationships [Member]          
Other Assets [Line Items]          
Useful life   17 years      
Accumulated amortization   $ 153,000 102,000    
Amortization expense   51,000 $ 51,000 $ 51,000  
Remaining amortization expense for the next 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   $ 460,000      
Weighted average remaining amortization period   14 years