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Other Assets - Narrative (Detail)
 3 Months Ended 12 Months Ended
Nov. 02, 2014
USD ($)
May. 03, 2015
USD ($)
Contract
Apr. 27, 2014
USD ($)
Contract
Apr. 28, 2013
USD ($)
May. 16, 2014
USD ($)
Mar. 18, 2013
USD ($)
Dec. 11, 2012
USD ($)
Other Assets [Line Items]              
Gross carrying amount of non-compete agreement   $ 2,000,000 $ 2,000,000        
Non-compete agreement carrying amount   979,000 1,041,000        
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   $ 716,000      
Number of life insurance contracts owned | Contract   1 2        
Life insurance contracts, death benefits to insured   $ 1,400,000 $ 3,900,000        
Life insurance contracts, cash surrender value   339,000 644,000        
Compensation Agreement One [Member] | Chairman of the Board [Member]              
Other Assets [Line Items]              
Death benefits to beneficiary of insured on terminated life insurance agreement             $ 8,000,000
Collection of cash surrender value from termination of split dollar life insurance agreement       626,000      
Additional annual compensation commitment   $ 60,000          
Compensation Agreement One [Member] | Chairman of the Board [Member] | Maximum [Member]              
Other Assets [Line Items]              
Estimated term of the agreement   12 years          
Compensation Agreement Two [Member] | Chairman of the Board [Member]              
Other Assets [Line Items]              
Death benefits to beneficiary of insured on terminated life insurance agreement           $ 500,000  
Collection of cash surrender value from termination of split dollar life insurance agreement       90,000      
Non-compete Agreement [Member]              
Other Assets [Line Items]              
Useful life   15 years          
Accumulated amortization   $ 1,100,000 1,000,000        
Amortization expense   75,000 75,000 $ 198,000      
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   $ 604,000          
Weighted average remaining amortization period   13 years          
Prior non-compete agreement with Bodet and Horst [Member]              
Other Assets [Line Items]              
Useful life       6 years      
Asset Purchase Agreement Dated August 11, 2008 [Member]              
Other Assets [Line Items]              
Non-compete agreement carrying amount   $ 215,000          
Asset Purchase Agreement Dated May 8, 2013 [Member]              
Other Assets [Line Items]              
Non-compete agreement carrying amount   $ 764,000          
Customer Relationships [Member]              
Other Assets [Line Items]              
Useful life   17 years          
Accumulated amortization   $ 102,000 51,000        
Amortization expense   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   $ 511,000          
Weighted average remaining amortization period   15 years