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Other Assets - Narrative (Detail)
 3 Months Ended 9 Months Ended
Nov. 02, 2014
USD ($)
Jan. 31, 2016
USD ($)
Contract
Feb. 01, 2015
USD ($)
Contract
May. 03, 2015
USD ($)
Contract
May. 16, 2014
USD ($)
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   $ 357,000 338,000 339,000  
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    
Non-compete Agreement [Member]          
Other Assets [Line Items]          
Useful life   15 years      
Accumulated amortization   $ 1,100,000 1,000,000 1,100,000  
Amortization expense   56,000 56,000    
Remaining amortization expense for the fiscal year   18,000      
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   12 years 3 months 18 days      
Customer Relationships [Member]          
Other Assets [Line Items]          
Useful life   17 years      
Accumulated amortization   $ 140,000 89,000 $ 102,000  
Amortization expense   38,000 $ 38,000    
Remaining amortization expense for the fiscal year   13,000      
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   14 years 3 months 18 days