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Other Assets - Narrative (Detail) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Nov. 02, 2014
Contract
Nov. 02, 2014
Contract
May 16, 2014
Apr. 27, 2014
Contract
Oct. 27, 2013
Contract
Nov. 02, 2014
Other assets [Member]
Apr. 27, 2014
Other assets [Member]
Oct. 27, 2013
Other assets [Member]
Nov. 02, 2014
Other assets [Member]
Asset Purchase Agreement Dated August 11, 2008 [Member]
Nov. 02, 2014
Other assets [Member]
Asset Purchase Agreement Dated May 8, 2013 [Member]
Nov. 02, 2014
Other assets [Member]
Customer Relationships [Member]
Oct. 27, 2013
Other assets [Member]
Customer Relationships [Member]
Apr. 27, 2014
Other assets [Member]
Customer Relationships [Member]
Nov. 02, 2014
Other assets [Member]
Non-compete Agreement [Member]
Oct. 27, 2013
Other assets [Member]
Non-compete Agreement [Member]
Apr. 27, 2014
Other assets [Member]
Non-compete Agreement [Member]
Other Assets [Line Items]                                
Useful life                     17 years     15 years    
Gross carrying amount of non-compete agreement           $ 2,000,000 $ 2,000,000 $ 2,000,000                
Accumulated amortization                     77,000 26,000 51,000 1,000,000 1,000,000 1,000,000
Non-compete agreement carrying amount 1,017,000 1,017,000   1,041,000 1,054,000       223,000 794,000            
Amortization expense                     26,000 26,000   38,000 38,000  
Remaining amortization expense for the fiscal year                     25,000     38,000    
Remaining amortization expense for the second fiscal year                     51,000     75,000    
Remaining amortization expense for the third fiscal year                     51,000     75,000    
Remaining amortization expense for the fourth fiscal year                     51,000     75,000    
Remaining amortization expense for the fifth fiscal year                     51,000     75,000    
Remaining amortization expense for the fiscal year thereafter                     562,000     679,000    
Weighted average remaining amortization period                     15 years 6 months     13 years 6 months    
Gross carrying amount of customer relationships           868,000 868,000 868,000                
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 1 1   2 2                      
Life insurance contracts, death benefits to insured 1,400,000 1,400,000   3,900,000 3,900,000                      
Life insurance contracts, cash surrender value $ 320,000 $ 320,000   $ 644,000 $ 649,000