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Other Assets - Narrative (Detail) (USD $)
 3 Months Ended 3 Months Ended 1 Months Ended
Aug. 03, 2014
Contract
May 16, 2014
Apr. 27, 2014
Contract
Jul. 28, 2013
Contract
Aug. 03, 2014
After Settlement of Life Insurance Agreement [Member]
Contract
Aug. 03, 2014
Other assets [Member]
Apr. 27, 2014
Other assets [Member]
Jul. 28, 2013
Other assets [Member]
Aug. 03, 2014
Other assets [Member]
Non-compete Agreement [Member]
Jul. 28, 2013
Other assets [Member]
Non-compete Agreement [Member]
Apr. 27, 2014
Other assets [Member]
Non-compete Agreement [Member]
Aug. 03, 2014
Other assets [Member]
Asset Purchase Agreement Dated August 11, 2008 [Member]
Aug. 03, 2014
Other assets [Member]
Asset Purchase Agreement Dated May 8, 2013 [Member]
Aug. 03, 2014
Other assets [Member]
Customer Relationships [Member]
Jul. 28, 2013
Other assets [Member]
Customer Relationships [Member]
Apr. 27, 2014
Other assets [Member]
Customer Relationships [Member]
Sep. 12, 2014
Other Current Assets [Member]
Subsequent Event [Member]
Aug. 03, 2014
Other Noncurrent Assets [Member]
Apr. 27, 2014
Other Noncurrent Assets [Member]
Jul. 28, 2013
Other Noncurrent Assets [Member]
Aug. 03, 2014
Other Noncurrent Assets [Member]
After Settlement of Life Insurance Agreement [Member]
Other Assets [Line Items]                                          
Useful life                 15 years         17 years              
Gross carrying amount of non-compete agreement           $ 2,000,000 $ 2,000,000 $ 2,000,000                          
Accumulated amortization                 1,000,000 958,000.0 1,000,000     64,000 13,000 51,000          
Non-compete agreement carrying amount                       227,000 808,000         1,035,000 1,041,000 1,061,000  
Amortization expense                 19,000 19,000       13,000 13,000            
Remaining amortization expense for the next fiscal year                 56,000         38,000              
Remaining amortization expense for the second fiscal year                 75,000         51,000              
Remaining amortization expense for the third fiscal year                 75,000         51,000              
Remaining amortization expense for the fourth fiscal year                 75,000         51,000              
Remaining amortization expense for the fifth fiscal year                 75,000         51,000              
Remaining amortization expense for the fiscal year thereafter                 679,000         562,000              
Weighted average remaining amortization period                 13 years 9 months 18 days         15 years 9 months 18 days              
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        
Number of life insurance contracts owned 2   2 2 1                                
Life insurance contracts, death benefits to insured 3,900,000   3,900,000 3,900,000 1,400,000                                
Life insurance contracts, cash surrender value $ 640,000   $ 644,000 $ 622,000                           $ 320,000 $ 644,000 $ 622,000 $ 320,000