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Summary Of Significant Accounting Policies (Details)
 12 Months Ended
Sep. 24, 2016
USD ($)
segment
item
Sep. 26, 2015
USD ($)
Sep. 27, 2014
USD ($)
Summary Of Significant Accounting Policies [Line Items]      
Number of locations | item 201    
Number of operating segments | segment 1    
Deferred tax assets $ 7,300,000 $ 7,300,000  
Outstanding checks in excess of bank balances 5,000,000 14,400,000  
Demand deposits $ 1,500,000    
Number of banks | item 3    
FDIC insurance limit per bank $ 250,000    
Total depreciation expense 106,600,000 102,900,000 $ 97,700,000
Debt issuance costs 8,105,090 9,289,265  
Accumulated amortization 5,100,000 3,700,000  
Costs to be amortized over the life of the underlying debt instrument or lease, per year. 1,300,000    
Liability coverage per occurrence for workers compensation 750,000    
Liability coverage for general liability 500,000    
Liability coverage per covered person for medical care benefits 325,000    
Company's self insurance reserves 35,900,000 36,300,000  
Expected self-insurance recoveries from excess cost insurance 4,800,000 4,900,000  
Undrawn letters of credit $ 8,900,000    
Expiry date of undrawn letters of credit, Start Sep. 01, 2017    
Expiry date of undrawn letters of credit, End Oct. 31, 2017    
Advertising and promotion expenses, net of vendor allowances $ 13,300,000 12,100,000 12,300,000
Depreciation expense included in costs of goods sold totaled $ 16,000,000 15,700,000 16,700,000
Fluid dairy revenues recognition 53.00%    
Vendor allowances applied as a reduction of merchandise costs $ 115,800,000 115,800,000 126,700,000
Vendor advertising allowances recorded as a reduction of advertising expense $ 13,500,000 $ 14,300,000 $ 14,800,000
Buildings [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful life of property, plant and equipment 30 years    
Minimum [Member] | Store, Office and Warehouse Equipment [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful life of property, plant and equipment 3 years    
Minimum [Member] | Transportation Equipment [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful life of property, plant and equipment 3 years    
Minimum [Member] | Leasehold Improvements [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful life of property, plant and equipment 3 years    
Maximum [Member] | Store, Office and Warehouse Equipment [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful life of property, plant and equipment 10 years    
Maximum [Member] | Transportation Equipment [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful life of property, plant and equipment 5 years    
Maximum [Member] | Leasehold Improvements [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Useful life of property, plant and equipment 30 years    
Georgia [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Number of locations | item 71    
North Carolina [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Number of locations | item 70    
South Carolina [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Number of locations | item 36    
Tennessee [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Number of locations | item 21    
Virginia [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Number of locations | item 2    
Alabama [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Number of locations | item 1