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Summary Of Significant Accounting Policies (Details)
 12 Months Ended
Sep. 30, 2017
USD ($)
segment
item
Sep. 24, 2016
USD ($)
Sep. 26, 2015
USD ($)
Summary Of Significant Accounting Policies [Line Items]      
Number of locations | item 199    
Number of operating segments | segment 1    
Outstanding checks in excess of bank balances $ 0 $ 5,000,000  
Short-term investments and certificates of deposit 0    
Demand deposits $ 19,200,000    
Number of banks | item 4    
FDIC insurance limit per bank $ 250,000    
Total depreciation expense 110,900,000 106,600,000 $ 102,900,000
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 450,000    
Company's self insurance reserves 35,500,000 35,900,000  
Expected self-insurance recoveries from excess cost insurance 4,800,000 4,800,000  
Undrawn letters of credit $ 8,900,000    
Expiry date of undrawn letters of credit, Start Oct. 01, 2017    
Expiry date of undrawn letters of credit, End Sep. 30, 2018    
Advertising and promotion expenses, net of vendor allowances $ 12,500,000 13,300,000 12,100,000
Depreciation expense included in costs of goods sold totaled $ 15,400,000 16,000,000 15,700,000
Fluid dairy revenues recognition 54.00%    
Vendor allowances applied as a reduction of merchandise costs $ 116,600,000 115,800,000 115,800,000
Vendor advertising allowances recorded as a reduction of advertising expense $ 13,800,000 $ 13,500,000 $ 14,300,000
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 70    
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 1    
Alabama [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Number of locations | item 1