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Summary Of Significant Accounting Policies (Details)
 12 Months Ended
Sep. 28, 2019
USD ($)
segment
item
Sep. 29, 2018
USD ($)
Sep. 30, 2017
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Oct. 01, 2019
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Sep. 29, 2019
USD ($)
Summary Of Significant Accounting Policies [Line Items]          
Number of locations | item 198        
Number of operating segments | segment 1        
Outstanding checks in excess of bank balances $ 0 $ 0      
Short-term investments and certificates of deposit 0        
Demand deposits $ 37,600,000        
Number of banks | item 3        
FDIC insurance limit per bank $ 250,000        
Total depreciation expense 112,500,000 113,100,000 $ 110,900,000    
Liability coverage per occurrence for workers compensation 1,000,000        
Liability coverage for general liability 500,000        
Liability coverage per covered person for medical care benefits 450,000        
Company's self insurance reserves 31,000,000 34,700,000      
Expected self-insurance recoveries from excess cost insurance 3,600,000 4,600,000      
Certificate of deposit 2,600,000        
Undrawn letters of credit 9,000,000        
Advertising and promotion expenses, net of vendor allowances 10,000,000 12,600,000 12,500,000    
Depreciation expense included in costs of goods sold totaled $ 14,500,000 14,400,000 15,400,000    
Fluid dairy revenues recognition 54.00%        
Vendor allowances applied as a reduction of merchandise costs $ 111,700,000 116,500,000 116,600,000    
Vendor advertising allowances recorded as a reduction of advertising expense $ 13,800,000 $ 14,100,000 $ 13,800,000    
Subsequent Event [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Liability coverage for general liability       $ 1,000,000  
Undrawn Letters Of Credit [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Expiry date of undrawn letters of credit, End Oct. 31, 2019        
Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Right of use assets         $ 45,000,000
Lease obligations         $ 55,000,000
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        
North Carolina [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Number of locations | item 73        
Georgia [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Number of locations | item 66        
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