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Summary Of Significant Accounting Policies (Details)
 12 Months Ended 36 Months Ended
Sep. 24, 2022
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Sep. 25, 2021
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Sep. 26, 2020
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Sep. 24, 2022
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Summary Of Significant Accounting Policies [Line Items]        
Number of locations | item 198      
Number of operating segments | segment 1      
Right of use assets $ 38,594,968 $ 40,145,098   $ 38,594,968
Lease obligations 40,592,584     $ 40,592,584
Fiscal Period Duration       364 days
Outstanding checks in excess of bank balances 0 0   $ 0
Short-term investments and certificates of deposit   5,000,000    
Demand deposits $ 262,300,000     $ 262,300,000
Number of banks | item 5     5
FDIC insurance limit per bank $ 250,000     $ 250,000
Total depreciation expense 117,800,000 117,100,000 $ 116,300,000  
Liability coverage per occurrence for workers compensation 1,000,000     1,000,000
Liability coverage per covered person for medical care benefits 475,000     475,000
Company's self insurance reserves 31,000,000.0 32,100,000   $ 31,000,000.0
Expected self-insurance recoveries from excess cost insurance 4,000,000.0 4,200,000    
Advertising and promotion expenses, net of vendor allowances 20,800,000 18,600,000 15,800,000  
Depreciation expense included in costs of goods sold totaled $ 15,000,000.0 16,400,000 15,600,000  
Fluid dairy revenues recognition 49.00%     49.00%
Vendor allowances applied as a reduction of merchandise costs $ 110,600,000 116,300,000 107,500,000  
Vendor advertising allowances recorded as a reduction of advertising expense 7,100,000 8,100,000 $ 8,000,000.0  
401(k) [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Liability to plan participants $ 18,400,000 $ 21,000,000.0   $ 18,400,000
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 75      
Georgia [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Number of locations | item 65      
South Carolina [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Number of locations | item 35      
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