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Summary Of Significant Accounting Policies (Details)
 12 Months Ended
Sep. 25, 2021
USD ($)
item
segment
Sep. 26, 2020
USD ($)
Sep. 28, 2019
USD ($)
Summary Of Significant Accounting Policies [Line Items]      
Number of locations | item 198    
Number of operating segments | segment 1    
Right of use assets $ 40,145,098 $ 46,590,718  
Lease obligations 42,523,933    
Outstanding checks in excess of bank balances 0 0  
Short-term investments and certificates of deposit 5,000,000    
Demand deposits $ 63,200,000    
Number of banks | item 5    
FDIC insurance limit per bank $ 250,000    
Total depreciation expense 117,100,000 116,300,000 $ 112,500,000
Liability coverage per occurrence for workers compensation 1,000,000    
Liability coverage per covered person for medical care benefits 450,000    
Company's self insurance reserves 32,100,000 34,100,000  
Expected self-insurance recoveries from excess cost insurance 4,200,000 4,700,000  
Advertising and promotion expenses, net of vendor allowances 18,600,000 15,800,000 10,000,000.0
Depreciation expense included in costs of goods sold totaled $ 16,400,000 15,600,000 14,500,000
Fluid dairy revenues recognition 56.00%    
Vendor allowances applied as a reduction of merchandise costs $ 116,300,000 107,500,000 111,700,000
Vendor advertising allowances recorded as a reduction of advertising expense 8,100,000 8,000,000.0 $ 13,800,000
401(k) [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Liability to plan participants $ 21,000,000.0 $ 16,700,000  
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