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Summary of Significant Accounting Policies (Details)
 12 Months Ended
Sep. 30, 2023
USD ($)
item
segment
Sep. 24, 2022
USD ($)
Sep. 25, 2021
USD ($)
Summary of Significant Accounting Policies [Line Items]      
Number of locations | item 198    
Number of operating segments | segment 1    
Right of use assets $ 39,602,202 $ 38,594,968  
Lease obligations $ 41,611,640    
Fiscal Period Duration 371 days 364 days 364 days
Outstanding checks in excess of bank balances $ 0 $ 0  
Demand deposits $ 323,500,000    
Number of banks | item 5    
FDIC insurance limit per bank $ 250,000    
Total depreciation expense 116,000,000.0 117,800,000 $ 117,100,000
Liability coverage per occurrence for workers compensation 1,000,000    
Liability coverage per covered person for medical care benefits 500,000    
Company's self insurance reserves 32,900,000 31,000,000.0  
Expected self-insurance recoveries from excess cost insurance 4,300,000 4,000,000.0  
Advertising and promotion expenses, net of vendor allowances 14,600,000 20,800,000 18,600,000
Depreciation expense included in costs of goods sold totaled $ 15,200,000 15,000,000.0 16,400,000
Fluid dairy revenues recognition 43.00%    
Vendor allowances applied as a reduction of merchandise costs $ 128,900,000 110,600,000 116,300,000
Vendor advertising allowances recorded as a reduction of advertising expense 8,500,000 7,100,000 $ 8,100,000
401(k) [Member]      
Summary of Significant Accounting Policies [Line Items]      
Liability to plan participants $ 21,800,000 $ 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