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Summary of Significant Accounting Policies (Details)
 12 Months Ended
Sep. 28, 2024
USD ($)
item
segment
Sep. 30, 2023
USD ($)
Sep. 24, 2022
USD ($)
Summary of Significant Accounting Policies [Line Items]      
Number of locations | item 198    
Number of operating segments | segment 1    
Fiscal Period Duration 364 days 371 days 364 days
Outstanding checks in excess of bank balances $ 0 $ 0  
Demand deposits $ 346,300,000    
Number of banks | item 5    
FDIC insurance limit per bank $ 250,000    
Inventory impairment loss 30,400,000    
Total depreciation expense 121,600,000 116,000,000.0 $ 117,800,000
Property and equipment impairment loss 4,500,000    
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 35,900,000 32,900,000  
Expected self-insurance recoveries from excess cost insurance 4,100,000 4,300,000  
Advertising and promotion expenses, net of vendor allowances 14,500,000 14,600,000 20,800,000
Depreciation expense included in costs of goods sold totaled $ 16,400,000 15,200,000 15,000,000.0
Fluid dairy revenues recognition 40.50%    
Vendor allowances applied as a reduction of merchandise costs $ 146,900,000 128,900,000 110,600,000
Vendor advertising allowances recorded as a reduction of advertising expense 8,900,000 8,500,000 $ 7,100,000
401(k) [Member]      
Summary of Significant Accounting Policies [Line Items]      
Liability to plan participants $ 28,900,000 $ 21,800,000  
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