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Summary of Significant Accounting Policies (Details)
 12 Months Ended
Sep. 27, 2025
USD ($)
item
segment
Sep. 28, 2024
USD ($)
Sep. 30, 2023
USD ($)
Summary of Significant Accounting Policies [Line Items]      
Number of locations | item 194    
Number of stores closed | item 3    
Number of operating segments | segment 1    
Fiscal Period Duration 364 days 364 days 371 days
Outstanding checks in excess of bank balances $ 0 $ 0  
Demand deposits $ 359,700,000    
Number of banks | item 5    
FDIC insurance limit per bank $ 250,000    
Inventory impairment loss   30,400,000  
Total depreciation expense 122,900,000 121,600,000 $ 116,000,000.0
Property and equipment impairment loss 0 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 38,300,000 35,900,000  
Expected self-insurance recoveries from excess cost insurance 3,300,000 4,100,000  
Amount received from insurance settlement 4,700,000    
Advertising and promotion expenses, net of vendor allowances 16,300,000 14,500,000 14,600,000
Depreciation expense included in costs of goods sold totaled $ 16,300,000 16,400,000 15,200,000
Fluid dairy revenues recognition 44.10%    
Vendor allowances applied as a reduction of merchandise costs $ 151,900,000 146,900,000 128,900,000
Vendor advertising allowances recorded as a reduction of advertising expense 8,200,000 8,900,000 $ 8,500,000
401(k) [Member]      
Summary of Significant Accounting Policies [Line Items]      
Liability to plan participants $ 32,500,000 $ 28,900,000  
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 72    
Georgia [Member]      
Summary of Significant Accounting Policies [Line Items]      
Number of locations | item 64    
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    
Hurricane Helene [Member]      
Summary of Significant Accounting Policies [Line Items]      
Number of stores closed | item 3