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Summary of Significant Accounting Policies (Details) | 12 Months Ended
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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 |  |

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