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Summary Of Significant Accounting Policies (Details) | 12 Months Ended
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Sep. 29, 2018 USD ($) segment item | Sep. 30, 2017 USD ($) | Sep. 24, 2016 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of locations | item | 200 |  |
Number of operating segments | segment | 1 |  |
Outstanding checks in excess of bank balances | $ 0 | $ 0 |
Short-term investments and certificates of deposit | 0 |  |
Demand deposits | $ 5,900,000 |  |
Number of banks | item | 3 |  |
FDIC insurance limit per bank | $ 250,000 |  |
Total depreciation expense | 113,100,000 | 110,900,000 | $ 106,600,000
Liability coverage per occurrence for workers compensation | 750,000 |  |
Liability coverage for general liability | 500,000 |  |
Liability coverage per covered person for medical care benefits | 450,000 |  |
Company's self insurance reserves | 34,700,000 | 35,500,000 |
Expected self-insurance recoveries from excess cost insurance | 4,600,000 | 4,800,000 |
Undrawn letters of credit | $ 8,900,000 |  |
Expiry date of undrawn letters of credit, Start | Sep. 01, 2019 |  |
Expiry date of undrawn letters of credit, End | Oct. 31, 2019 |  |
Advertising and promotion expenses, net of vendor allowances | $ 12,600,000 | 12,500,000 | 13,300,000
Depreciation expense included in costs of goods sold totaled | $ 14,400,000 | 15,400,000 | 16,000,000
Fluid dairy revenues recognition | 56.00% |  |
Vendor allowances applied as a reduction of merchandise costs | $ 116,500,000 | 116,600,000 | 115,800,000
Vendor advertising allowances recorded as a reduction of advertising expense | $ 14,100,000 | $ 13,800,000 | $ 13,500,000
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 | 69 |  |
South Carolina [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of locations | item | 36 |  |
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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