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Summary Of Significant Accounting Policies (Details) | 12 Months Ended
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Sep. 26, 2015 USD ($) segment item | Sep. 27, 2014 USD ($) | Sep. 28, 2013 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of locations | item | 201 |  |
Number of segments | segment | 1 |  |
Outstanding checks in excess of bank balances | $ 14,400,000 | $ 15,500,000 |
Demand deposits | $ 3,200,000 |  |
Number of banks | item | 3 |  |
FDIC insurance limit per bank | $ 250,000 |  |
Total depreciation expense | 102,900,000 | 97,700,000 | $ 94,900,000
Capitalized loan costs | 9,300,000 | 10,600,000 |
Accumulated amortization | 3,700,000 | 2,400,000 |
Costs to be amortized over the life of the underlying debt instrument or lease, per year. | 1,300,000 |  |
Write off of capitalized loan costs |  |  | 15,300,000
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 | 325,000 |  |
Company's self insurance reserves | 36,300,000 | 29,900,000 |
Expected self-insurance recoveries from excess cost insurance | 4,900,000 |  |
Undrawn letters of credit | $ 9,000,000 |  |
Expiry date of undrawn letters of credit, Start | Nov. 01, 2015 |  |
Expiry date of undrawn letters of credit, End | Sep. 01, 2016 |  |
Advertising and promotion expenses, net of vendor allowances | $ 12,100,000 | 12,300,000 | 13,900,000
Depreciation expense included in costs of goods sold totaled | $ 15,700,000 | 16,700,000 | 14,200,000
Fluid dairy revenues recognition | 57.00% |  |
Vendor allowances applied as a reduction of merchandise costs | $ 115,800,000 | 126,700,000 | 121,900,000
Vendor advertising allowances recorded as a reduction of advertising expense | $ 14,300,000 | $ 14,800,000 | $ 14,500,000
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 |  |
Georgia [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of locations | item | 71 |  |
North Carolina [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of locations | item | 71 |  |
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 | 20 |  |
Virginia [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of locations | item | 2 |  |
Alabama [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of locations | item | 1 |  |

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