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Nature of Operations and Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Oct. 03, 2021 | Sep. 27, 2020 | Sep. 29, 2019
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of weeks per fiscal year |  |  |  | 53 | 52 | 52
Restricted cash |  |  |  | $ 18,222 | $ 37,258 |
Depreciation |  |  |  | 46,500 | 52,800 | $ 55,200
Intangible assets, carrying value |  |  |  | 470 | 277 |
Amounts recognized on unredeemed gift card balances |  |  |  | 600 | 500 | 500
General liability and workers' comp estimated claims to be paid by insurance providers |  |  |  | $ 1,800 | 1,900 |
Contractual contributions |  | 4.00% |  | 5.00% |  |
Collection period for marketing fees |  | 24 months | 3 months |  |  |
Uncollected postponed marketing fees |  |  |  | $ 4,300 |  |
Accrued advertising costs |  |  |  | 9,500 | 8,300 |
Incremental corporate advertising contributions |  |  |  | 0 |  | 2,000
Marketing and advertising expense |  |  |  | 19,600 | 17,100 | $ 19,000
Other Assets |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash surrender value of life insurance |  |  |  | $ 123,600 | $ 113,800 |
Minimum |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment assigned lives |  |  |  | 1 year |  |
Contractual contributions | 2.00% |  |  |  |  |
Maximum |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment assigned lives |  |  |  | 35 years |  |
Contractual contributions | 4.00% |  |  |  |  |

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