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Nature of Operations and Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Sep. 27, 2020 USD ($) restaurant | Sep. 29, 2019 USD ($) restaurant | Sep. 30, 2018 USD ($) restaurant | Sep. 30, 2019 USD ($)
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of restaurants | restaurant |  |  |  | 2,241 | 2,243 | 2,237 |
Number of weeks per fiscal year |  |  |  | 52 | 52 | 52 |
Business outside of dining rooms (percentage) |  |  |  | 90.00% |  |  |
Depreciation |  |  |  | $ 52,800 | $ 55,200 | $ 59,400 |
Intangible assets, carrying value |  |  |  | 277 | 425 |  | $ 39
Amounts recognized on unredeemed gift card balances |  |  |  | 500 | 500 | 600 |
General liability and workers' comp estimated claims to be paid by insurance providers |  |  |  | $ 1,900 | 3,600 |  |
Contractual contributions |  | 4.00% |  | 5.00% |  |  |
Collection period for marketing fees |  | 24 months |  |  |  |  |
Uncollected postponed marketing fees |  |  |  | $ 16,100 |  |  |
Accrued advertising costs |  |  |  | 8,300 | 300 |  |
Incremental corporate advertising contributions |  |  |  | 0 | 2,000 | 6,200 |
Marketing and advertising expense |  |  |  | 17,100 | 19,000 | $ 28,800 |
Deferred tax assets |  |  |  | 72,322 | 85,564 |  | $ 86,570
Other Assets |  |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cash surrender value of life insurance |  |  |  | 113,800 | $ 112,800 |  |
Uncollected postponed marketing fees |  |  |  | 3,500 |  |  |
Accounts Receivable |  |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Uncollected postponed marketing fees |  |  |  | $ 12,600 |  |  |
Forecast |  |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Collection period for marketing fees |  |  | 3 months |  |  |  |
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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