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Nature of Operations and Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2020 | Mar. 31, 2020 | Oct. 02, 2022 USD ($) restaurant | Oct. 03, 2021 USD ($) | Sep. 27, 2020 USD ($)
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Restricted cash |  |  | $ 27,150 | $ 18,222 |
Depreciation |  |  | 55,800 | 46,500 | $ 52,800
Deferred gift card income |  |  | 18,525 | 17,892 |
Amounts recognized on unredeemed gift card balances |  |  | 700 | $ 600 | $ 500
General liability and workers' comp estimated claims to be paid by insurance providers |  |  | $ 31,900 |  |
Contractual contributions | 4.00% | 2.00% | 5.00% | 5.00% | 5.00%
Accrued advertising costs |  |  | $ 3,500 | $ 9,500 |
Marketing and advertising expense |  |  | $ 32,600 | 19,600 | $ 17,100
Entity Operated Units |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of restaurants | restaurant |  |  | 146 |  |
Franchised Units |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of restaurants | restaurant |  |  | 2,035 |  |
Sales Concentration Risk | Revenue Benchmark | Del Taco |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 4.00% |  |
Other Assets |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cash surrender value of life insurance |  |  | $ 108,900 | 123,600 |
Accrued Liabilities |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred gift card income |  |  | $ 4,100 | $ 2,200 |
Minimum |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property, plant and equipment assigned lives |  |  | 1 year |  |
Maximum |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property, plant and equipment assigned lives |  |  | 35 years |  |

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