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Nature of Operations and Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands | 12 Months Ended
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Sep. 28, 2025 USD ($) reporting_unit restaurant segment | Sep. 29, 2024 USD ($) | Oct. 01, 2023 USD ($)
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Restricted cash | $ 30,282 | $ 29,422 |
Capitalized software implementation costs | 11,000 | 11,100 |
Amortization expense for software implementation costs | 2,400 | 4,500 | $ 5,000
Depreciation | $ 57,800 | 59,200 | 61,700
Number of operating segments | segment | 2 |  |
Number of reporting units | reporting_unit | 2 |  |
Deferred gift card income | $ 393 | 0 |
Amounts recognized on unredeemed gift card balances | 600 | 800 | $ 1,600
General liability and workers' comp estimated claims to be paid by insurance providers | $ 28,100 | $ 27,900 |
Contractual contributions | 5.00% | 5.00% | 5.00%
Marketing Fund, Incremental Contributions | $ 6,300 | $ 500 | $ 200
Marketing and advertising expense | 39,300 | 35,000 | $ 38,900
Del Taco |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Accrued advertising costs | $ (300) | (800) |
Del Taco | Entity Operated Units |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of restaurants | restaurant | 132 |  |
Del Taco | Franchised Units |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of restaurants | restaurant | 444 |  |
Jack in the Box |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Accrued advertising costs | $ 200 | $ 800 |
Jack in the Box | Entity Operated Units |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of restaurants | restaurant | 150 |  |
Jack in the Box | Franchised Units |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of restaurants | restaurant | 1,986 |  |
Sales Concentration Risk | Revenue Benchmark | Del Taco |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Concentration risk, percentage | 4.00% | 4.00% | 4.00%
Other Assets |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Cash surrender value of life insurance | $ 135,500 | $ 129,700 |
Accrued Liabilities |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |
Deferred gift card income | $ 2,800 | $ 2,700 |
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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