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Business Combination (Narrative) (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 08, 2022 | Oct. 02, 2022 | Jul. 10, 2022 | Oct. 02, 2022 | Oct. 03, 2021 | Sep. 27, 2020
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | $ 366,821,000 |  | $ 366,821,000 | $ 47,774,000 | $ 47,161,000
Del Taco |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | 230,722,000 |  | 230,722,000 | 0 | 0
Revenues |  |  | $ 316,900,000 |  |  |
Net earnings |  | 6,500,000 |  |  |  |
Jack in the Box |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | 136,099,000 |  | $ 136,099,000 | $ 47,774,000 | $ 47,161,000
Del Taco |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration transferred | $ 593,309,000 |  |  |  |  |
Business acquisition, transaction costs | 7,141,000 |  |  |  |  |
Vesting period |  |  |  | 1 year |  |
Acquisition related costs |  |  |  | $ 12,300,000 |  |
Purchase price allocation, adjustments |  | 300,000 |  | 300,000 |  |
Goodwill | 281,710,000 | $ 319,722,000 |  | $ 319,722,000 |  |
Goodwill, expected tax deductible amount | 0 |  |  |  |  |
Sublease liability | $ 6,000,000 |  |  |  |  |
Sublease useful life | 15 years |  |  |  |  |
Del Taco | Del Taco |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Ownership acquired | 100.00% |  |  |  |  |
Del Taco | Common Stock |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Conversion of shares into cash (in dollars per share) | $ 12.51 |  |  |  |  |
Del Taco | Syndicated Credit Facility | Del Taco |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Repayments of debt | $ 115,219,000 |  |  |  |  |

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