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Business Combination (Purchase Consideration) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 7 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 08, 2022 | Oct. 02, 2022 | Sep. 29, 2024 | Oct. 01, 2023 | Oct. 02, 2022 | Oct. 03, 2021
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration transferred |  |  | $ 86 | $ 0 | $ 297 |
Common Stock |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Del Taco shares outstanding as of March 8, 2022 (in shares) |  | 82,580,599 | 82,825,851 | 82,645,814 | 82,580,599 | 82,536,059
Total Del Taco shares outstanding (in shares) |  | 82,580,599 | 82,825,851 | 82,645,814 | 82,580,599 | 82,536,059
Del Taco |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Del Taco shares outstanding as of March 8, 2022 (in shares) | 36,442,000 | 37,610,000 |  |  | 37,610,000 |
Total Del Taco shares outstanding (in shares) | 36,442,000 | 37,610,000 |  |  | 37,610,000 |
Total cash consideration paid to selling shareholders | $ 470,500 |  |  |  |  |
Business acquisition, transaction costs | 7,141 |  |  |  |  |
Replacement share-based payment awards pre-combination vesting expense | 449 |  |  |  |  |
Consideration transferred | 593,309 |  |  |  |  |
Del Taco | Syndicated Credit Facility | Del Taco |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Del Taco closing indebtedness settled by Jack in the Box | $ 115,219 |  |  |  |  |
Del Taco | Common Stock |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Merger Consideration (per Del Taco share) (in dollars per share) | $ 12.51 |  |  |  |  |
Del Taco | Del Taco RSAs subject to accelerated vesting |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Del Taco subject to accelerated vesting (in shares) |  | 805,000 |  |  |  |
Del Taco | Del Taco RSUs subject to accelerated vesting |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Del Taco subject to accelerated vesting (in shares) |  | 70,000 |  |  |  |
Del Taco | Del Taco options subject to accelerated vesting |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Del Taco subject to accelerated vesting (in shares) |  | 292,000 |  |  |  |

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