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BASIS OF PRESENTATION - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 09, 2023 USD ($) | Jul. 10, 2022 USD ($) | Apr. 16, 2023 USD ($) | Jul. 09, 2023 USD ($) restaurant reporting_unit segment | Jul. 10, 2022 USD ($)
Net Investment Income [Line Items] |  |  |  |  |
Number of operating segments | segment |  |  |  | 2 |
Contractual obligation | $ |  |  | $ 0.0 | $ 0.1 |
Marketing and advertising expense | $ | $ 9.0 | $ 9.8 |  | $ 30.3 | $ 22.9
Number of reporting units | reporting_unit |  |  |  | 2 |
Del Taco |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Fair value in excess of carrying value of intangible assets, percent | 9.00% |  |  | 9.00% |
Trademarks | Del Taco |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Fair value in excess of carrying value of intangible assets, percent | 13.00% |  |  | 13.00% |
Jack in the Box |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Contractual obligation (percent) |  |  |  | 5.00% | 5.00%
Del Taco |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Contractual obligation (percent) |  |  |  | 4.00% |
Company operated | Jack in the Box |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Number of operating segments |  |  |  | 140 |
Company operated | Del Taco |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Number of operating segments |  |  |  | 221 |
Franchise-operated | Jack in the Box |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Number of operating segments |  |  |  | 2,051 |
Franchise-operated | Del Taco |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Number of operating segments |  |  |  | 373 |

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