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BASIS OF PRESENTATION - Narrative (Details) $ in Thousands | 9 Months Ended
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Jul. 06, 2025 USD ($) reporting_unit restaurant segment | Jul. 07, 2024 USD ($)
Net Investment Income [Line Items] |  |
Number of operating segments | segment | 2 |
Number of reporting units | reporting_unit | 2 |
Franchise advertising and other services expenses | $ | $ 190,191 | $ 200,201
Marketing and advertising expense | $ | $ 25,800 | $ 26,400
Jack in the Box restaurant operations |  |
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 restaurant operations |  |
Net Investment Income [Line Items] |  |
Number of operating segments | 142 |
Company operated | Del Taco |  |
Net Investment Income [Line Items] |  |
Number of operating segments | 132 |
Franchise-operated | Jack in the Box restaurant operations |  |
Net Investment Income [Line Items] |  |
Number of operating segments | 2,026 |
Franchise-operated | Del Taco |  |
Net Investment Income [Line Items] |  |
Number of operating segments | 453 |

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