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BASIS OF PRESENTATION - Narrative (Details) $ in Millions | 4 Months Ended
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Jan. 19, 2025 USD ($) restaurant reporting_unit segment | Jan. 21, 2024 USD ($)
Net Investment Income [Line Items] |  |
Number of operating segments | segment | 2 |
Marketing and advertising expense | $ | $ 10.5 | $ 10.4
Number of reporting units | reporting_unit | 2 |
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 | 152 |
Company operated | Del Taco |  |
Net Investment Income [Line Items] |  |
Number of operating segments | 119 |
Franchise-operated | Jack in the Box restaurant operations |  |
Net Investment Income [Line Items] |  |
Number of operating segments | 2,038 |
Franchise-operated | Del Taco |  |
Net Investment Income [Line Items] |  |
Number of operating segments | 470 |

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