REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	4 Months Ended
	Jan. 21, 2024	Jan. 22, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 487,498	$ 527,096
Jack in the Box restaurant operations
Disaggregation of Revenue [Line Items]
Revenues	368,340	366,917
Del Taco
Disaggregation of Revenue [Line Items]
Revenues	119,158	160,179
Company restaurant sales
Disaggregation of Revenue [Line Items]
Revenues	224,040	270,191
Company restaurant sales | Jack in the Box restaurant operations
Disaggregation of Revenue [Line Items]
Revenues	132,057	126,142
Company restaurant sales | Del Taco
Disaggregation of Revenue [Line Items]
Revenues	91,983	144,049
Franchise rental revenues
Disaggregation of Revenue [Line Items]
Revenues	113,196	108,830
Franchise rental revenues | Jack in the Box restaurant operations
Disaggregation of Revenue [Line Items]
Revenues	105,578	106,096
Franchise rental revenues | Del Taco
Disaggregation of Revenue [Line Items]
Revenues	7,618	2,734
Franchise royalties
Disaggregation of Revenue [Line Items]
Revenues	70,777	74,503
Franchise royalties | Jack in the Box restaurant operations
Disaggregation of Revenue [Line Items]
Revenues	61,323	67,569
Franchise royalties | Del Taco
Disaggregation of Revenue [Line Items]
Revenues	9,454	6,934
Marketing fees
Disaggregation of Revenue [Line Items]
Revenues	68,951	65,998
Marketing fees | Jack in the Box restaurant operations
Disaggregation of Revenue [Line Items]
Revenues	61,220	60,344
Marketing fees | Del Taco
Disaggregation of Revenue [Line Items]
Revenues	7,731	5,654
Technology and sourcing fees
Disaggregation of Revenue [Line Items]
Revenues	7,981	5,687
Technology and sourcing fees | Jack in the Box restaurant operations
Disaggregation of Revenue [Line Items]
Revenues	6,142	4,969
Technology and sourcing fees | Del Taco
Disaggregation of Revenue [Line Items]
Revenues	1,839	718
Franchise fees and other services
Disaggregation of Revenue [Line Items]
Revenues	2,553	1,887
Franchise fees and other services | Jack in the Box restaurant operations
Disaggregation of Revenue [Line Items]
Revenues	2,020	1,797
Franchise fees and other services | Del Taco
Disaggregation of Revenue [Line Items]
Revenues	$ 533	$ 90