REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 17, 2022	Apr. 11, 2021	Apr. 17, 2022	Apr. 11, 2021
Disaggregation of Revenue [Line Items]
Revenues:	$ 322,294	$ 257,217	$ 667,005	$ 595,758
Jack in the Box
Disaggregation of Revenue [Line Items]
Revenues:	259,337	257,217	604,048	595,758
Del Taco
Disaggregation of Revenue [Line Items]
Revenues:	62,957	0	62,957	0
Company restaurant sales
Disaggregation of Revenue [Line Items]
Revenues:	151,309	85,962	271,365	200,240
Company restaurant sales | Jack in the Box
Disaggregation of Revenue [Line Items]
Revenues:	94,250	85,962	214,306	200,240
Company restaurant sales | Del Taco
Disaggregation of Revenue [Line Items]
Revenues:	57,059	0	57,059	0
Franchise Rental Revenues
Disaggregation of Revenue [Line Items]
Revenues:	76,556	77,901	179,655	181,650
Franchise Rental Revenues | Jack in the Box
Disaggregation of Revenue [Line Items]
Revenues:	75,692	77,901	178,791	181,650
Franchise Rental Revenues | Del Taco
Disaggregation of Revenue [Line Items]
Revenues:	864	0	864	0
Franchise Royalties
Disaggregation of Revenue [Line Items]
Revenues:	45,578	43,620	103,226	100,963
Franchise Royalties | Jack in the Box
Disaggregation of Revenue [Line Items]
Revenues:	42,933	43,620	100,581	100,963
Franchise Royalties | Del Taco
Disaggregation of Revenue [Line Items]
Revenues:	2,645	0	2,645	0
Marketing Fees
Disaggregation of Revenue [Line Items]
Revenues:	43,548	42,317	99,349	98,093
Marketing Fees | Jack in the Box
Disaggregation of Revenue [Line Items]
Revenues:	41,390	42,317	97,191	98,093
Marketing Fees | Del Taco
Disaggregation of Revenue [Line Items]
Revenues:	2,158	0	2,158	0
Technology and Sourcing Fees
Disaggregation of Revenue [Line Items]
Revenues:	3,780	3,806	8,780	8,896
Technology and Sourcing Fees | Jack in the Box
Disaggregation of Revenue [Line Items]
Revenues:	3,575	3,806	8,575	8,896
Technology and Sourcing Fees | Del Taco
Disaggregation of Revenue [Line Items]
Revenues:	205	0	205	0
Franchise Fees and Other Services
Disaggregation of Revenue [Line Items]
Revenues:	1,523	3,611	4,630	5,916
Franchise Fees and Other Services | Jack in the Box
Disaggregation of Revenue [Line Items]
Revenues:	1,497	3,611	4,604	5,916
Franchise Fees and Other Services | Del Taco
Disaggregation of Revenue [Line Items]
Revenues:	$ 26	$ 0	$ 26	$ 0