REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 09, 2023	Jul. 10, 2022	Jul. 09, 2023	Jul. 10, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 396,942	$ 398,305	$ 1,319,782	$ 1,065,310
Jack in the Box
Disaggregation of Revenue [Line Items]
Revenues	280,211	271,976	921,960	876,024
Del Taco
Disaggregation of Revenue [Line Items]
Revenues	116,731	126,329	397,822	189,286
Company restaurant sales
Disaggregation of Revenue [Line Items]
Revenues	198,516	215,231	671,311	486,596
Company restaurant sales | Jack in the Box
Disaggregation of Revenue [Line Items]
Revenues	96,820	100,899	318,451	315,205
Company restaurant sales | Del Taco
Disaggregation of Revenue [Line Items]
Revenues	101,696	114,332	352,860	171,391
Franchise rental revenues
Disaggregation of Revenue [Line Items]
Revenues	86,248	80,068	278,598	259,723
Franchise rental revenues | Jack in the Box
Disaggregation of Revenue [Line Items]
Revenues	83,271	78,278	270,277	257,069
Franchise rental revenues | Del Taco
Disaggregation of Revenue [Line Items]
Revenues	2,977	1,790	8,321	2,654
Franchise royalties
Disaggregation of Revenue [Line Items]
Revenues	53,503	49,652	180,064	152,878
Franchise royalties | Jack in the Box
Disaggregation of Revenue [Line Items]
Revenues	47,373	44,291	161,343	144,872
Franchise royalties | Del Taco
Disaggregation of Revenue [Line Items]
Revenues	6,130	5,361	18,721	8,006
Marketing fees
Disaggregation of Revenue [Line Items]
Revenues	52,327	46,979	169,421	146,328
Marketing fees | Jack in the Box
Disaggregation of Revenue [Line Items]
Revenues	47,323	42,620	154,153	139,811
Marketing fees | Del Taco
Disaggregation of Revenue [Line Items]
Revenues	5,004	4,359	15,268	6,517
Technology and sourcing fees
Disaggregation of Revenue [Line Items]
Revenues	4,881	3,968	15,111	12,748
Technology and sourcing fees | Jack in the Box
Disaggregation of Revenue [Line Items]
Revenues	4,037	3,548	12,881	12,123
Technology and sourcing fees | Del Taco
Disaggregation of Revenue [Line Items]
Revenues	844	420	2,230	625
Franchise fees and other services
Disaggregation of Revenue [Line Items]
Revenues	1,467	2,407	5,277	7,037
Franchise fees and other services | Jack in the Box
Disaggregation of Revenue [Line Items]
Revenues	1,387	2,340	4,855	6,944
Franchise fees and other services | Del Taco
Disaggregation of Revenue [Line Items]
Revenues	$ 80	$ 67	$ 422	$ 93