REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 14, 2024	Apr. 16, 2023	Apr. 14, 2024	Apr. 16, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 365,347	$ 395,744	$ 852,845	$ 922,840
Jack in the Box restaurant operations
Disaggregation of Revenue [Line Items]
Revenues	276,262	274,832	644,602	641,749
Del Taco
Disaggregation of Revenue [Line Items]
Revenues	89,085	120,912	208,243	281,091
Company restaurant sales
Disaggregation of Revenue [Line Items]
Revenues	167,098	202,604	391,138	472,795
Company restaurant sales | Jack in the Box restaurant operations
Disaggregation of Revenue [Line Items]
Revenues	98,927	95,489	230,984	221,631
Company restaurant sales | Del Taco
Disaggregation of Revenue [Line Items]
Revenues	68,171	107,115	160,154	251,164
Franchise rental revenues
Disaggregation of Revenue [Line Items]
Revenues	85,826	83,520	199,022	192,350
Franchise rental revenues | Jack in the Box restaurant operations
Disaggregation of Revenue [Line Items]
Revenues	79,618	80,910	185,196	187,006
Franchise rental revenues | Del Taco
Disaggregation of Revenue [Line Items]
Revenues	6,208	2,610	13,826	5,344
Franchise royalties (1)
Disaggregation of Revenue [Line Items]
Revenues	52,728	52,058	123,505	126,561
Franchise royalties (1) | Jack in the Box restaurant operations
Disaggregation of Revenue [Line Items]
Revenues	45,414	46,401	106,737	113,970
Franchise royalties (1) | Del Taco
Disaggregation of Revenue [Line Items]
Revenues	7,314	5,657	16,768	12,591
Marketing fees
Disaggregation of Revenue [Line Items]
Revenues	51,451	51,095	120,402	117,093
Marketing fees | Jack in the Box restaurant operations
Disaggregation of Revenue [Line Items]
Revenues	45,423	46,486	106,643	106,830
Marketing fees | Del Taco
Disaggregation of Revenue [Line Items]
Revenues	6,028	4,609	13,759	10,263
Technology and sourcing fees
Disaggregation of Revenue [Line Items]
Revenues	5,888	4,543	13,869	10,230
Technology and sourcing fees | Jack in the Box restaurant operations
Disaggregation of Revenue [Line Items]
Revenues	4,757	3,875	10,899	8,844
Technology and sourcing fees | Del Taco
Disaggregation of Revenue [Line Items]
Revenues	1,131	668	2,970	1,386
Franchise fees and other services
Disaggregation of Revenue [Line Items]
Revenues	2,356	1,924	4,909	3,811
Franchise fees and other services | Jack in the Box restaurant operations
Disaggregation of Revenue [Line Items]
Revenues	2,123	1,671	4,143	3,468
Franchise fees and other services | Del Taco
Disaggregation of Revenue [Line Items]
Revenues	$ 233	$ 253	$ 766	$ 343