SEGMENT REPORTING - Schedule of Operating Segments (Details) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Apr. 14, 2024		Apr. 16, 2023		Apr. 14, 2024	Apr. 16, 2023
Segment Reporting Information [Line Items]
Revenues		$ 365,347		$ 395,744		$ 852,845	$ 922,840
Depreciation and amortization		13,906		14,598		32,379	34,000
Acquisition, integration, and strategic initiatives	[1]	4,268		1,259		9,889	2,896
Share-based compensation		3,841		2,398		8,661	5,932
Net COLI gains		(1,232)		(844)		(6,066)	(6,568)
Losses (gains) on the sale of company-operated restaurants		1,065		(704)		1,319	(4,529)
Gains on acquisition of restaurants		0	[2]	0	[2]	2,357	0
Amortization of favorable and unfavorable leases and subleases, net		107		826		231	1,359
Earnings from operations		54,190		61,639		133,670	162,570
Jack in the Box restaurant operations
Segment Reporting Information [Line Items]
Revenues		276,262		274,832		644,602	641,749
Segment operating profit		84,545		84,648		200,588	213,428
Del Taco
Segment Reporting Information [Line Items]
Revenues		89,085		120,912		208,243	281,091
Segment operating profit		9,646		12,271		20,387	28,507
Corporate Segment
Segment Reporting Information [Line Items]
Segment operating profit		$ (18,046)		$ (17,747)		$ (43,249)	$ (46,275)

[1] Acquisition, integration, and strategic initiatives are related to the acquisition and integration of Del Taco, as well as strategic consulting fees.

[2] gains on acquisition of 9 Del Taco restaurants.