SEGMENT REPORTING - Schedule of Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 17, 2022	Apr. 11, 2021	Apr. 17, 2022	Apr. 11, 2021
Segment Reporting Information [Line Items]
Revenues:	$ 322,294	$ 257,217	$ 667,005	$ 595,758
Segment operating profit	67,377	74,111	158,040	172,766
Depreciation and amortization	11,545	10,696	24,041	25,267
Acquisition, integration, and restructuring costs	13,098	(2)	16,111	4
Share-based compensation	2,916	1,605	3,934	2,836
Cash surrender value of COLI policies, net	2,136	(1,544)	2,580	(6,340)
Gains on the sale of company-operated restaurants	(810)	(1,532)	(858)	(2,815)
Amortization of favorable and unfavorable leases and subleases, net	248	0	248	0
Earnings from operations	38,244	64,888	111,984	153,814
Total capital expenditures	11,380	15,852	20,781	22,928
Jack in the Box
Segment Reporting Information [Line Items]
Revenues:	259,337	257,217	604,048	595,758
Segment operating profit	61,321	74,111	151,984	172,766
Depreciation and amortization	9,340	10,696	21,836	25,267
Total capital expenditures	7,929	15,852	17,330	22,928
Del Taco
Segment Reporting Information [Line Items]
Revenues:	62,957	0	62,957	0
Segment operating profit	6,056	0	6,056	0
Depreciation and amortization	2,205	0	2,205	0
Total capital expenditures	$ 3,451	$ 0	$ 3,451	$ 0