Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jul. 10, 2022	Oct. 02, 2022	Oct. 03, 2021	Sep. 27, 2020	Sep. 29, 2019
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues		$ 1,468,083	$ 1,143,670	$ 1,021,506
Total segment operating profit		338,726	327,157	282,748
Depreciation and amortization		56,100	46,500	52,798
Acquisition, integration, and restructuring costs		20,081	7	1,168
Share-based compensation expense		7,122	4,048	4,394
Net COLI losses (gains)		9,911	(9,141)	(2,935)
Gains on the sale of company-operated restaurants		(3,878)	(4,203)	(3,261)
Amortization of favorable and unfavorable lease contracts, net		1,120	0	0
Earnings from operations		248,270	289,946	230,584
Total capital expenditures		46,475	41,008	19,528
Jack in the Box
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues		1,151,188	1,143,670	1,021,506	$ 1,021,506
Total segment operating profit		310,745	327,157	282,748
Depreciation and amortization		39,895	46,500	52,798
Total capital expenditures		31,601	41,008	19,528
Del Taco
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues	$ 316,895		0	0
Total segment operating profit		27,981	0	0
Depreciation and amortization		16,205	0	0
Total capital expenditures		$ 14,874	$ 0	$ 0