Segment Reporting (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 01, 2023	Oct. 02, 2022	Oct. 03, 2021	Sep. 27, 2020
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues	$ 1,692,306	$ 1,468,083	$ 1,143,670
Total segment operating profit	339,039	338,726	327,157
Depreciation and amortization	62,287	56,100	46,500
Acquisition, integration and strategic initiatives	9,112	20,081	7
Share-based compensation expense	11,205	7,122	4,048
Net COLI losses (gains)	(5,953)	9,911	(9,141)
Gains on the sale of company-operated restaurants	(17,998)	(3,878)	(4,203)
Amortization of sublease assets and liabilities, net	1,633	1,120	0
Earnings from operations	278,753	248,270	289,946
Total capital expenditures	74,954	46,475	41,008
Jack in the Box
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues	1,195,311	1,151,188	1,143,670	$ 1,143,670
Total segment operating profit	308,548	310,745	327,157
Depreciation and amortization	35,973	39,895	46,500
Total capital expenditures	53,692	31,601	41,008
Del Taco
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues	496,995	316,895	0
Total segment operating profit	30,491	27,981	0
Depreciation and amortization	26,314	16,205	0
Total capital expenditures	$ 21,262	$ 14,874	$ 0