Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jul. 07, 2024	Sep. 29, 2024	Oct. 01, 2023	Oct. 02, 2022
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues		$ 1,571,306	$ 1,692,306	$ 1,468,083
Segment operating profit		314,207	339,039	338,417
Depreciation and amortization		59,776	62,287	56,100
Acquisition, integration and strategic initiatives		15,631	9,112	20,081
Share-based compensation expense		13,471	11,205	7,122
Net COLI (gains) losses		(14,390)	(5,953)	9,911
Goodwill impairment		162,624	0	0
Gains on the sale of company-operated restaurants		(3,255)	(17,998)	(3,878)
Gains on acquisition of restaurants		(2,702)	0	(309)
Amortization of sublease assets and liabilities, net		516	1,633	1,120
Earnings from operations		82,536	278,753	248,270
Jack in the Box
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues		1,197,420	1,195,311	1,151,188
Segment operating profit		362,377	381,171	383,794
Goodwill impairment		0
Del Taco
Segment Reporting, Asset Reconciling Item [Line Items]
Revenues		373,886	496,995	316,895
Segment operating profit		28,968	45,730	62,353
Goodwill impairment	$ (162,600)	162,624
Corporate Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Segment operating profit		$ (77,138)	$ (87,862)	$ (107,730)