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Goodwill And Intangible Assets (Changes in Carrying Amount of Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jul. 07, 2024	Sep. 29, 2024	Oct. 01, 2023	Oct. 02, 2022
Goodwill [Roll Forward]
Goodwill		$ 323,833	$ 329,986	$ 366,821
Accumulated impairment losses		(162,624)	0	0
Goodwill, beginning balance		329,986	366,821
Impairment of goodwill		(162,624)	0	0
Reclassified to assets held for sale		(609)	(1,291)
Goodwill, ending balance		$ 161,209	329,986	366,821
Impairment Of Intangible Asset, Finite-Lived, Statement Of Income Or Comprehensive Income, Extensible Enumeration Not Disclosed Flag		impairment
Del Taco
Goodwill [Roll Forward]
Goodwill, beginning balance			319,722
Goodwill related to the sale of company-operated restaurants		$ (5,544)	(35,472)
Goodwill, ending balance				319,722
Jack in the Box
Goodwill [Roll Forward]
Goodwill related to the sale of company-operated restaurants			(72)
Jack in the Box
Goodwill [Roll Forward]
Goodwill		135,827	136,027	136,099
Accumulated impairment losses		0	0	0
Goodwill, beginning balance		136,027	136,099
Impairment of goodwill		0
Reclassified to assets held for sale		(200)	0
Goodwill, ending balance		135,827	136,027	136,099
Jack in the Box | Del Taco
Goodwill [Roll Forward]
Goodwill related to the sale of company-operated restaurants		0	0
Jack in the Box | Jack in the Box
Goodwill [Roll Forward]
Goodwill related to the sale of company-operated restaurants			(72)
Del Taco
Goodwill [Roll Forward]
Goodwill		188,006	193,959	230,722
Accumulated impairment losses		(162,624)	0	0
Goodwill, beginning balance		193,959	230,722
Impairment of goodwill	$ 162,600	(162,624)
Reclassified to assets held for sale		(409)	(1,291)
Goodwill, ending balance		25,382	193,959	$ 230,722
Impairment of long-lived assets		100
Del Taco | Del Taco
Goodwill [Roll Forward]
Goodwill related to the sale of company-operated restaurants		$ (5,544)	(35,472)
Del Taco | Jack in the Box
Goodwill [Roll Forward]
Goodwill related to the sale of company-operated restaurants			$ 0

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