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GOODWILL AND INTANGIBLE ASSETS, NET - Changes in Carrying Amount of Goodwill - (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Jul. 06, 2025	Apr. 13, 2025	Jul. 07, 2024	Jul. 06, 2025	Sep. 29, 2024
Goodwill [Roll Forward]
Goodwill	$ 330,306			$ 330,306	$ 323,833
Accumulated impairment losses	(194,280)			(194,280)	(162,624)
Goodwill, beginning balance				161,209
Impairment of goodwill				31,656
Acquisition of Del Taco company-operated restaurants				6,326
Reclassified from (to) assets held for sale				147
Goodwill, ending balance	136,026			136,026
Jack in the Box restaurant operations
Goodwill [Roll Forward]
Goodwill	136,026			136,026	135,827
Accumulated impairment losses	0			0	0
Goodwill, beginning balance				135,827
Impairment of goodwill				0
Acquisition of Del Taco company-operated restaurants				0
Reclassified from (to) assets held for sale				199
Goodwill, ending balance	136,026			136,026
Del Taco
Goodwill [Roll Forward]
Goodwill	194,280			194,280	188,006
Accumulated impairment losses	(194,280)			(194,280)	$ (162,624)
Goodwill, beginning balance				25,382
Impairment of goodwill		$ 25,300	$ 162,600	31,656
Acquisition of Del Taco company-operated restaurants	6,300			6,326
Reclassified from (to) assets held for sale				(52)
Goodwill, ending balance	$ 0			$ 0

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