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GOODWILL AND INTANGIBLE ASSETS, NET - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Jul. 06, 2025	Apr. 13, 2025	Jul. 07, 2024	Jul. 06, 2025	Jul. 07, 2024
Goodwill [Line Items]
Impairment of goodwill				$ 31,656
Acquisition of Del Taco company-operated restaurants				6,326
Operating restaurant impairment charges	$ 1,058		$ 136	2,935	$ 136
Del Taco
Goodwill [Line Items]
Acquisition of Del Taco company-operated restaurants	6,326		0	6,326	$ 0
Trade Names
Goodwill [Line Items]
Operating restaurant impairment charges		$ 177,900		177,900
Del Taco
Goodwill [Line Items]
Impairment of goodwill		$ 25,300	162,600	31,656
Acquisition of Del Taco company-operated restaurants	$ 6,300			$ 6,326
Operating restaurant impairment charges			$ 2,200

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