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FRANCHISE ACQUISITIONS - Schedule of Assets and Liabilities Assumed (Details) $ in Thousands	3 Months Ended						4 Months Ended		9 Months Ended		12 Months Ended
	Jul. 06, 2025 USD ($) restaurants	Apr. 13, 2025 restaurant	Jul. 07, 2024 USD ($)	Jul. 07, 2024 restaurants	Jul. 07, 2024 restaurant	Apr. 14, 2024 restaurant	Jan. 19, 2025 restaurant	Jan. 21, 2024 USD ($)	Jul. 06, 2025 USD ($) restaurant	Jul. 07, 2024 USD ($) restaurants	Sep. 29, 2024 restaurants
Asset Acquisition [Line Items]
Closing and acquisition costs	$ 0		$ 0						$ 0	$ 43
Property and equipment	(5,010)		0						(5,010)	(3,612)
Intangible assets	(165)		0						(165)	(167)
Operating lease right-of-use assets	(9,299)		0						(9,299)	(3,211)
Operating lease liabilities	13,606		0						13,606	4,505
Acquisition of Del Taco company-operated restaurants									6,326
Gains on acquisition of restaurants	$ 0		0						$ (6)	$ (2,357)
Del Taco
Asset Acquisition [Line Items]
Number of restaurants acquired from franchisees	18	0		0	0	0	0		18	9	9
Purchase price	$ 7,193		0					$ 86	$ 7,193	$ 86
Acquisition of Del Taco company-operated restaurants	6,326		0						6,326	0
Gains on acquisition of restaurants	$ 0		$ 0					$ (2,400)	$ 0	$ (2,357)

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