SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment Owned, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 25, 2024	Dec. 27, 2023
Property and Equipment, Net
Capitalized internal cost	$ 0.6	$ 0.6	$ 1.8
General and Administrative Expense
Property and Equipment, Net
Abandoned site and other site selection costs	$ 0.1	$ 0.0	$ 0.2
Buildings
Property and Equipment, Net
Estimated useful service lives	20 years
Land improvements | Minimum
Property and Equipment, Net
Estimated useful service lives	3 years
Land improvements | Maximum
Property and Equipment, Net
Estimated useful service lives	30 years
Building improvements | Minimum
Property and Equipment, Net
Estimated useful service lives	3 years
Building improvements | Maximum
Property and Equipment, Net
Estimated useful service lives	10 years
Restaurant equipment | Minimum
Property and Equipment, Net
Estimated useful service lives	3 years
Restaurant equipment | Maximum
Property and Equipment, Net
Estimated useful service lives	10 years
Other equipment | Minimum
Property and Equipment, Net
Estimated useful service lives	2 years
Other equipment | Maximum
Property and Equipment, Net
Estimated useful service lives	10 years