SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment Owned, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 27, 2023	Dec. 28, 2022	Dec. 29, 2021
Property and Equipment, Net
Capitalized Internal Wages	$ 1.8	$ 1.5	$ 1.4
General and Administrative Expense
Property and Equipment, Net
Abandoned Site And Other Site Selection Cost	$ 0.2
General and Administrative Expense | Maximum
Property and Equipment, Net
Abandoned Site And Other Site Selection Cost		$ 0.1	$ 0.1
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