SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment of Property and Equipment and ROU Assets (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($)	Dec. 25, 2024 USD ($) restaurant	Dec. 27, 2023 USD ($) restaurant
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Operating Lease ROU assets	$ 167,972	$ 170,494
California
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Asset impairment charges			$ 1,500
Number of restaurants with ROU asset impairment charges | restaurant			1
Nevada
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Asset impairment charges		$ 100
Number of restaurants with long-lived assets impairment charges | restaurant		2	1
Closed Or Subleased Restaurant Locations
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Operating Lease ROU assets	28,900	$ 39,100
Closed-store reserve expense		$ 100	$ 200
Closed Or Subleased Restaurant Locations | Maximum
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Closed-store reserve expense	$ 100