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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impairment of Property and Equipment and ROU Assets (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 25, 2024
USD ($)
Sep. 27, 2023
USD ($)
restaurant
Sep. 25, 2024
USD ($)
Sep. 27, 2023
USD ($)
restaurant
Dec. 27, 2023
USD ($)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES          
Asset impairment charges | $ $ 0.0 $ 1.0 $ 0.0 $ 1.0 $ 1.0
Maximum          
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES          
Closed-store reserve expense | $ $ 0.1 $ 0.1 $ 0.1 $ 0.1  
California          
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES          
Number of restaurants with ROU asset impairment charges | restaurant   1   1  
Nevada          
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES          
Number of restaurants with ROU asset impairment charges | restaurant   1   1