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RESTRICTED CASH AND INVESTMENTS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 25, 2023
Jun. 26, 2022
Jun. 25, 2023
Jun. 26, 2022
Dec. 25, 2022
Restricted Cash and Investments [Line Items]          
Cash collateral held by insurance carriers $ 30,064   $ 30,064   $ 29,567
Cash and cash equivalents held in Trust 27,153   27,153   30,857
Investments held in Trust 117,206   117,206   123,678
Company owned life insurance policies 30,801   30,801   26,479
Other restricted cash and cash equivalents 882   882   3,153
Restricted cash and investments 206,106   206,106   213,734
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]          
Amortized cost of held-to-maturity investments 117,206   117,206   123,678
Gross unrealized gains 1   1   6
Gross unrealized losses (3,808)   (3,808)   (4,159)
Fair value 113,399   113,399   119,525
Held-to-maturity securities, amortized cost [Abstract]          
Amortized cost of held-to-maturity investments 117,206   117,206   123,678
Held-to-maturity securities, fair value [Abstract]          
Fair value 113,399   113,399   119,525
Unrealized gains (losses) on Investments 1,558 $ (3,549) 1,975 $ (5,560)  
Municipal debt securities          
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]          
Amortized cost of held-to-maturity investments 36,533   36,533   42,892
Gross unrealized gains 0   0   2
Gross unrealized losses (544)   (544)   (463)
Fair value 35,989   35,989   42,431
Held-to-maturity securities, amortized cost [Abstract]          
Amortized cost of held-to-maturity investments 36,533   36,533   42,892
Held-to-maturity securities, fair value [Abstract]          
Fair value 35,989   35,989   42,431
Corporate debt securities          
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]          
Amortized cost of held-to-maturity investments 75,087   75,087   79,736
Gross unrealized gains 1   1   4
Gross unrealized losses (3,191)   (3,191)   (3,643)
Fair value 71,897   71,897   76,097
Held-to-maturity securities, amortized cost [Abstract]          
Amortized cost of held-to-maturity investments 75,087   75,087   79,736
Held-to-maturity securities, fair value [Abstract]          
Fair value 71,897   71,897   76,097
Agency mortgage-backed securities          
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]          
Amortized cost of held-to-maturity investments 4,586   4,586   50
Gross unrealized gains 0   0   0
Gross unrealized losses (16)   (16)   (2)
Fair value 4,570   4,570   48
Held-to-maturity securities, amortized cost [Abstract]          
Amortized cost of held-to-maturity investments 4,586   4,586   50
Held-to-maturity securities, fair value [Abstract]          
Fair value 4,570   4,570   48
U.S. government and agency securities          
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]          
Amortized cost of held-to-maturity investments 1,000   1,000   1,000
Gross unrealized gains 0   0   0
Gross unrealized losses (57)   (57)   (51)
Fair value 943   943   949
Held-to-maturity securities, amortized cost [Abstract]          
Amortized cost of held-to-maturity investments 1,000   1,000   1,000
Held-to-maturity securities, fair value [Abstract]          
Fair value 943   943   $ 949
Restricted cash and investments          
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]          
Amortized cost of held-to-maturity investments 117,206   117,206    
Fair value 113,399   113,399    
Held-to-maturity securities, amortized cost [Abstract]          
Due in one year or less 31,087   31,087    
Due after one year through five years 86,119   86,119    
Amortized cost of held-to-maturity investments 117,206   117,206    
Held-to-maturity securities, fair value [Abstract]          
Due in one year or less 30,716   30,716    
Due after one year through five years 82,683   82,683    
Fair value $ 113,399   $ 113,399