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RESTRICTED CASH AND INVESTMENTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 26, 2021
Dec. 27, 2020
Dec. 29, 2019
Restricted Cash and Investments [Line Items]      
Cash collateral held by insurance carriers $ 28,957 $ 26,025  
Cash and cash equivalents held in Trust 21,590 29,410  
Investments held in Trust 135,419 152,247  
Deferred compensation investments 0 5,915  
Company-owned life insurance policies 32,318 26,267  
Other restricted cash and cash equivalents 2,742 670  
Total restricted cash and investments 221,026 240,534  
Amortized cost 135,419 152,247  
Gross unrealized gain 3,228 6,090  
Gross unrealized losses (563) (41)  
Fair value 138,084 158,296  
Amortized cost      
Total held-to-maturity investments 135,419 152,247  
Fair value      
Total held-to-maturity investments 138,084 158,296  
Unrealized gains (losses) 1,061 723 $ 2,814
Municipal debt securities      
Restricted Cash and Investments [Line Items]      
Amortized cost 56,346 67,287  
Gross unrealized gain 2,159 3,436  
Gross unrealized losses 0 0  
Fair value 58,505 70,723  
Amortized cost      
Total held-to-maturity investments 56,346 67,287  
Fair value      
Total held-to-maturity investments 58,505 70,723  
Corporate debt securities      
Restricted Cash and Investments [Line Items]      
Amortized cost 77,925 83,467  
Gross unrealized gain 995 2,511  
Gross unrealized losses (563) (41)  
Fair value 78,357 85,937  
Amortized cost      
Total held-to-maturity investments 77,925 83,467  
Fair value      
Total held-to-maturity investments 78,357 85,937  
Agency mortgage-backed securities      
Restricted Cash and Investments [Line Items]      
Amortized cost 148 493  
Gross unrealized gain 4 19  
Gross unrealized losses 0 0  
Fair value 152 512  
Amortized cost      
Total held-to-maturity investments 148 493  
Fair value      
Total held-to-maturity investments 152 512  
U.S. government and agency securities      
Restricted Cash and Investments [Line Items]      
Amortized cost 1,000 1,000  
Gross unrealized gain 70 124  
Gross unrealized losses 0 0  
Fair value 1,070 1,124  
Amortized cost      
Total held-to-maturity investments 1,000 1,000  
Fair value      
Total held-to-maturity investments 1,070 $ 1,124  
Restricted Cash and Investments      
Restricted Cash and Investments [Line Items]      
Amortized cost 135,419    
Fair value 138,084    
Amortized cost      
Due in one year or less 23,828    
Due after one year through five years 109,572    
Due after five years through ten years 2,019    
Total held-to-maturity investments 135,419    
Fair value      
Due in one year or less 24,023    
Due after one year through five years 112,010    
Due after five years through ten years 2,051    
Total held-to-maturity investments $ 138,084