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EMPLOYEE BENEFIT PLANS - Fair Value of Company's Pension Plan Assets by Asset Category (Details) - USD ($)
$ in Thousands
Dec. 26, 2020
Dec. 28, 2019
Dec. 29, 2018
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 324,752 $ 357,181 $ 305,709
Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 21,629 3,410  
Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 63,465 91,998  
Debt Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 99,188 129,965  
Mutual Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 72,207 74,956  
Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 68,263 56,852  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 36,322 57,165  
Level 1 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 20,163 2,388  
Level 1 | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8,633 7,621  
Level 1 | Debt Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 40,281  
Level 1 | Mutual Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7,018 6,324  
Level 1 | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 508 551  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 287,114 298,502  
Level 2 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,466 1,022  
Level 2 | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 54,832 84,377  
Level 2 | Debt Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 99,188 89,684  
Level 2 | Mutual Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 65,189 68,632  
Level 2 | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 66,439 54,787  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,316 1,514  
Level 3 | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Level 3 | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Level 3 | Debt Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Level 3 | Mutual Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Level 3 | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 1,316 $ 1,514