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EMPLOYEE BENEFIT PLANS - Fair Value of Company's Pension Plan Assets by Asset Category (Details) - USD ($)
$ in Thousands
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 304,325 $ 256,903 $ 275,480
Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 564 108  
Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 88,854 69,600  
Debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 22,602 62,563  
Mutual funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 141,364 121,294  
Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 50,941 3,338  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 183,083 188,766  
Level 1 | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 564 108  
Level 1 | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 88,854 63,348  
Level 1 | Debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 18,485 59,294  
Level 1 | Mutual funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 74,708 64,698  
Level 1 | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 472 1,318  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 119,486 66,703  
Level 2 | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Level 2 | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 6,252  
Level 2 | Debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,117 3,269  
Level 2 | Mutual funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 66,656 56,596  
Level 2 | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 48,713 586  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,756 1,434  
Level 3 | Cash      
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 $ 1,756 $ 1,434