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PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Defined Benefit Plan Obligations and Assets) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 01, 2018
Mar. 26, 2017
Dec. 31, 2017
Dec. 25, 2016
Change in plan assets:        
Fair value of plan assets, beginning of period $ 112,570      
Fair value of plan assets, end of period 113,825      
Pension Benefits        
Change in projected benefit obligation:        
Projected benefit obligation, beginning of period 178,247 $ 167,159    
Interest cost 1,366 1,393    
Actuarial losses (gains) (6,829) 785    
Benefits paid (2,174) (2,237)    
Projected benefit obligation, end of period 170,610 167,100    
Change in plan assets:        
Fair value of plan assets, beginning of period 112,570 97,526    
Actual return on plan assets 541 3,965    
Contributions by employer 2,888 1,926    
Benefits paid (2,174) (2,237)    
Fair value of plan assets, end of period 113,825 101,180    
Funded status:        
Unfunded benefit obligation, end of period (56,785)   $ (65,677)  
Amounts recognized in the Condensed Consolidated Balance Sheets at end of period:        
Current liability (12,163)   (12,168)  
Long-term liability (44,622)   (53,509)  
Recognized liability (56,785)   (65,677)  
Amounts recognized in accumulated other comprehensive income (loss) at end of period:        
Net actuarial loss (gain) 48,081 44,394 54,235 $ 46,494
Other Benefits        
Change in projected benefit obligation:        
Projected benefit obligation, beginning of period 1,603 1,648    
Interest cost 12 13    
Actuarial losses (gains) (48) (24)    
Benefits paid (37) (37)    
Projected benefit obligation, end of period 1,530 1,600    
Change in plan assets:        
Fair value of plan assets, beginning of period 0 0    
Actual return on plan assets 0 0    
Contributions by employer 37 37    
Benefits paid (37) (37)    
Fair value of plan assets, end of period 0 0    
Funded status:        
Unfunded benefit obligation, end of period (1,530)   (1,603)  
Amounts recognized in the Condensed Consolidated Balance Sheets at end of period:        
Current liability (148)   (149)  
Long-term liability (1,382)   (1,454)  
Recognized liability (1,530)   (1,603)  
Amounts recognized in accumulated other comprehensive income (loss) at end of period:        
Net actuarial loss (gain) $ (13) $ (55) $ 35 $ (31)