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PENSION AND OTHER POSTRETIREMENT BENEFITS (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Dec. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Retirement plan expenses $ 3,900,000 $ 3,100,000  
Accumulated benefit obligation, defined benefit pension plans $ 157,700,000   $ 157,600,000
Weighted average duration of defined benefit obligation 29 years 7 months 2 days    
Actuarial loss expected to be recognized in net pension cost, remainder of 2019 $ 1,000,000.0    
Fixed income securities | Pooled separate accounts      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Target plan asset allocations 50.00%    
Fixed income securities | Common collective trusts funds      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Target plan asset allocations 30.00%    
Equity securities | Pooled separate accounts      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Target plan asset allocations 50.00%    
Equity securities | Common collective trusts funds      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Target plan asset allocations 70.00%    
Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Expected contributions, remainder of 2019 (less than for other postretirement plans) $ 6,500,000    
Maximum | Other Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Impact of 0.25% change in discount rate on projected benefit obligation 1,000    
Expected contributions, remainder of 2019 (less than for other postretirement plans) $ 100,000