XML 73 R60.htm IDEA: XBRL DOCUMENT v3.7.0.1
PENSION AND OTHER POSTRETIREMENT BENEFITS (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 25, 2017
Jun. 26, 2016
Jun. 25, 2017
Jun. 26, 2016
Dec. 25, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]          
Retirement plan expenses $ 1,600 $ 1,400 $ 3,200 $ 3,000  
Accumulated benefit obligation, defined benefit pension plans 174,400   $ 174,400   $ 167,200
Weighted average duration of defined benefit obligation     32 years 5 months 9 days    
Actuarial gain (loss) expected to be recognized in net pension cost, remainder of 2015 (500)   $ (500)    
Pension Benefits          
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]          
Expected contributions, remainder of 2016 (less than for other postretirement plans) 6,100   6,100    
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    
Expected contributions, remainder of 2016 (less than for other postretirement plans) $ 100   $ 100    
Fixed income securities | Pooled separate accounts          
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]          
Target plan asset allocations 50.00%   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%   30.00%    
Equity securities | Common collective trusts funds          
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]          
Target plan asset allocations 70.00%   70.00%