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PENSION AND OTHER POSTRETIREMENT BENEFITS (Narrative) (Details)
12 Months Ended
Dec. 25, 2016
USD ($)
plan
Dec. 27, 2015
USD ($)
Dec. 28, 2014
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Retirement plan expenses $ 8,100,000 $ 10,500,000 $ 5,900,000
Accumulated benefit obligation, defined benefit pension plans $ 167,200,000 166,000,000  
Weighted average duration of defined benefit obligation 32 years 3 months 15 days    
Actuarial loss expected to be recognized in net pension cost throughout 2015 $ 900,000    
Maximum annual contribution per employee, percent 30.00%    
Maximum annual contribution per employee, amount $ 245,000    
Expenses related to defined contribution plans $ 5,000,000 $ 4,800,000 $ 3,900,000
Minimum [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Matching contribution, percent of employees' salary 2.00%    
Maximum [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Matching contribution, percent of employees' salary 6.00%    
Pension Benefits [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Expected contributions during 2015 $ 13,100,000    
Other Benefits [Member]      
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 during 2015 $ 100,000    
Fixed income securities [Member] | Pooled separate accounts [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Target plan asset allocations 50.00%    
Fixed income securities [Member] | Common collective trusts funds [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Target plan asset allocations 30.00%    
Equity securities [Member] | Pooled separate accounts [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Target plan asset allocations 50.00%    
Equity securities [Member] | Common collective trusts funds [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Target plan asset allocations 70.00%    
Pension Benefits [Member] | Qualified Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Defined benefit plans, number of plans | plan 2    
Pension Benefits [Member] | Nonqualified Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Defined benefit plans, number of plans | plan 2    
Postretirement Life Insurance Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Defined benefit plans, number of plans | plan 1    
Other plans [Member] | Domestic Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Defined contribution plans, number of plans | plan 2    
Other plans [Member] | Foreign Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Defined contribution plans, number of plans | plan 3