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EMPLOYEE BENEFIT PLANS - Reconciliation of Benefit Obligations and Plan Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Change in projected benefit obligations:      
Benefit obligation at beginning of year $ 379,942 $ 345,220  
Service cost 3,110 2,453 $ 4,293
Interest cost 11,642 12,046 12,974
Benefit payments (9,665) (13,383)  
Curtailment 0 (279)  
Settlements 0 (5,499)  
Plan amendments (1) 188  
Transfer in from acquisition 0 5,271  
Actuarial loss (gain) (15,724) 71,006  
Administrative expenses paid (698) (605)  
Effect of foreign exchange 24,358 (36,476)  
Benefit obligation at end of year 392,964 379,942 345,220
Change in fair value of plan assets:      
Fair value of plan assets at beginning of year 256,903 275,480  
Actual return on plan assets 33,558 23,388  
Employer contributions 5,165 10,551  
Settlements 0 (5,499)  
Transfer in from acquisition 0 508  
Benefit payments (9,665) (13,383)  
Administrative expenses paid (698) (605)  
Effect of foreign exchange 19,062 (33,537)  
Fair value of plan assets at end of year 304,325 256,903 $ 275,480
Net balance sheet liability 88,639 123,039  
Amounts recognized in balance sheet:      
Noncurrent assets 1,169 0  
Current liabilities 1,228 1,120  
Noncurrent liabilities $ 88,580 $ 121,919