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EMPLOYEE BENEFIT PLANS - Reconciliation of Benefit Obligations and Plan Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 26, 2020
Dec. 28, 2019
Dec. 29, 2018
Change in projected benefit obligations:      
Benefit obligation at beginning of year $ 447,409 $ 362,805  
Service cost 3,609 2,833 $ 2,612
Interest cost 8,849 11,583 10,850
Other 429 850  
Benefit payments (8,913) (11,062)  
Settlements (101,979) (74)  
Special/Contractual Termination Benefits 0 166  
Transfer in from acquisition 0 6,818  
Actuarial loss 9,816 66,432  
Administrative expenses paid (808) (470)  
Effect of foreign exchange 9,056 7,528  
Benefit obligation at end of year 367,468 447,409 362,805
Change in fair value of plan assets:      
Fair value of plan assets at beginning of year 357,181 305,709  
Actual return on plan assets 36,551 53,741  
Employer contributions 34,092 2,105  
Settlements (101,979) (74)  
Transfer in from acquisition 0 119  
Benefit payments (8,913) (11,062)  
Administrative expenses paid (808) (470)  
Effect of foreign exchange 8,628 7,113  
Fair value of plan assets at end of year 324,752 357,181 $ 305,709
Net balance sheet liability 42,716 90,228  
Amounts recognized in balance sheet:      
Noncurrent assets 31,916 1,742  
Current liabilities 1,713 12,788  
Noncurrent liabilities $ 72,919 $ 79,182