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EMPLOYEE BENEFIT PLANS - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 26, 2020
Dec. 26, 2020
Dec. 28, 2019
Dec. 29, 2018
Defined Benefit Plan Disclosure [Line Items]        
Benefit obligations $ 367,468 $ 367,468 $ 447,409 $ 362,805
Plan assets 324,752 324,752 357,181 305,709
Employer contributions to participants within plan assets   34,092 2,105  
Net periodic benefit cost (income)   $ 7,277 4,022 1,332
Deferral period   3 years    
Maximum annual contributions per employee, percent   10.00%    
Period of highest consecutive years of compensation   5 years    
Costs associated with deferred compensation plan and executive supplemental life insurance retirement plans   $ 5,700 2,500 2,900
Cash surrender value of life insurance policies 43,827 43,827 38,207  
Change in projected benefit obligation based on sensitivity 17,000 $ 17,000    
Sensitivity of expected rate of return on plan assets, percent change   0.50%    
Sensitivity of change in expected rate of return, annual pension expense amount   $ 1,600    
Decrease in benefit obligations from new morality improvement scales   7,800 2,800  
Expected employer contributions in next fiscal year 900 900    
Accumulated benefit obligation 1,300 1,300 1,100  
Costs associated with employee savings plan   14,600 19,100 13,400
U.K. Plan        
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions to participants within plan assets   23,000    
U.K. Plan | Defined Benefit Plan, Funding Status        
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions to participants within plan assets   28,900    
Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Benefit obligations 93,800 93,800    
Plan assets 93,000 93,000    
Employer contributions to participants within plan assets 800 24,600    
Non-cash settlement charge related to pension losses, reclassified from AOCI to other expense   10,300    
Net periodic benefit cost (income)   1,600 1,500 $ (1,500)
Employer contributions to participants outside of plan assets   9,500    
Equity Securities        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets $ 63,465 $ 63,465 91,998  
Target asset allocation percentage 22.10% 22.10%    
Fixed Income Securities        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets $ 99,188 $ 99,188 129,965  
Target asset allocation percentage 15.30% 15.30%    
Other Securities        
Defined Benefit Plan Disclosure [Line Items]        
Plan assets $ 68,263 $ 68,263 $ 56,852  
Target asset allocation percentage 62.60% 62.60%    
Executive Officer        
Defined Benefit Plan Disclosure [Line Items]        
Costs associated with deferred compensation plan and executive supplemental life insurance retirement plans   $ 8,100    
Settlement charges related to pension losses   $ 2,100