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EMPLOYEE BENEFITS (Details)
1 Months Ended 3 Months Ended
Mar. 22, 2019
Feb. 28, 2019
USD ($)
employee
Mar. 31, 2019
USD ($)
item
Apr. 01, 2018
USD ($)
Dec. 30, 2018
USD ($)
EMPLOYEE BENEFITS          
Matching contributions     $ 600,000 $ 700,000  
Pension plan          
EMPLOYEE BENEFITS          
Number of new participants | item     0    
Further benefits     $ 0    
Special termination benefits     6,834,000    
ERIP          
EMPLOYEE BENEFITS          
Number of employee offered with voluntary early retirement incentive Program | employee   450      
Percentage of employees opted for voluntary early retirement incentive Program   50.00%      
Lump sum pension and termination payments   $ 35,100,000      
Discount rate (as a percent) 4.10%        
Expected long-term return on plan assets (as a percent) 7.75%        
Remeasurement resulted in a net reduction to the pension liability     13,100,000    
Unfunded liability for the pension plan     $ 535,100,000   $ 548,200,000