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EMPLOYEE BENEFIT PLANS - Weighted-average Assumptions (Details)
12 Months Ended
Dec. 26, 2020
Dec. 28, 2019
Dec. 29, 2018
Weighted-average assumptions used to determine projected benefit obligations      
Discount rate 1.48% 2.14%  
Rate of compensation increase 2.98% 2.99%  
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate 2.14% 3.21% 2.82%
Expected long-term return on plan assets 3.35% 4.28% 5.18%
Rate of compensation increase 2.99% 3.23% 3.16%