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EMPLOYEE BENEFIT PLANS - Weighted-average Assumptions (Details)
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Weighted-average assumptions used to determine projected benefit obligations      
Discount rate 2.82% 3.01%  
Rate of compensation increase 3.16% 3.25%  
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate 3.01% 3.89% 3.75%
Expected long-term return on plan assets 5.41% 5.83% 6.24%
Rate of compensation increase 3.25% 3.17% 3.18%