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EMPLOYEE BENEFIT PLANS - Weighted-average Assumptions (Details) - Pension Plans
12 Months Ended
Dec. 31, 2016
Dec. 26, 2015
Dec. 27, 2014
Weighted-average assumptions used to determine projected benefit obligations      
Discount rate 3.01% 3.89%  
Rate of compensation increase 3.25% 3.17%  
Weighted-average assumptions used to determine net periodic benefit cost      
Discount rate 3.89% 3.75% 4.44%
Expected long-term return on plan assets 5.83% 6.24% 6.41%
Rate of compensation increase 3.17% 3.18% 3.36%