PENSION AND OTHER POSTRETIREMENT BENEFITS - Schedule of Economic Assumptions and Impact of Change in Discount Rate on Benefit Obligation (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Dec. 30, 2018
Assumptions used to measure net pension and other postretirement cost:
Increase in Discount Rate of 0.25% - Impact on defined benefit obligation for pension benefits	$ (4,122)
Decrease in Discount Rate of 0.25% - Impact on defined benefit obligation for pension benefits	$ 4,329
Pension Benefits
Assumptions used to measure benefit obligation at end of period:
Discount rate	3.60%		4.40%
Assumptions used to measure net pension and other postretirement cost:
Discount rate	4.40%	3.69%
Expected return on plan assets	5.50%	5.50%
Other Benefits
Assumptions used to measure benefit obligation at end of period:
Discount rate	3.15%		4.07%
Assumptions used to measure net pension and other postretirement cost:
Discount rate	4.07%	3.39%