EMPLOYEE BENEFITS - Retirement and Post retirement costs - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018
Retirement expense for continuing operations
Net pension expense	$ 23,715	$ 11,114
Pension plan
Retirement expense for continuing operations
Interest cost	79,309	79,154
Expected return on plan assets	(83,820)	(90,495)
Prior service cost amortization	6,834
Actuarial loss	23,995	25,181
Net pension expense	26,318	13,840
Post-retirement plans
Retirement expense for continuing operations
Interest cost	262	256
Net pension expense	$ (2,603)	$ (2,726)