DEFINED BENEFIT PLANS - Periodic Benefits Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Jul. 29, 2018	Sep. 28, 2019	Jul. 29, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 17	$ 29	$ 49	$ 86
Interest cost	1,040	556	3,119	1,666
Expected return on assets	(1,234)	(729)	(3,701)	(2,187)
Amortization of prior service cost	15	15	43	43
Amortization of net actuarial loss	704	248	2,112	743
Net periodic benefit cost	542	119	1,622	351
Defined Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	11	22	32	65
Interest cost	974	494	2,922	1,481
Expected return on assets	(1,234)	(729)	(3,701)	(2,187)
Amortization of prior service cost	15	15	43	43
Amortization of net actuarial loss	704	248	2,112	743
Net periodic benefit cost	470	50	1,408	145
OPEB Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	7	17	21
Interest cost	66	62	197	185
Expected return on assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Amortization of net actuarial loss	0	0	0	0
Net periodic benefit cost	$ 72	$ 69	$ 214	$ 206