DEFINED BENEFIT PLANS - Periodic Benefits Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Apr. 29, 2018	Jun. 29, 2019	Apr. 29, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 17	$ 29	$ 32	$ 58
Interest cost	1,040	556	2,080	1,112
Expected return on assets	(1,234)	(729)	(2,468)	(1,458)
Amortization of prior service cost	15	15	28	28
Amortization of net actuarial loss	704	248	1,409	496
Net periodic benefit cost	542	119	1,081	236
Defined Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	11	22	21	44
Interest cost	974	494	1,949	988
Expected return on assets	(1,234)	(729)	(2,468)	(1,458)
Amortization of prior service cost	15	15	28	28
Amortization of net actuarial loss	704	248	1,409	496
Net periodic benefit cost	470	50	939	98
OPEB Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	7	11	14
Interest cost	66	62	131	124
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	$ 142	$ 138