PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS - NARRATIVE (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2021 USD ($)	Jun. 28, 2020 USD ($)	Jul. 04, 2021 USD ($)	Jun. 28, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Remeasurement, Basis Spread on Discount Rate (Basis Points)			0.0034
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets			4.80%
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 325	$ 248	$ 1,183	$ 1,005
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 4,000	$ 3,976	$ 8,155	$ 7,328