RESTRUCTURING CHARGES - Additional Information (Details) $ in Millions		3 Months Ended		12 Months Ended
		Sep. 28, 2018 USD ($)	Jun. 29, 2018 USD ($)	Dec. 28, 2018 USD ($)	Jan. 03, 2020 USD ($)	Dec. 29, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charge				$ 10.1
Restructuring Reserve				6.9	$ 1.9	$ 0.0
Q2 2018 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Number of Positions Eliminated			260
Restructuring Reserve	[1]			1.9
Q2 2018 Restructuring Plan [Member] | Operating Expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charge				$ 10.1
Q2 2018 Restructuring Plan [Member] | Network and Security Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charge			$ 2.1
Q2 2018 Restructuring Plan [Member] | Electrical and Electronic Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charge			1.3
Q2 2018 Restructuring Plan [Member] | Utility Power Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charge			1.1
Q2 2018 Restructuring Plan [Member] | Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charge		$ 0.2	$ 5.4

[1] Employee-related costs primarily consist of severance benefits provided to employees who have been involuntarily terminated.