RESTRUCTURING ACTIVITIES RESTRUCTURING ACTIVITIES (Details 2) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 29, 2019 USD ($) facility	Dec. 28, 2019 USD ($)
Restructuring Cost and Reserve [Roll Forward]
Beginning balance	$ 10,056	$ 10,056
Recognized Restructuring Expense		0
Costs Paid or Otherwise Settled		(10,056)
Ending balance		0
Facility Closing
Restructuring Cost and Reserve [Line Items]
Number of facilities closed | facility	7
Severance
Restructuring Cost and Reserve [Roll Forward]
Beginning balance	$ 6,594	6,594
Recognized Restructuring Expense		0
Costs Paid or Otherwise Settled		(6,594)
Ending balance		0
Other cash restructuring expenses
Restructuring Cost and Reserve [Roll Forward]
Beginning balance	$ 3,462	3,462
Recognized Restructuring Expense		0
Costs Paid or Otherwise Settled		(3,462)
Ending balance		$ 0
CHINA | Facility Closing
Restructuring Cost and Reserve [Line Items]
Number of facilities closed | facility	3
Utility | Facility Closing
Restructuring Cost and Reserve [Line Items]
Number of facilities closed | facility	1
ESS | Facility Closing
Restructuring Cost and Reserve [Line Items]
Number of facilities closed | facility	1