RESTRUCTURING (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		33 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Dec. 28, 2019	Mar. 28, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring and turnaround costs	$ 4,000	$ 2,027
Restructuring liability	2,539			$ 2,648
Restructuring liability payable in next twelve months	2,100
Turnaround costs	2,935	1,058
2020 Program
Restructuring Cost and Reserve [Line Items]
Restructuring and turnaround costs	3,500
Cumulative costs to date	15,400
Restructuring liability	1,761			$ 1,136
2020 Program | Minimum
Restructuring Cost and Reserve [Line Items]
Expected cost	60,000
2020 Program | Maximum
Restructuring Cost and Reserve [Line Items]
Expected cost	70,000
2018 Program
Restructuring Cost and Reserve [Line Items]
Restructuring and turnaround costs	$ 500	$ 2,000	$ 58,700