RESTRUCTURING (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		15 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring and turnaround costs	$ 3,349	$ 2,483
Restructuring liability	20,256		$ 20,256	$ 28,535
Restructuring liability payable in next twelve months	18,100		18,100
Restructuring costs	(292)	1,056
Turnaround costs	3,641	1,427
2018 Program
Restructuring Cost and Reserve [Line Items]
Restructuring and turnaround costs	3,400		40,000
Restructuring liability	19,777		19,777	27,129
Restructuring costs	(268)
2018 Program | Minimum
Restructuring Cost and Reserve [Line Items]
Expected cost				50,000
2018 Program | Minimum | Employee Severance
Restructuring Cost and Reserve [Line Items]
Expected cost				35,000
2018 Program | Maximum
Restructuring Cost and Reserve [Line Items]
Expected cost				60,000
2018 Program | Maximum | Employee Severance
Restructuring Cost and Reserve [Line Items]
Expected cost				40,000
2017 Program
Restructuring Cost and Reserve [Line Items]
Restructuring and turnaround costs		$ 2,500
Restructuring liability	479		$ 479	$ 1,406
Restructuring costs	$ (24)