RESTRUCTURING (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended		21 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 29, 2018	Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring and turnaround costs	$ 1,754,000	$ 31,298,000	$ 7,221,000	$ 39,568,000
Restructuring liability	9,140,000		9,140,000		$ 9,140,000	$ 28,535,000
Restructuring liability payable in next twelve months	8,600,000		8,600,000		8,600,000
Restructuring costs	(694,000)	28,455,000	(1,019,000)	29,662,000
Turnaround costs	2,448,000	2,843,000	8,240,000	9,906,000
2018 Program
Restructuring Cost and Reserve [Line Items]
Restructuring and turnaround costs	1,900,000		7,300,000		43,800,000
Restructuring liability	8,781,000		8,781,000		8,781,000	27,129,000
Restructuring costs			(957,000)
2018 Program | Minimum
Restructuring Cost and Reserve [Line Items]
Expected cost						50,000,000
2018 Program | Minimum | Employee Severance
Restructuring Cost and Reserve [Line Items]
Expected cost						35,000,000
2018 Program | Maximum
Restructuring Cost and Reserve [Line Items]
Expected cost						60,000,000
2018 Program | Maximum | Employee Severance
Restructuring Cost and Reserve [Line Items]
Expected cost						40,000,000
2017 Program
Restructuring Cost and Reserve [Line Items]
Restructuring and turnaround costs		$ 0		$ 7,700,000
Restructuring liability	$ 359,000		359,000		$ 359,000	$ 1,406,000
Restructuring costs			$ (62,000)