RESTRUCTURING (Schedule of Restructuring and Related Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 1,343	$ (33)	$ 2,312	$ (325)
Turnaround costs	2,414	2,151	3,472	5,792
Total restructuring and turnaround costs	3,757	2,118	5,784	5,467
Blood Center
Restructuring Cost and Reserve [Line Items]
Restructuring costs	94	77	136	45
Turnaround costs	0	0	0	0
Hospital
Restructuring Cost and Reserve [Line Items]
Restructuring costs	34	(229)	237	(223)
Turnaround costs	0	(68)	0	(139)
Plasma
Restructuring Cost and Reserve [Line Items]
Restructuring costs	395	(44)	548	(83)
Turnaround costs	31	31	79	43
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs	820	163	1,391	(64)
Turnaround costs	2,383	2,188	3,393	5,888
Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring costs	283	0	442	0
Research and development
Restructuring Cost and Reserve [Line Items]
Restructuring costs	555	34	569	56
Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 505	$ (67)	$ 1,301	$ (381)