RESTRUCTURING (Schedule of Restructuring and Related Costs) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Sep. 26, 2020	Jun. 27, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ (73)	$ 992	$ 1,343	$ 992	$ 2,312
Turnaround costs	4,513		2,414	7,448	3,472
Total restructuring and turnaround costs	4,440		3,757	8,440	5,784
Blood Center
Restructuring Cost and Reserve [Line Items]
Restructuring costs	20		94	174	136
Turnaround costs	490		0	506	0
Hospital
Restructuring Cost and Reserve [Line Items]
Restructuring costs	(147)		34	(18)	237
Turnaround costs	1		0	10	0
Plasma
Restructuring Cost and Reserve [Line Items]
Restructuring costs	(87)		395	481	548
Turnaround costs	804		31	804	79
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs	141		820	355	1,391
Turnaround costs	3,218		2,383	6,128	3,393
Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring costs	372		505	615	1,301
Research and development
Restructuring Cost and Reserve [Line Items]
Restructuring costs	(209)		555	110	569
Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ (236)		$ 283	$ 267	$ 442