GOODWILL AND INTANGIBLE ASSETS Schedule of Goodwill (Details) - USD ($)	12 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Goodwill [Roll Forward]
Goodwill, carrying amount	$ 210,819,000	$ 211,395,000
Impairment charge	0	0
Currency translation	(167,000)	(576,000)
Goodwill, carrying amount	210,652,000	210,819,000
Plasma
Goodwill [Roll Forward]
Goodwill, carrying amount	28,979,000	28,979,000
Currency translation	0	0
Goodwill, carrying amount	28,979,000	28,979,000
Blood Center
Goodwill [Roll Forward]
Goodwill, carrying amount	36,666,000	36,782,000
Currency translation	(34,000)	(116,000)
Goodwill, carrying amount	36,632,000	36,666,000
North America Plasma
Goodwill [Roll Forward]
Goodwill, carrying amount	145,174,000	145,634,000
Currency translation	(133,000)	(460,000)
Goodwill, carrying amount	$ 145,041,000	$ 145,174,000