SEGMENT AND ENTERPRISE-WIDE INFORMATION (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 28, 2019 USD ($)	Sep. 29, 2018 USD ($)	Sep. 28, 2019 USD ($) segment	Sep. 29, 2018 USD ($)
Segment Reporting [Abstract]
Number of business units | segment			3
Segment Reporting Information [Line Items]
Net revenues before foreign exchange impact	$ 249,710	$ 237,794	$ 485,656	$ 462,747
Effect of exchange rates	(2,420)	(950)	(4,781)	(881)
Net revenues	252,566	241,581	491,017	470,928
Effect of exchange rates	2,501	2,594	5,270	5,649
Impairment of assets and related costs	(54)	0	(51,220)	(21,170)
Amortization	5,935	6,236	11,909	12,536
PCS2 accelerated depreciation and related costs	(6,534)	(4,442)	(12,062)	(8,381)
Gain on sale of assets	8,083	0	8,083	0
Restructuring and turnaround costs	(3,757)	(2,118)	(5,784)	(5,467)
Other	180	0	147	(675)
Operating (loss) income	49,739	26,076	36,437	31,369
United States
Segment Reporting Information [Line Items]
Net revenues	161,880	152,926	318,255	295,066
Japan
Segment Reporting Information [Line Items]
Net revenues	20,376	17,172	35,843	34,561
Europe
Segment Reporting Information [Line Items]
Net revenues	38,074	39,096	74,827	78,098
Asia
Segment Reporting Information [Line Items]
Net revenues	30,192	30,575	58,833	59,970
Other
Segment Reporting Information [Line Items]
Net revenues	2,044	1,812	3,259	3,233
Service
Segment Reporting Information [Line Items]
Net revenues before foreign exchange impact	5,276	4,737	10,142	9,062
Plasma products and services
Segment Reporting Information [Line Items]
Net revenues	135,849	124,352	265,594	241,255
Blood Center products and services
Segment Reporting Information [Line Items]
Net revenues	65,615	68,243	125,522	132,726
Hospital products and services
Segment Reporting Information [Line Items]
Net revenues	51,102	48,986	99,901	96,947
Plasma
Segment Reporting Information [Line Items]
Net revenues before foreign exchange impact	116,381	106,850	227,144	206,140
Blood Center
Segment Reporting Information [Line Items]
Net revenues before foreign exchange impact	83,667	83,513	161,663	163,331
Hospital
Segment Reporting Information [Line Items]
Net revenues before foreign exchange impact	49,662	47,431	96,849	93,276
Operating Segments
Segment Reporting Information [Line Items]
Operating (loss) income	118,835	105,177	229,195	203,898
Operating Segments | Plasma
Segment Reporting Information [Line Items]
Operating (loss) income	56,776	44,607	110,501	86,528
Operating Segments | Blood Center
Segment Reporting Information [Line Items]
Operating (loss) income	41,208	41,055	78,927	79,527
Operating Segments | Hospital
Segment Reporting Information [Line Items]
Operating (loss) income	20,851	19,515	39,767	37,843
Corporate
Segment Reporting Information [Line Items]
Corporate expenses	$ (63,580)	$ (68,899)	$ (125,283)	$ (129,949)