SEGMENT AND ENTERPRISE-WIDE INFORMATION (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 29, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 29, 2018 USD ($) unit	Sep. 30, 2017 USD ($)
Segment Reporting [Abstract]
Number of business units | unit			3
Segment Reporting Information [Line Items]
Net revenues before foreign exchange impact	$ 242,531	$ 226,194	$ 471,809	$ 440,144
Effect of exchange rates	(950)	(817)	(881)	(3,816)
Net revenues	241,581	225,377	470,928	436,328
Effect of exchange rates	2,594	1,102	5,649	(1,099)
Restructuring and turnaround costs	(2,118)	(5,787)	(5,467)	(8,270)
Deal amortization	(6,236)	(6,504)	(12,536)	(12,995)
Asset impairments	0	0	(21,170)	0
Accelerated depreciation	0	0	(8,381)	0
Legal charges	(4,442)	0	(675)	0
Operating income	26,076	24,258	31,369	40,869
Plasma
Segment Reporting Information [Line Items]
Net revenues	124,352	109,771	241,255	211,278
Blood Center
Segment Reporting Information [Line Items]
Net revenues	68,243	71,710	132,726	137,275
Hospital
Segment Reporting Information [Line Items]
Net revenues	48,986	43,896	96,947	87,775
United States
Segment Reporting Information [Line Items]
Net revenues	152,926	138,779	295,066	269,831
Japan
Segment Reporting Information [Line Items]
Net revenues	17,172	16,732	34,561	31,648
Europe
Segment Reporting Information [Line Items]
Net revenues	39,096	39,133	78,098	76,355
Asia
Segment Reporting Information [Line Items]
Net revenues	30,575	28,831	59,970	54,771
Other
Segment Reporting Information [Line Items]
Net revenues	1,812	1,902	3,233	3,723
Japan
Segment Reporting Information [Line Items]
Net revenues before foreign exchange impact	17,343	17,164	33,947	32,396
EMEA
Segment Reporting Information [Line Items]
Net revenues before foreign exchange impact	40,051	41,428	81,339	81,867
North America Plasma
Segment Reporting Information [Line Items]
Net revenues before foreign exchange impact	99,655	85,051	191,229	162,587
All Other
Segment Reporting Information [Line Items]
Net revenues before foreign exchange impact	85,482	82,551	165,294	163,294
Operating Segments
Segment Reporting Information [Line Items]
Operating income	98,522	85,903	190,466	161,738
Operating Segments | Japan
Segment Reporting Information [Line Items]
Operating income	9,366	8,656	17,633	16,123
Operating Segments | EMEA
Segment Reporting Information [Line Items]
Operating income	11,459	10,026	23,499	20,524
Operating Segments | North America Plasma
Segment Reporting Information [Line Items]
Operating income	41,468	34,692	80,064	61,892
Operating Segments | All Other
Segment Reporting Information [Line Items]
Operating income	36,229	32,529	69,270	63,199
Corporate operating expenses
Segment Reporting Information [Line Items]
Corporate operating expenses	$ (62,244)	$ (50,456)	$ (116,517)	$ (98,505)