GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Cost	$ 1,109,451	$ 1,091,217
Accumulated Amortization	(635,003)	(597,951)
Net	474,448	493,266
Developed technology
Finite-Lived Intangible Assets [Line Items]
Cost	251,995	252,071
Accumulated Amortization	(219,320)	(212,688)
Net	32,675	39,383
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Cost	775,625	775,898
Accumulated Amortization	(360,357)	(333,903)
Net	415,268	441,995
Distributor relationships and technology licenses
Finite-Lived Intangible Assets [Line Items]
Cost	11,465	11,469
Accumulated Amortization	(8,405)	(7,829)
Net	3,060	3,640
Definite-lived trademark and trade name
Finite-Lived Intangible Assets [Line Items]
Cost	58,021	39,434
Accumulated Amortization	(34,825)	(31,467)
Net	23,196	7,967
Core technology
Finite-Lived Intangible Assets [Line Items]
Cost	7,192	7,192
Accumulated Amortization	(7,192)	(7,192)
Net	0	0
Net beneficial leases
Finite-Lived Intangible Assets [Line Items]
Cost	336	336
Accumulated Amortization	(336)	(336)
Net	0	0
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Cost	292	292
Accumulated Amortization	(292)	(292)
Net	0	0
Capitalized software
Finite-Lived Intangible Assets [Line Items]
Cost	3,317	3,317
Accumulated Amortization	(3,303)	(3,281)
Net	14	36
Other
Finite-Lived Intangible Assets [Line Items]
Cost	1,208	1,208
Accumulated Amortization	(973)	(963)
Net	$ 235	$ 245