GOODWILL & INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Cost	$ 1,091,217	$ 1,091,953
Accumulated Amortization	(597,951)	(528,374)
Net	493,266	563,579
Developed technology
Finite-Lived Intangible Assets [Line Items]
Cost	252,071	249,675
Accumulated Amortization	(212,688)	(191,876)
Net	39,383	57,799
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Cost	775,898	767,366
Accumulated Amortization	(333,903)	(275,361)
Net	441,995	492,005
Distributor relationships and technology licenses
Finite-Lived Intangible Assets [Line Items]
Cost	11,469	6,785
Accumulated Amortization	(7,829)	(6,321)
Net	3,640	464
Definite-lived trademark and trade name
Finite-Lived Intangible Assets [Line Items]
Cost	39,434	39,059
Accumulated Amortization	(31,467)	(26,246)
Net	7,967	12,813
Core technology
Finite-Lived Intangible Assets [Line Items]
Cost	7,192	7,192
Accumulated Amortization	(7,192)	(7,074)
Net	0	118
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
Leasehold interest
Finite-Lived Intangible Assets [Line Items]
Cost		500
Accumulated Amortization		(500)
Net		0
Backlog
Finite-Lived Intangible Assets [Line Items]
Cost		16,223
Accumulated Amortization		(16,223)
Net		0
Capitalized software
Finite-Lived Intangible Assets [Line Items]
Cost	3,317	3,317
Accumulated Amortization	(3,281)	(3,202)
Net	36	115
Other
Finite-Lived Intangible Assets [Line Items]
Cost	1,208	1,208
Accumulated Amortization	(963)	(943)
Net	$ 245	$ 265