GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Mar. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Cost	$ 1,113,754	$ 1,091,953
Accumulated Amortization	(597,259)	(528,374)
Net	516,495	563,579
Developed technology
Finite-Lived Intangible Assets [Line Items]
Cost	253,206	249,675
Accumulated Amortization	(208,894)	(191,876)
Net	44,312	57,799
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Cost	779,940	767,366
Accumulated Amortization	(321,257)	(275,361)
Net	458,683	492,005
Distributor relationships and technology licenses
Finite-Lived Intangible Assets [Line Items]
Cost	11,539	6,785
Accumulated Amortization	(7,608)	(6,321)
Net	3,931	464
Definite-lived trademark and trade name
Finite-Lived Intangible Assets [Line Items]
Cost	39,610	39,059
Accumulated Amortization	(30,369)	(26,246)
Net	9,241	12,813
Core technology
Finite-Lived Intangible Assets [Line Items]
Cost	7,193	7,192
Accumulated Amortization	(7,163)	(7,074)
Net	30	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	500
Accumulated Amortization	(500)	(500)
Net	0	0
Backlog
Finite-Lived Intangible Assets [Line Items]
Cost	16,613	16,223
Accumulated Amortization	(16,613)	(16,223)
Net	0	0
Capitalized software
Finite-Lived Intangible Assets [Line Items]
Cost	3,317	3,317
Accumulated Amortization	(3,270)	(3,202)
Net	47	115
Other
Finite-Lived Intangible Assets [Line Items]
Cost	1,208	1,208
Accumulated Amortization	(957)	(943)
Net	$ 251	$ 265