GOODWILL & INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Cost	$ 1,090,656	$ 1,192,226
Accumulated Amortization	(440,138)	(379,452)
Net	650,518	812,774
Developed technology
Finite-Lived Intangible Assets [Line Items]
Cost	242,259	259,758
Accumulated Amortization	(168,289)	(148,937)
Net	73,970	110,821
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Cost	772,969	845,490
Accumulated Amortization	(218,043)	(176,425)
Net	554,926	669,065
Distributor relationships and technology licenses
Finite-Lived Intangible Assets [Line Items]
Cost	6,882	9,019
Accumulated Amortization	(5,237)	(5,389)
Net	1,645	3,630
Definite-lived trademark and trade name
Finite-Lived Intangible Assets [Line Items]
Cost	39,304	44,387
Accumulated Amortization	(20,586)	(18,138)
Net	18,718	26,249
Core technology
Finite-Lived Intangible Assets [Line Items]
Cost	7,192	7,345
Accumulated Amortization	(6,845)	(6,712)
Net	347	633
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	317
Accumulated Amortization	(292)	(317)
Net	0	0
Leasehold interest
Finite-Lived Intangible Assets [Line Items]
Cost	500	2,600
Accumulated Amortization	(500)	(2,130)
Net	0	470
Backlog
Finite-Lived Intangible Assets [Line Items]
Cost	16,397	18,544
Accumulated Amortization	(16,397)	(18,544)
Net	0	0
Capitalized software
Finite-Lived Intangible Assets [Line Items]
Cost	3,317	3,183
Accumulated Amortization	(2,690)	(1,621)
Net	627	1,562
Other
Finite-Lived Intangible Assets [Line Items]
Cost	1,208	1,247
Accumulated Amortization	(923)	(903)
Net	$ 285	$ 344