GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Cost	$ 1,192,226	$ 1,170,562
Accumulated Amortization	(379,452)	(257,893)
Net	812,774	912,669
Developed technology
Finite-Lived Intangible Assets [Line Items]
Cost	259,758	254,005
Accumulated Amortization	(148,937)	(110,200)
Net	110,821	143,805
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Cost	845,490	831,731
Accumulated Amortization	(176,425)	(105,319)
Net	669,065	726,412
Distributor relationships and technology licenses
Finite-Lived Intangible Assets [Line Items]
Cost	9,019	8,290
Accumulated Amortization	(5,389)	(3,068)
Net	3,630	5,222
Definite-lived trademark and trade name
Finite-Lived Intangible Assets [Line Items]
Cost	44,387	43,817
Accumulated Amortization	(18,138)	(12,078)
Net	26,249	31,739
Core technology
Finite-Lived Intangible Assets [Line Items]
Cost	7,345	7,108
Accumulated Amortization	(6,712)	(6,009)
Net	633	1,099
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	317	278
Accumulated Amortization	(317)	(278)
Net	0	0
Leasehold interest
Finite-Lived Intangible Assets [Line Items]
Cost	2,600	2,600
Accumulated Amortization	(2,130)	(998)
Net	470	1,602
Backlog
Finite-Lived Intangible Assets [Line Items]
Cost	18,544	18,142
Accumulated Amortization	(18,544)	(18,133)
Net	0	9
Capitalized software
Finite-Lived Intangible Assets [Line Items]
Cost	3,183	3,047
Accumulated Amortization	(1,621)	(594)
Net	1,562	2,453
Other
Finite-Lived Intangible Assets [Line Items]
Cost	1,247	1,208
Accumulated Amortization	(903)	(880)
Net	$ 344	$ 328