GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Cost	$ 1,186,471	$ 1,170,562
Accumulated Amortization	(345,911)	(257,893)
Net	840,560	912,669
Developed technology
Finite-Lived Intangible Assets [Line Items]
Cost	260,586	254,005
Accumulated Amortization	(140,225)	(110,200)
Net	120,361	143,805
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Cost	841,403	831,731
Accumulated Amortization	(155,874)	(105,319)
Net	685,529	726,412
Distributor relationships and technology licenses
Finite-Lived Intangible Assets [Line Items]
Cost	6,949	8,290
Accumulated Amortization	(3,517)	(3,068)
Net	3,432	5,222
Definite-lived trademark and trade name
Finite-Lived Intangible Assets [Line Items]
Cost	44,210	43,817
Accumulated Amortization	(16,653)	(12,078)
Net	27,557	31,739
Core technology
Finite-Lived Intangible Assets [Line Items]
Cost	7,271	7,108
Accumulated Amortization	(6,522)	(6,009)
Net	749	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	306	278
Accumulated Amortization	(306)	(278)
Net	0	0
Leasehold interest
Finite-Lived Intangible Assets [Line Items]
Cost	2,600	2,600
Accumulated Amortization	(1,807)	(998)
Net	793	1,602
Backlog
Finite-Lived Intangible Assets [Line Items]
Cost	18,419	18,142
Accumulated Amortization	(18,417)	(18,133)
Net	2	9
Capitalized software
Finite-Lived Intangible Assets [Line Items]
Cost	3,183	3,047
Accumulated Amortization	(1,356)	(594)
Net	1,827	2,453
Other
Finite-Lived Intangible Assets [Line Items]
Cost	1,208	1,208
Accumulated Amortization	(898)	(880)
Net	$ 310	$ 328