GOODWILL AND PURCHASED INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Mar. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 46,000	$ 70,900	$ 91,300
Accumulated Amortization	(223,439)		$ (223,439)	$ (132,179)
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			4 years 4 months 24 days
Total intangible assets	957,794		$ 957,794	957,854
Goodwill	1,279,897		1,279,897	1,278,380
Existing technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	585,867		585,867	566,881
Accumulated Amortization	(147,010)		$ (147,010)	(86,301)
Weighted Average Remaining Useful Life			3 years 9 months 18 days
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	245,437		$ 245,437	245,481
Accumulated Amortization	(60,373)		$ (60,373)	(36,245)
Weighted Average Remaining Useful Life			4 years 3 months 18 days
Trade name
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	115,600		$ 115,600	115,600
Accumulated Amortization	(16,056)		(16,056)	(9,633)
In-process R&D
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	47,100		47,100
In-process R&D
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 10,890		$ 10,890	$ 29,892

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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