GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2016 Segment	Dec. 31, 2016 USD ($) Segment	Mar. 31, 2016 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Number of reporting units | Segment	5	2
Goodwill impairment test, sensitivity analysis, decrease of projected revenue growth		2.00%
Goodwill impairment test, sensitivity analysis, decrease of selling margin		4.00%
Goodwill impairment test, sensitivity analysis, decrease of operating margin		5.00%
Goodwill impairment test, sensitivity analysis, increase of WACC		2.00%
Goodwill		$ 1,720,911	$ 1,709,369
Carrying value of intangible assets		$ 959,042	1,054,040
Weighted average useful life of acquired intangible assets		14 years 7 months
Developed and core technology
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life of acquired intangible assets		11 years 6 months
Customer and distributor relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life of acquired intangible assets		16 years 1 month
Trademarks and trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life of acquired intangible assets		8 years 6 months
Leasehold interest
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life of acquired intangible assets		5 years 7 months 6 days
Backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life of acquired intangible assets		2 years
Capitalized software
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful life of acquired intangible assets		4 years
Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets		$ 18,600	18,600
Service Assurance
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill		1,200,000	1,200,000
Security
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 548,100	$ 547,400