ACQUISITIONS - Schedule of Fair value of Acquired Identifiable Intangible Assets and Related Estimates of Useful Lives (Details) - Communications Business $ in Thousands	6 Months Ended
	Sep. 30, 2015 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value of finite-lived intangible assets	$ 1,080,700
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value of finite-lived intangible assets	$ 221,900
Developed technology | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life of identifiable finite-lived intangible assets	9 years
Developed technology | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life of identifiable finite-lived intangible assets	13 years
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value of finite-lived intangible assets	$ 794,100
Customer relationships | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life of identifiable finite-lived intangible assets	13 years
Customer relationships | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life of identifiable finite-lived intangible assets	18 years
Backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value of finite-lived intangible assets	$ 18,200
Backlog | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life of identifiable finite-lived intangible assets	1 year
Backlog | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life of identifiable finite-lived intangible assets	3 years
Definite lived trademark and trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value of finite-lived intangible assets	$ 43,900
Definite lived trademark and trade name | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life of identifiable finite-lived intangible assets	3 years
Definite lived trademark and trade name | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life of identifiable finite-lived intangible assets	9 years
Leasehold interest
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value of finite-lived intangible assets	$ 2,600
Leasehold interest | Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life of identifiable finite-lived intangible assets	4 years
Leasehold interest | Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life of identifiable finite-lived intangible assets	6 years