GOODWILL AND PURCHASED INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands		12 Months Ended
	Jul. 02, 2018	Mar. 31, 2019	Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets		$ 132,179
Intangible assets, net		825,675	$ 0
Finite-Lived Intangible Assets, Net		$ 795,326
Finite-Lived Intangible Assets, Remaining Amortization Period		4 years 10 months 19 days
Goodwill		$ 1,278,380	$ 15,498
Finite-lived Intangible Assets Acquired		957,854
Technology-Based Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets		86,301
Finite-Lived Intangible Assets, Net		$ 480,580
Finite-Lived Intangible Assets, Remaining Amortization Period		4 years 2 months 12 days
Finite-lived Intangible Assets Acquired		$ 566,881
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets		36,245
Finite-Lived Intangible Assets, Net		$ 209,236
Finite-Lived Intangible Assets, Remaining Amortization Period		4 years 9 months 9 days
Finite-lived Intangible Assets Acquired		$ 245,481
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets		9,633
Finite-Lived Intangible Assets, Net		$ 105,967
Finite-Lived Intangible Assets, Remaining Amortization Period		8 years 3 months
Finite-lived Intangible Assets Acquired		$ 115,600
In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets (Excluding Goodwill)		29,892
Polycom [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period	5 years 5 months 12 days
Goodwill	$ 1,262,883
Amortization of Intangible Assets		160,300
Finite-lived Intangible Assets Acquired	$ 927,400
Polycom [Member] | Technology-Based Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period	4 years 11 months 12 days
Finite-lived Intangible Assets Acquired		538,600
Polycom [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period	5 years 5 months 16 days
Finite-lived Intangible Assets Acquired		245,100
Polycom [Member] | Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Remaining Amortization Period	9 years
Finite-lived Intangible Assets Acquired		115,600
Polycom [Member] | In Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets (Excluding Goodwill)		$ 58,000