ACQUISITION, GOODWILL, AND ACQUIRED INTANGIBLE ASSETS ACQUISITION, GOODWILL, AND ACQUIRED INTANGIBLE ASSETS - Acquired Intangible Assets (Details) - USD ($) $ in Thousands		6 Months Ended
	Jul. 02, 2018	Sep. 30, 2019
Polycom [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 927,400
Weighted Average Remaining Useful Life		5 years 5 months 12 days
Intangible Assets Acquired	985,400
Existing technology
Business Acquisition [Line Items]
Weighted Average Remaining Useful Life		3 years 9 months 18 days
Existing technology | Polycom [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	538,600
Weighted Average Remaining Useful Life		4 years 11 months 12 days
Customer relationships
Business Acquisition [Line Items]
Weighted Average Remaining Useful Life		4 years 3 months 18 days
Customer relationships | Polycom [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	245,100
Weighted Average Remaining Useful Life		5 years 5 months 15 days
Order or Production Backlog [Member] | Polycom [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	28,100
Weighted Average Remaining Useful Life		7 days
Trademarks and Trade Names [Member]
Business Acquisition [Line Items]
Weighted Average Remaining Useful Life		7 years 9 months 18 days
Trademarks and Trade Names [Member] | Polycom [Member]
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	115,600
Weighted Average Remaining Useful Life		9 years
In-process R&D | Polycom [Member]
Business Acquisition [Line Items]
Indefinite-lived Intangible Assets Acquired	$ 58,000