ACQUISITION, GOODWILL AND ACQUIRED INTANGIBLE ASSETS - Pro Forma Information (Details) - Polycom [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue	$ 523,662	$ 498,744	$ 1,526,182	$ 1,419,151
Business Acquisition, Pro Forma Operating Income (Loss)	14,132	(69,472)	16,597	(186,721)
Business Acquisition, Pro Forma Net Income (Loss)	$ (9,273)	$ (211,180)	$ (39,485)	$ (327,693)