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ACQUISITION, GOODWILL, AND ACQUIRED INTANGIBLE ASSETS - Narrative (Details) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Jul. 02, 2018
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2018
Mar. 31, 2018
Business Acquisition [Line Items]          
Goodwill   $ 1,272,619 $ 1,272,619 $ 1,272,619 $ 15,498
Triangle [Member]          
Business Acquisition [Line Items]          
Ownership percentage 16.00%        
Polycom [Member]          
Business Acquisition [Line Items]          
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual     513,563    
Amortization of Intangible Assets       $ 113,790  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life       17 years 11 months 14 days  
Goodwill $ 1,257,121        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred   8,000      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill   $ 46,400      
Business Combination, Consideration Transferred $ 2,200,000        
Business Combination, Consideration Transferred, Equity Interests Issued And Issuable, Shares 6.4        
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned $ 500,000        
Business Combination, Acquisition Related Costs 22,300        
Payments to Acquire Businesses, Gross 1,700,000        
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual     $ (127,863)    
Deferred Revenue Adjustment [Member] | Polycom [Member]          
Business Acquisition [Line Items]          
Revenues 28,900        
Fair Value Adjustment to Inventory [Member] | Polycom [Member]          
Business Acquisition [Line Items]          
Revenues 30,400        
Acquisition-related Costs [Member] | Polycom [Member]          
Business Acquisition [Line Items]          
Revenues $ 4,100