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ACQUISITION, GOODWILL, AND ACQUIRED INTANGIBLE ASSETS - Narrative (Details) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended
Jul. 02, 2018
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Business Acquisition [Line Items]        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   4 years 8 months 12 days    
Goodwill   $ 1,279,897   $ 1,278,380
Triangle [Member]        
Business Acquisition [Line Items]        
Ownership percentage 16.00%      
Polycom [Member]        
Business Acquisition [Line Items]        
Amortization of Intangible Assets   $ 45,300    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   4 years 8 months 1 day    
Goodwill $ 1,264,417      
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      
Payments to Acquire Businesses, Gross $ 1,700,000      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Tax And Tax Liabilities   $ 45,200    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Working Capital Adjustment   8,000    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other   1,400    
Goodwill, Period Increase (Decrease)   54,600    
Deferred Revenue Adjustment [Member] | Polycom [Member]        
Business Acquisition [Line Items]        
Goodwill, Purchase Accounting Adjustments   (12,200)    
Revenues     $ (36,600)  
Acquisition-related Costs [Member] | Polycom [Member]        
Business Acquisition [Line Items]        
Goodwill, Purchase Accounting Adjustments   $ (20,400)    
Revenues     19,600  
Fair Value Adjustment to Inventory [Member] | Polycom [Member]        
Business Acquisition [Line Items]        
Revenues     $ 30,400