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ACQUISITION - Narrative (Details) - USD ($)
$ in Thousands, shares in Millions
9 Months Ended 12 Months Ended
Jul. 02, 2018
Mar. 31, 2019
Mar. 31, 2019
Mar. 31, 2018
Business Acquisition [Line Items]        
Goodwill   $ 1,278,380 $ 1,278,380 $ 15,498
Triangle [Member]        
Business Acquisition [Line Items]        
Ownership percentage 16.00%      
Polycom [Member]        
Business Acquisition [Line Items]        
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Tax And Tax Liabilities     44,000  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Working Capital Adjustment     8,000  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other     4,200  
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual   765,144    
Goodwill $ 1,262,883      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill     $ 56,200  
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, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual   $ (129,032)    
Deferred Revenue Adjustment [Member] | Polycom [Member]        
Business Acquisition [Line Items]        
Revenues 84,800      
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 $ 19,200