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REVENUE AND MAJOR CUSTOMERS (Details)
3 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
Customer
Jun. 30, 2018
USD ($)
Mar. 31, 2019
USD ($)
Customer
Revenue from External Customer [Line Items]      
Contract with Customer, Asset, Gross, Current     $ 2,400,000
Revenue, Remaining Performance Obligation, Current $ 143,700    
Net revenues $ 447,767,000 $ 221,309,000  
Revenue From Contracts With Customers, Percentage Associated With Non-cancellable Maintenance And Support Contracts 90.00%    
Contract with Customer, Liability $ 196,000,000.0   193,900,000
Capitalized Contract Cost, Gross     $ 3,100,000
Revenue, Remaining Performance Obligation, Noncurrent 56,600    
Revenue, Remaining Performance Obligation, Amount 200,300    
Contract with Customer, Liability, Revenue Recognized 51,200,000    
US [Member]      
Revenue from External Customer [Line Items]      
Net revenues 224,827,000 113,986,000  
Europe and Africa [Member]      
Revenue from External Customer [Line Items]      
Net revenues 116,979,000 63,590,000  
Asia Pacific [Member]      
Revenue from External Customer [Line Items]      
Net revenues 74,848,000 26,871,000  
Americas, excluding U.S. [Member]      
Revenue from External Customer [Line Items]      
Net revenues 31,113,000 16,862,000  
Total international net revenues [Member]      
Revenue from External Customer [Line Items]      
Net revenues 222,940,000 107,323,000  
Enterprise Headset [Member]      
Revenue from External Customer [Line Items]      
Net revenues 175,084,000 167,642,000  
Consumer Headset [Member]      
Revenue from External Customer [Line Items]      
Net revenues 43,566,000 53,667,000  
Voice [Member]      
Revenue from External Customer [Line Items]      
Net revenues 103,847,000 0  
Video [Member]      
Revenue from External Customer [Line Items]      
Net revenues 60,248,000 0  
Service [Member]      
Revenue from External Customer [Line Items]      
Net revenues $ 65,022,000 $ 0  
Net Revenues [Member] | Customer Concentration Risk [Member]      
Revenue from External Customer [Line Items]      
Number of major customers, ten percent or greater, net accounts receivable | Customer 2    
Net Revenues [Member] | Customer Concentration Risk [Member] | Ingram Micro [Member]      
Revenue from External Customer [Line Items]      
Concentration risk percentage 16.90%    
Net Revenues [Member] | Customer Concentration Risk [Member] | ScanSource [Member]      
Revenue from External Customer [Line Items]      
Concentration risk percentage 17.40%    
Accounts Receivable [Member] | Customer Concentration Risk [Member]      
Revenue from External Customer [Line Items]      
Number of major customers, ten percent or greater, net accounts receivable | Customer 2   3
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Ingram Micro [Member]      
Revenue from External Customer [Line Items]      
Concentration risk percentage 29.10%   21.30%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | D&H Distributors [Member]      
Revenue from External Customer [Line Items]      
Concentration risk percentage     10.90%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | ScanSource [Member]      
Revenue from External Customer [Line Items]      
Concentration risk percentage 17.50%   19.20%
Minimum [Member]      
Revenue from External Customer [Line Items]      
Revenue From Contracts With Customers, Credit Term 30 days    
Maximum [Member]      
Revenue from External Customer [Line Items]      
Revenue From Contracts With Customers, Credit Term 90 days