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COMPENSATION (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Total stock-based compensation $ 11,719 $ 8,029 $ 30,709 $ 26,047  
Income tax benefit (1,624) 2,039 (7,605) (5,650)  
Total stock-based compensation, net of tax 10,095 10,068 23,104 20,397  
Employee compensation and benefits 105,655   105,655   $ 28,655
Cost of revenues [Member]          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Total stock-based compensation 1,067 917 3,103 2,709  
Research, development, and engineering [Member]          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Total stock-based compensation 2,887 2,049 7,877 6,158  
Selling, general, and administrative [Member]          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Total stock-based compensation 7,765 5,063 19,729 17,180  
Stock-based compensation expense included in operating expenses [Member]          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Total stock-based compensation 10,652 $ 7,112 27,606 $ 23,338  
Polycom [Member]          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Employee compensation and benefits $ 7,900   $ 7,900    
Share-based Compensation Award, Tranche One [Member]          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Vesting percentage     75.00%    
Share-based Compensation Award, Tranche Two [Member]          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Vesting percentage     25.00%