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STOCK-BASED COMPENSATION: - Effect of stock-based compensation expense on income, by financial statement line item (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Share-based compensation    
Total non-cash stock-based compensation $ 16.5 $ 18.6
Cost of revenue    
Share-based compensation    
Total non-cash stock-based compensation 0.8 0.8
Research and development    
Share-based compensation    
Total non-cash stock-based compensation 5.9 4.0
Sales and marketing    
Share-based compensation    
Total non-cash stock-based compensation 7.1 8.9
General and administrative    
Share-based compensation    
Total non-cash stock-based compensation $ 2.7 $ 4.9