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STOCK-BASED COMPENSATION: - Effect of stock-based compensation expense on income, by financial statement line item (Details) - USD ($) $ in Millions | 6 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Share-based compensation |  |
Total non-cash stock-based compensation | $ 40.7 | $ 42.0
Cost of revenue |  |
Share-based compensation |  |
Total non-cash stock-based compensation | 1.7 | 1.8
Research and development |  |
Share-based compensation |  |
Total non-cash stock-based compensation | 13.6 | 10.0
Sales and marketing |  |
Share-based compensation |  |
Total non-cash stock-based compensation | 16.4 | 18.7
General and administrative |  |
Share-based compensation |  |
Total non-cash stock-based compensation | $ 9.0 | $ 11.5

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