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STOCK-BASED COMPENSATION: - Effect of stock-based compensation expense on income, by financial statement line item (Details) - USD ($) $ in Millions | 9 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Share-based compensation |  |
Total non-cash stock-based compensation | $ 64.6 | $ 72.3
Cost of revenue |  |
Share-based compensation |  |
Total non-cash stock-based compensation | 2.7 | 2.8
Research and development |  |
Share-based compensation |  |
Total non-cash stock-based compensation | 21.0 | 17.3
Sales and marketing |  |
Share-based compensation |  |
Total non-cash stock-based compensation | 25.6 | 34.4
General and administrative |  |
Share-based compensation |  |
Total non-cash stock-based compensation | $ 15.3 | $ 17.8

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