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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
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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

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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