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STOCKHOLDERS' EQUITY - Stock-Based Compensation Expense By Statement Of Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based employee compensation expense | $ 70,878 | $ 44,508 | $ 29,176
Research and Development Expense |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based employee compensation expense | 19,712 | 12,313 | 6,625
Selling and Marketing Expense |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based employee compensation expense | 20,205 | 11,951 | 6,630
General and Administrative Expense |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based employee compensation expense | 22,580 | 14,717 | 11,944
Service | Cost of Sales |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based employee compensation expense | 5,330 | 3,752 | 2,636
Other revenue | Cost of Sales |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based employee compensation expense | $ 3,051 | $ 1,775 | $ 1,341

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