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STOCK-BASED COMPENSATION AND STOCKHOLDERS' EQUITY - Stock-Based Compensation Expense By Statement Of Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based employee compensation expense | $ 107,638 | $ 70,878 | $ 44,508
Research and development |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based employee compensation expense | 31,641 | 19,712 | 12,313
Sales and marketing |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based employee compensation expense | 33,869 | 20,205 | 11,951
General and administrative |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based employee compensation expense | 28,933 | 22,580 | 14,717
Service | Cost of Sales |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based employee compensation expense | 8,811 | 5,330 | 3,752
Other revenue | Cost of Sales |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based employee compensation expense | $ 4,384 | $ 3,051 | $ 1,775

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