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Share-Based Compensation - Summary of Share-Based Compensation Expense (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | $ 19,269 | $ 14,278 | $ 84,958 | $ 67,751
R&D Expenses [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | 1,615 | 1,119 | 22,637 | 7,738
G&A Expenses [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | $ 17,654 | $ 13,159 | $ 62,321 | $ 60,013

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