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Income Taxes - Schedule of Loss Before Income Taxes by Geographic Region (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Loss before income taxes: |  |  |
Total loss before income taxes |  | $ (898,547) | $ (560,986)
United States [Member] |  |  |
Loss before income taxes: |  |  |
Total loss before income taxes |  | (212,921) | (69,264)
Switzerland [Member] |  |  |
Loss before income taxes: |  |  |
Total loss before income taxes |  | (424,494) | (355,422)
Bermuda [Member] |  |  |
Loss before income taxes: |  |  |
Total loss before income taxes |  | (227,471) | (105,604)
Other [Member] |  |  |
Loss before income taxes: |  |  |
Total loss before income taxes | [1] | $ (33,661) | $ (30,696)
[1] | Primarily Greater China and United Kingdom activity

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