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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |  |
Income tax benefit at Bermuda statutory rate |  |  |  | $ 0 | $ 0
Foreign rate differential | [1] |  |  | (150,778) | (74,922)
Permanent disallowed IPR&D |  |  |  | 111,432 |
Nondeductible changes in the fair value of investments and loss from equity method investment |  |  |  | (22,472) | 20,840
Nontaxable (loss) gain on deconsolidation of business |  |  |  | (16,438) | 29,041
Permanent adjustments |  |  |  | 2,923 | (20,395)
R&D tax credits |  |  |  | (10,555) | (5,990)
Rate changes |  |  |  | 2,443 | (29,238)
Valuation allowance |  |  |  | 85,046 | 87,677
Other |  |  |  | 85 | 111
Income tax provision |  | $ 93 | $ 1,221 | $ 1,686 | $ 7,124
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |
Foreign rate differential(1) | [1] |  |  | 16.78% | 13.36%
Permanent disallowed IPR&D |  |  |  | (12.40%) |
Nondeductible changes in the fair value of investments and loss from equity method investment |  |  |  | 2.50% | (3.72%)
Nontaxable (loss) gain on deconsolidation of business |  |  |  | 1.83% | (5.18%)
Permanent adjustments |  |  |  | (0.33%) | 3.64%
R&D tax credits |  |  |  | 1.17% | 1.07%
Rate changes |  |  |  | (0.27%) | 5.21%
Change in Valuation Allowance |  |  |  | (9.46%) | (15.63%)
Other |  |  |  | (0.01%) | (0.02%)
Total income tax expense |  | (0.10%) | (18.10%) | (0.19%) | (1.27%)
[1] | Primarily related to operations in Switzerland, the United Kingdom, and other jurisdictions with statutory tax rates different than the Bermuda rate.

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