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Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Mar. 31, 2021 | Mar. 31, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment | $ 180,359 | $ 188,978 | $ 93,445
Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets held in Trust Account | 1,521,021 | 1,609,575 | 1,968,107
Debt issued by Dermavant to NovaQuest | 155,200 | 150,100 | 89,100
Liability instruments measured at fair value | 5,906 | 67,893 | 102,373
Total liabilities at fair value | 161,106 | 217,993 | 191,473
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets held in Trust Account | 1,451,834 | 1,533,538 | 1,945,045
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets held in Trust Account | 69,187 | 76,037 | 23,062
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt issued by Dermavant to NovaQuest | 155,200 | 150,100 | 89,100
Liability instruments measured at fair value | 5,906 | 67,893 | 102,373
Total liabilities at fair value | 161,106 | 217,993 | 191,473
Money Market Funds [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Money market funds | 1,340,662 | 1,420,597 | 1,874,662
Money Market Funds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Money market funds | 1,340,662 | 1,420,597 | 1,874,662
Other Investment [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment | 11,935 | 11,129 | 8,880
Other Investment [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment | 11,935 | 11,129 | 8,880
Sio Gene Therapies Inc [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment | 50,700 | 48,500 | 45,300
Sio Gene Therapies Inc [Member] | Common Stock [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment | 50,716 | 48,487 | 45,329
Sio Gene Therapies Inc [Member] | Common Stock [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment | 50,716 | 48,487 | 45,329
Arbutus Biopharma Corporation [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment | 117,700 | 129,400 | 39,200
Arbutus Biopharma Corporation [Member] | Common Stock [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment | 48,521 | 53,325 | 16,174
Arbutus Biopharma Corporation [Member] | Common Stock [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment | 48,521 | 53,325 | 16,174
Arbutus Biopharma Corporation [Member] | Convertible Preferred Stock [Member] | Fair Value, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment | 69,187 | 76,037 | 23,062
Arbutus Biopharma Corporation [Member] | Convertible Preferred Stock [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment | $ 69,187 | $ 76,037 | $ 23,062

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