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Shareholders' Equity - (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Oct. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2023 | Sep. 19, 2022
Immunovant, Inc. [Member] |  |  |  |
Shareholders' Equity [Abstract] |  |  |  |
Ownership percentage |  |  | 55.00% |
Common Stock [Member] | Investor [Member] |  |  |  |
Shareholders' Equity [Abstract] |  |  |  |
Sale of common shares (in shares) |  | 19,600,685 |  |
Purchase price (in dollars per share) |  | $ 10.21 |  |
Net proceeds from sale of common stock |  | $ 199.8 |  |
Underwritten Public Offering [Member] | Immunovant, Inc. [Member] |  |  |  |
Shareholders' Equity [Abstract] |  |  |  |
Net proceeds of common stock | $ 466.7 |  |  |
Underwritten Public Offering [Member] | Common Stock [Member] | Immunovant, Inc. [Member] |  |  |  |
Shareholders' Equity [Abstract] |  |  |  |
Sale of common shares (in shares) | 8,475,500 |  |  |
Roivant participation of Immunovant Stock offering [Member] | Common Stock [Member] |  |  |  |
Shareholders' Equity [Abstract] |  |  |  |
Purchase price (in dollars per share) | $ 38 |  |  |
Common shares purchased by RSL (in shares) | 1,526,316 |  |  |
Option purchase additional shares of common stock (in shares) | 1,105,500 |  |  |
Private Placement [Member] | Common Stock [Member] | Immunovant, Inc. [Member] |  |  |  |
Shareholders' Equity [Abstract] |  |  |  |
Purchase price (in dollars per share) | $ 38 |  |  |
Common shares purchased by RSL (in shares) | 4,473,684 |  |  |
Cowen [Member] | At-the-Market Equity Offering Program[Member] |  |  |  |
Shareholders' Equity [Abstract] |  |  |  |
Common shares aggregate offering price authorized |  |  |  | $ 400.0
Common shares aggregate offering price authorized, remaining capacity available |  |  | $ 400.0 |

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