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Net Loss per Common Share - Summary of Basic and Diluted Net Income Per Share of Common Stock (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Earnings Per Share [Abstract] |  |
Loss from continuing operations, net of tax | $ (900,233) | $ (568,110)
Net loss from continuing operations, net of tax, attributable to noncontrolling interest | (90,999) | (48,716)
Loss from continuing operations, net of tax, attributable to Roivant Sciences Ltd. | (809,234) | (519,394)
Deemed dividend on repurchase of redeemable noncontrolling interest relating to subsidiary convertible and redeemable preferred stock |  | (77,777)
Basic and diluted loss from continuing operations, net of tax, attributable to Roivant Sciences Ltd. | (809,234) | (597,171)
Income from discontinued operations, net of tax | 0 | 1,578,426
Net loss from discontinued operations, net of tax, attributable to noncontrolling interest |  | (141,477)
Net income from discontinued operations, net of tax, attributable to Roivant Sciences Ltd. | 0 | 1,719,903
Basic and diluted income from discontinued operations, net of tax |  | 1,719,903
Basic and diluted net (loss) income attributable to Roivant Sciences | $ (809,234) | $ 1,122,732

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