Cover [Abstract] Statement [Table] Statement [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Warrant [Member] Common Stock [Member] Common Stock [Member] Statement [Line Items] Statement [Line Items] Amendment Flag Amendment Flag Document Type Document Type Entity Central Index Key Entity Central Index Key Entity Emerging Growth Company Emerging Growth Company Entity Ex Transition Period Entity Ex Transition Period Entity Filer Category Entity Filer Category Entity Registrant Name Entity Registrant Name Entity Small Business Entity Small Business Entity Common Stock, Shares Outstanding Entity Shell Company Title of 12(b) Security Trading Symbol Security Exchange Name Entity Address, Country Country Region Current Fiscal Year End Date Entity File Number Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line Two Entity Address, City or Town Entity Address, Postal Zip Code City Area Code Local Phone Number Document Quarterly Report Document Transition Report Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Entity Current Reporting Status Entity Interactive Data Current Statement of Financial Position [Abstract] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Assets [Abstract] Assets Assets Total assets Assets, Current [Abstract] Current assets: Assets, Current Total current assets Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Other Assets, Current Other current assets Total other current assets Restricted Cash, Current Restricted cash Operating Lease, Right-of-Use Asset Operating lease right-of-use assets Other Assets, Noncurrent Other assets Long-term Investments Long-term investment Carrying value of long-term investment Property, Plant and Equipment, Net Property and equipment, net Restricted Cash, Noncurrent Restricted cash, net of current portion Investments, Fair Value Disclosure Investments measured at fair value Aggregate fair value investment Investment Liabilities and Equity [Abstract] Liabilities, Redeemable Noncontrolling Interest and Shareholders' Equity Other Liabilities, Noncurrent Other liabilities Liabilities, Current [Abstract] Current liabilities: Accrued Liabilities, Current Accrued expenses Total accrued expenses Accounts Payable, Current Accounts payable Liabilities, Current Total current liabilities Other Liabilities, Current Other current liabilities Total other current liabilities Operating Lease, Liability, Current Operating lease liabilities Deferred Consideration Liability Current Deferred consideration liability Deferred consideration liability current. Operating Lease, Liability, Noncurrent Operating lease liabilities, noncurrent Long-term Debt, Excluding Current Maturities Long-term debt (includes $168,200 and $150,100 accounted for under the fair value option at September 30, 2021 and March 31, 2021, respectively) Total long term debt, net Stockholders' Equity Attributable to Noncontrolling Interest Noncontrolling interests Stockholders' Equity Attributable to Parent [Abstract] Shareholders' equity: Additional Paid in Capital Additional paid-in capital Common Stock, Value, Issued Common shares, par value $0.0000000341740141 per share, 7,000,000,000 shares authorized and 684,789,169 and 651,576,293 shares issued and outstanding at September 30, 2021 and March 31, 2021, respectively Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income Stockholders' Equity Attributable to Parent Shareholders' equity attributable to Roivant Sciences Ltd. Subscriptions Receivable Subscription receivable Subscriptions receivable. Retained Earnings (Accumulated Deficit) Accumulated deficit Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total shareholders' equity Balance Balance Liability Instruments Measured At Fair Value Liability instruments measured at fair value Liability instruments measured at fair value. Redeemable Noncontrolling Interest, Equity, Carrying Amount Redeemable noncontrolling interest Liabilities Total liabilities Liabilities and Equity Total liabilities, redeemable noncontrolling interest and shareholders' equity Commitments and Contingencies Commitments and contingencies (Note 12) Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Issued Common stock, shares issued Common Stock, Shares, Outstanding Common stock, shares outstanding Common Stock, Par or Stated Value Per Share Common stock, par or stated value per share Temporary Equity, Par or Stated Value Per Share Long-term Debt, Fair Value Long term debt accounted under fair value option Income Statement [Abstract] Net Income (Loss) Attributable to Parent Net loss attributable to Roivant Sciences Ltd. Net Income (Loss) Attributable to Noncontrolling Interest Net loss attributable to noncontrolling interests Operating Expenses [Abstract] Operating expenses: General and Administrative Expense General and administrative Operating Expenses Total operating expenses Research and Development Expense Research and development Research and development expense Operating Costs Cost of revenues Operating costs. Operating Income (Loss) Loss from operations Revenue from Contract with Customer, Excluding Assessed Tax Revenue, net Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Loss before income taxes Earnings Per Share, Basic and Diluted [Abstract] Basic and diluted net (loss) income per common share: Earnings Per Share, Basic and Diluted Net loss per common share—basic and diluted Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Basic and diluted weighted average shares outstanding: Weighted Average Number of Shares Outstanding, Basic and Diluted Weighted average shares outstanding—basic and diluted Income Tax Expense (Benefit) Income tax expense Other Nonoperating Income (Expense) [Abstract] Other income (expense): Gain Loss on Fair Value of Debt and Liability Instruments Change in fair value of debt and liability instruments Gain Loss on Fair Value of Debt and Liability Instruments Other Nonoperating Income (Expense) Other expense (income), net Gain (Loss) on Investments Change in fair value of investments Deconsolidation and Consolidation on Gain or Loss of Consolidated Entity Gain on deconsolidation of subsidiary and consolidation of unconsolidated entity Deconsolidation and consolidation on gain or loss of consolidated entity. Equity Interest Option to Third Party Purchaser Gain On Termination Gain on termination of Sumitomo Options Gain on termination of Sumitomo Options Equity interest option to third party purchaser gain on termination. Gain on Sale of Investments Gain on sale of investment Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net loss Net loss Net loss Statement of Stockholders' Equity [Abstract] Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive loss attributable to Roivant Sciences Ltd. Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive loss attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive loss Other Comprehensive Income (Loss), Tax [Abstract] Other comprehensive income (loss): Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Foreign currency translation adjustment Other Comprehensive Income (Loss), Net of Tax Total other comprehensive income (loss) Statement of Partners' Capital [Abstract] Redeemable Noncontrolling Interest [Member] Redeemable Noncontrolling Interest [Member] Redeemable Noncontrolling Interest [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] AOCI Attributable to Parent [Member] AOCI Attributable to Parent [Member] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Noncontrolling Interest [Member] Noncontrolling Interest [Member] Subscriptions Receivables [Member] Subscriptions Receivables [Member] Subscriptions Receivables [Member] Retained Earnings [Member] Accumulated Deficit [Member] Consolidation of Unconsolidated Entity Consolidation of unconsolidated entity Consolidation of Unconsolidated Entity Capital Contributions To Subsidiaries Cash contributions to majority-owned subsidiaries Capital Contributions To Subsidiaries APIC, Share-based Payment Arrangement, Increase for Cost Recognition Share-based compensation Deconsolidation Of Subsidiary Deconsolidation of subsidiary Deconsolidation Of Subsidiary Issuance of Subsidiary Common Shares Net Value Issuance of subsidiary common shares, net of issuance costs Issuance of Subsidiary Common Shares Net Value Issuance of Subsidiary Common Shares to the Company Value Issuance of subsidiary common shares to the Company Issuance of Subsidiary Common Shares to the Company Value Issuance of Subsidiary Warrants Issuance of subsidiary warrants Issuance of Subsidiary Warrants Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Foreign currency translation adjustment Stock Issued During Period, Value, Stock Options Exercised Exercise of subsidiary stock options Repurchase of Equity Awards Repurchase of equity awards Repurchase of Equity Awards Shares, Outstanding Balance, shares Balance, shares Stock Issued During Period Shares Common Shares Upon Closing Of Business Combination And PIPE Financing Issuance of the Company's common shares upon closing of Business Combination and PIPE Financing, net of issuance costs (in shares) Stock issued during period shares common shares upon closing of business combination and PIPE financing. Stock Issued During Period Value Common Shares Upon Closing Of Business Combination And PIPE Financing Issuance of the Company's common shares upon closing of Business Combination and PIPE Financing, net of issuance costs Stock issued during period value common shares upon closing of business combination and PIPE financing. Stock Issued during Period Shares Common Shares Related To Settlement Of Transaction Consideration Issuance of the Company's common shares related to settlement of transaction consideration (in shares) Stock issued during period shares common shares related to settlement of transaction consideration Stock Issued during Period Value Common Shares Related To Settlement Of Transaction Consideration Issuance of the Company's common shares related to settlement of transaction consideration Stock issued during period value common shares related to settlement of transaction consideration. Stock Issued during Period Value Subsidiary Preferred Shares Issuance of subsidiary preferred shares Stock issued during period value subsidiary preferred shares. Stock Issued During Period Value Subsidiary Common And Preferred Shares To The Company Issuance of subsidiary common and preferred shares to the Company Stock issued during period value subsidiary common and preferred shares to the company. Adjustments Of Payment Of Subscription Receivable Value Equity Component Payment of subscription receivable Adjustments of payment of subscription receivable value equity component. Adjustments Due To Transfer From To Noncontrolling Interest Value Transfer (from) to noncontrolling interest Adjustments due to transfer from to noncontrolling interest value. Statement of Cash Flows [Abstract] Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Net change in cash, cash equivalents and restricted cash Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Non-cash investing and financing activities: Other Non Cash Transactions Other Other Non Cash Transactions Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Operating lease right-of-use assets obtained and exchanged for operating lease liabilities Offering Costs Included In Accounts Payable And Accrued Expenses Offering costs included in accounts payable and accrued expenses Offering costs included in accounts payable and accrued expenses. Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Increase (Decrease) in Operating Capital [Abstract] Changes in assets and liabilities, net of effects from acquisition and divestiture: Increase (Decrease) in Accrued Liabilities Accrued expenses Increase Decrease In Operating Lease Liabilities Operating lease liabilities Increase decrease in operating lease liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Other Increase (Decrease) in Accounts Payable, Trade Accounts payable Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash used in operating activities: Income (Loss) from Equity Method Investments Loss from equity method investment Other Noncash Income (Expense) Other Share-based Payment Arrangement, Noncash Expense Share-based compensation Research and Development in Process Acquired in-process research and development Gain On Termination Of Equity Interest Options Gain on termination of Sumitomo Options Gain on termination of equity interest options. Gain On Deconsolidation Of Subsidiary And Consolidation Of Unconsolidated Entity Gain on deconsolidation of subsidiary and consolidation of unconsolidated entity Gain on deconsolidation of subsidiary and consolidation of unconsolidated entity. Net Cash Provided by (Used in) Operating Activities Net cash used in operating activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities Payment for Debt Maintenance Fee by Subsidiary Payment of offering and loan origination costs Payment for Debt Maintenance Fee by Subsidiary Payments for Repurchase of Equity Repurchase of equity awards Proceeds from Issuance of Subsidiary Common Shares Net Proceeds from issuance of subsidiary common shares, net of issuance costs paid Proceeds from Issuance of Subsidiary Common Shares Net Proceeds from Stock Options Exercised Proceeds from exercise of subsidiary stock options Proceeds from Subsidiary Debt Financings Net Proceeds from subsidiary debt financings, net of financing costs paid Proceeds from Subsidiary Debt Financings Net Repayment of Long Term Debt and Convertible Debt by Subsidiary Repayment of long-term debt by subsidiary Repayment of Long Term Debt and Convertible Debt by Subsidiary Proceeds From Business Combination And PIPE Financing Proceeds from Business Combination and PIPE Financing Proceeds from business combination and PIPE financing. Proceeds From Payment Of Subscription Receivable Proceeds from payment of subscription receivable Proceeds from payment of subscription receivable. Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities: Cash Acquired Upon Consolidation of Unconsolidated Entity Cash acquired upon consolidation of unconsolidated entity Cash Acquired Upon Consolidation of Unconsolidated Entity Cash Divested from Deconsolidation Cash disposed upon deconsolidation of subsidiary Net Cash Provided by (Used in) Investing Activities Net cash provided by (used in) investing activities Payments to Acquire Property, Plant, and Equipment Purchase of property and equipment Payments to Acquire Investments in Unconsolidated Entities Investments in unconsolidated entities Payments to Acquire Investments in Unconsolidated Entities Proceeds from Sale, Maturity and Collection of Investments Proceeds from sale of investment Organization, Consolidation and Presentation of Financial Statements [Abstract] Business Description and Basis of Presentation [Text Block] Description of Business and Liquidity Accounting Policies [Abstract] Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Business Combination and Asset Acquisition [Abstract] Business Combination Disclosure [Text Block] Business Combination with MAAC Investments, All Other Investments [Abstract] Investments and Other Noncurrent Assets [Text Block] Investments Business Combinations [Abstract] Asset Acquisitions and License Agreements Disclosure [Text Block] Asset Acquisitions and License Agreements Asset acquisitions and license agreements disclosure. Transaction Agreement [Abstract] Transaction Agreement. Transaction Agreement Disclosure [Text Block] Sumitomo Transaction Agreement Transaction Agreement Disclosure. Supplemental Balance Sheet Disclosures [Text Block] Balance Sheet Components