Cover [Abstract] 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 Statement of Financial Position [Abstract] Statement [Table] Statement [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Statement [Line Items] Statement [Line Items] Assets [Abstract] Assets Assets Total assets Assets, Current [Abstract] Current assets: Assets, Current Total current assets Other Assets, Current Other current assets Total other current assets Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Restricted Cash, Current Restricted cash Long-term Investments Long-term investment Carrying value of long-term investment Operating Lease, Right-of-Use Asset Operating lease right-of-use assets Other Assets, Noncurrent Other assets Investments, Fair Value Disclosure Investments measured at fair value Aggregate fair value investment Investment Property, Plant and Equipment, Net Property and equipment, net Restricted Cash, Noncurrent Restricted cash, net of current portion Liabilities and Equity [Abstract] Liabilities, Redeemable Noncontrolling Interest and Shareholders' Equity Liabilities, Current [Abstract] Current liabilities: Accrued Liabilities, Current Accrued expenses Total accrued expenses Accounts Payable, Current Accounts payable Liabilities, Current Total current liabilities Operating Lease, Liability, Current Operating lease liabilities Other Liabilities, Current Other current liabilities Total other current liabilities Deferred Consideration Liability Current Deferred consideration liability Deferred consideration liability current. Long-term Debt, Excluding Current Maturities Long-term debt Total long term debt, net Long term debt Stockholders' Equity Attributable to Noncontrolling Interest Noncontrolling interests Operating Lease, Liability, Noncurrent Operating lease liabilities, noncurrent Other Liabilities, Noncurrent Other liabilities Commitments and Contingencies Commitments and Contingencies Liabilities Total liabilities Liabilities and Equity Total liabilities, redeemable noncontrolling interest and shareholders' equity Stockholders' Equity Attributable to Parent [Abstract] Shareholders' equity: Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive (loss) income Common Stock, Value, Issued Common shares Additional Paid in Capital Additional paid-in capital Stockholders' Equity Attributable to Parent Shareholders' equity attributable to Roivant Sciences Ltd. Subscriptions Receivable Subscription receivable Subscription receivable Subscriptions receivable. Retained Earnings (Accumulated Deficit) 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 Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Issued Common stock, shares issued Common stock issued Common Stock, Shares, Outstanding Common stock, shares outstanding Common stock Long-term Debt, Fair Value Long term debt accounted under fair value option Common Stock, Par or Stated Value Per Share Common stock, par or stated value per share Income Statement [Abstract] Income Amounts Attributable to Parent, Disclosures [Abstract] Amounts attributable to Roivant Sciences Ltd.: Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Loss from continuing operations, net of tax Loss from continuing operations, net of tax, attributable to Roivant Sciences Ltd. Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Income from discontinued operations, net of tax Net income from discontinued operations, net of tax, attributable to Roivant Sciences Ltd. Net Income (Loss) Attributable to Parent Net loss attributable to Roivant Sciences Ltd. Net (loss) income 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 Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Loss from continuing operations, net of tax Loss from continuing operations, net of tax 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 Income (Loss) from Continuing Operations, Per Basic and Diluted Share Basic and diluted loss from continuing operations Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic and Diluted Share Basic and diluted income from discontinued operations Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Basic and diluted weighted average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted Diluted Weighted Average Number of Shares Outstanding, Basic Basic Weighted Average Number of Shares Outstanding, Basic and Diluted Weighted average shares outstanding—basic and diluted Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Loss from continuing operations before income taxes Total loss before income taxes Revenue from Contract with Customer, Excluding Assessed Tax Revenue, net Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Income from discontinued operations, net of tax Income from discontinued operations, net of tax Income Tax Expense (Benefit) Income tax expense Income tax provision 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 (income) expense, net Gain (Loss) on Investments Change in fair value of investments Gain (loss) on remeasurement of investment 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 Or Loss On Deconsolidation Of Subsidiary Gain on deconsolidation of subsidiary Gain or (loss) on deconsolidation of subsidiary. Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net loss Net loss Net loss Statement of Stockholders' Equity [Abstract] Other Comprehensive Income (Loss), Tax [Abstract] Other comprehensive loss: Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Foreign currency translation adjustment Unrealized foreign currency translation adjustment Other Comprehensive Income (Loss), Net of Tax Total other comprehensive loss 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 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] Common Stock [Member] Common Stock [Member] Noncontrolling Interest [Member] Noncontrolling Interest [Member] Retained Earnings [Member] Accumulated Deficit [Member] Subscriptions Receivables [Member] Subscriptions Receivables [Member] Subscriptions Receivables [Member] Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock Purchase of subsidiary convertible and redeemable preferred stock Capital Contributions To Subsidiaries Cash contributions to majority-owned subsidiaries Capital Contributions To Subsidiaries Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Shares Share-based compensation, shares Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Shares APIC, Share-based Payment Arrangement, Increase for Cost Recognition Share-based compensation Consolidation of Unconsolidated Entity Consolidation of unconsolidated entity Consolidation of Unconsolidated Entity Conversion of Subsidiary Convertible Promissory Notes Conversion of subsidiary convertible promissory notes Conversion of Subsidiary Convertible Promissory Notes 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 paid 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 Exercise of Subsidiary Stock Options and Vesting of Subsidiary Restricted Stock Units Exercise of subsidiary stock options and vesting of subsidiary restricted stock units Exercise of Subsidiary Stock Options and Vesting of Subsidiary Restricted Stock Units Gain (Loss) on Disposition of Stock in Subsidiary Sale of interests in subsidiaries Gain (loss) on sale of stock transactions Issuance of Equity by Subsidiary to the Company upon Business Combination and Recapitalization Issuance of equity by subsidiary to the Company upon Business Combination and recapitalization Issuance of Equity by Subsidiary to the Company upon Business Combination and Recapitalization Issuance of Equity by Subsidiary upon Business Combination and Recapitalization Issuance of equity by subsidiary upon Business Combination and recapitalization Issuance of Equity by Subsidiary upon Business Combination and Recapitalization Issuance of Equity Instruments Issuance of equity instruments Issuance of Equity Instruments 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 Temporary Equity, Stock Issued During Period, Value, New Issues Issuance of subsidiary convertible and redeemable preferred stock, net Purchase of Subsidiary Common Shares Value Purchase of subsidiary common shares Purchase of Subsidiary Common Shares Value Repurchase of Common Shares and Other Equity Instruments Shares Repurchase of common shares and other equity instruments, shares Repurchase of Common Shares and Other Equity Instruments Shares Repurchase of Common Shares and Other Equity Instruments Value Repurchase of common shares and other equity instruments Repurchase of Common Shares and Other Equity Instruments Value Repurchase of Equity Awards Repurchase of equity awards Repurchase of Equity Awards Settlement of Liability Classified Instruments Settlement in equity of liability-classified instruments Settlement of Liability Classified Instruments Shares, Outstanding Balance, shares Balance, shares Stock Issued During Period, Shares, New Issues Issuance of the Company's common shares, net, shares Stock issued Public offering shares of common stock Stock Issued During Period, Value, New Issues Issuance of the Company's common shares Stock issued, value Stock Issued During Period, Value, Stock Options Exercised Exercise of subsidiary stock options Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests Balance, temporary equity Balance, temporary equity 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: Deferred Offering And Financing Costs Included In Accounts Payable And Accrued Expenses Deferred offering and financing costs included in accounts payable and accrued expenses Deferred offering and financing costs included in accounts payable and accrued expenses. Operating Lease Right of Use Assets and Amounts Reclassified from Other Liabilities to Operating Lease Liabilities Operating lease right-of-use assets and operating lease liabilities, including amounts reclassified from other current liabilities and other liabilities to operating lease liabilities, recognized upon the adoption of ASC 842, Leases, on April 1, 2019 Operating Lease Right of Use Assets and Amounts Reclassified from Other Liabilities to Operating Lease Liabilities Other Non Cash Transactions Other Other Non Cash Transactions Issuance Of Subsidiary Warrant In Connection With Debt Financing Issuance of subsidiary warrant in connection with debt financing Issuance of subsidiary warrant in connection with debt financing. Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Operating lease right-of-use assets obtained and exchanged for operating lease liabilities Operating lease ROU assets obtained in exchange for operating lease liabilities Noncash Investing and Financing Items [Abstract] Supplemental disclosure of noncash activities: Conversion Of Subsidiary Convertible Promissory Notes To Common Shares Conversion of subsidiary convertible promissory notes to common shares. Subscription Receivable Related To Issuance Of Subsidiary Common Shares Subscription Receivable Related To Issuance Of Subsidiary Common Shares. 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 deferred offering and loan origination costs Payment for Debt Maintenance Fee by Subsidiary Payments for Purchase of Subsidiary Convertible and Redeemable Preferred Stock Purchase of subsidiary convertible and redeemable preferred stock Payments for Purchase of Subsidiary Convertible and Redeemable Preferred Stock Payments for Repurchase of Equity Repurchase of equity awards Total cash paid Payments of Stock Issuance Costs Offering costs paid Proceeds from Issuance of Common Stock Proceeds from issuance of the Company's common shares, net Net proceeds of common stock Proceeds from Issuance of Debt Proceeds from issuance of liability instruments Proceeds from Issuance of Equity by Subsidiary Upon Business Combination and Recapitalization Proceeds from issuance of equity by subsidiary upon Business Combination and recapitalization Proceeds from Issuance of Equity by Subsidiary Upon Business Combination and Recapitalization 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 Issuance of Subsidiary Convertible and Redeemable Preferred Stock Net Proceeds from issuance of subsidiary convertible and redeemable preferred stock, net Proceeds from Issuance of Subsidiary Convertible and Redeemable Preferred Stock 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 Purchase of Subsidiary Common Shares Purchase of subsidiary common shares Purchase of Subsidiary Common Shares 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 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 used in investing activities Payments to Acquire Businesses, Net of Cash Acquired Acquisitions, net of cash acquired Payment to acquire business, net Payments to Acquire Investments in Unconsolidated Entities Investments in unconsolidated entities Payments to Acquire Investments in Unconsolidated Entities Payments to Acquire Marketable Securities Purchase of marketable securities Payments to Acquire Property, Plant, and Equipment Purchase of property and equipment Proceeds from Divestiture of Businesses Proceeds from sale of business, net of cash disposed Proceeds from Sale and Maturity of Marketable Securities Maturity of marketable securities Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: 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 Gain (Loss) on Disposition of Business Gain on sale of business Other Noncash Income (Expense) Other Share-based Payment Arrangement, Noncash Expense Share-based compensation Share-based compensation expense Gain On Termination Of Equity Interest Options Gain on termination of Sumitomo Options Gain on termination of equity interest options. Research and Development in Process Acquired in-processresearch and development Increase (Decrease) in Operating Capital [Abstract] Changes in assets and liabilities, net of effects from acquisition and divestiture: Increase (Decrease) in Accounts Payable, Trade Accounts payable Increase (Decrease) in Accrued Liabilities Accrued expenses Increase (Decrease) in Deferred Liabilities Deferred consideration liability 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 Net Cash Provided by (Used in) Operating Activities Net cash used in operating activities Supplemental Cash Flow Information [Abstract] Supplemental disclosure of cash paid: Income Taxes Paid, Net Income taxes paid Interest Paid, Excluding Capitalized Interest, Operating Activities Interest paid Organization, Consolidation and Presentation of Financial Statements [Abstract] Business Description and Basis of Presentation [Text Block] Description of Business and Liquidity Accounting Policies [Abstract]