Description of Business and Liquidity	3 Months Ended	12 Months Ended
Description of Business and Liquidity	Jun. 30, 2021	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Liquidity	Note 1—Description of Business and Liquidity (A) Description of Business Roivant Sciences Ltd. (inclusive of its consolidated subsidiaries, the “Company” or “RSL”), aims to improve health by rapidly delivering innovative medicines and technologies to patients. The Company does this by building biotech and healthcare technology companies (“Vants”) and deploying technology to drive greater efficiency in research and development and commercialization. In addition to biopharmaceutical subsidiaries, the Company also builds technology Vants focused on improving the process of developing and commercializing medicines. The Company was founded on April 7, 2014 as a Bermuda exempted limited company. The Company has determined that it has one operating and reporting segment as it allocates resources and assesses financial performance on a consolidated basis. The Company’s subsidiaries are wholly owned subsidiaries and majority-owned or controlled subsidiaries. Refer to Note 3, “Investments” for further discussion of the Company’s investments in unconsolidated entities . (B) Liquidity The Company has incurred significant losses and negative cash flows from operations since its inception. As of June 30, 2021, the Company had cash and cash equivalents of approximately $2.0 billion and its accumulated deficit was approximately $2.0 billion. For the three months ended June 30, 2021 and 2020, the Company incurred net losses of $101.1 million and $8.0 million, respectively. The Company has historically financed its operations primarily through the sale of equity securities, sale of subsidiary interests, debt financings and revenue generated from licensing and collaboration arrangements. The Company has not generated any revenues to date from the sale of its product candidates and does not anticipate generating any revenues from the sale of its product candidates unless and until it successfully completes development and obtains regulatory approval to market its product candidates. Management expects to incur additional losses in the future to fund its operations and conduct product research and development and recognizes the need to raise additional capital to fully implement its business plan. The Company intends to raise such additional capital through the issuance of equity securities, debt financings or other sources in order to further implement its business plan. However, if such financing is not available at adequate levels, the Company will need to reevaluate its operating plan and may be required to delay the development of its product candidates or take other steps to conserve capital. The Company expects its existing cash and cash equivalents will be sufficient to fund its committed operating expenses and capital expenditure requirements for at least the next 12 months from the date of issuance of these condensed consolidated financial statements.	Note 1—Description of Business and Liquidity (A) Description of Business Roivant Sciences Ltd., inclusive of its consolidated subsidiaries (the “Company” or “RSL”), aims to improve health by rapidly delivering innovative medicines and technologies to patients. The Company does this by building biotech and healthcare technology companies (“Vants”) and deploying technology to drive greater efficiency in research and development and commercialization. In addition to biopharmaceutical subsidiaries, the Company also builds technology Vants focused on improving the process of developing and commercializing medicines. The Company was founded on April 7, 2014 as a Bermuda exempted limited company. The Company has determined that it has one operating and reporting segment as it allocates resources and assesses financial performance on a consolidated basis. The Company’s subsidiaries are wholly owned subsidiaries and majority-owned or controlled subsidiaries. Refer to Note 3, “Investments” for further discussion of the Company’s investments in unconsolidated entities. (B) Liquidity The Company has incurred significant losses and negative cash flows from operations since its inception. As of March 31, 2021, the Company had cash and cash equivalents of approximately $2.1 billion and its accumulated deficit was approximately $1.9 billion. For the years ended March 31, 2021 and 2020, the Company incurred losses from continuing operations of $900.2 million and $568.1 million, respectively. The Company has historically financed its operations primarily through the sale of equity securities, sale of subsidiary interests, debt financings and revenue generated from licensing and collaboration arrangements. The Company has not generated any revenues to date from the sale of its product candidates and does not anticipate generating any revenues from the sale of its product candidates unless and until it successfully completes development and obtains regulatory approval to market its product candidates. Management expects to incur additional losses in the future to fund its operations and conduct product research and development and recognizes the need to raise additional capital to fully implement its business plan. The Company intends to raise such additional capital through the issuance of equity securities, debt financings or other sources in order to further implement its business plan. However, if such financing is not available at adequate levels, the Company will need to reevaluate its operating plan and may be required to delay the development of its product candidates or take other steps to conserve capital. The Company expects its existing cash and cash equivalents will be sufficient to fund its committed operating expenses and capital expenditure requirements for at least the next 12 months from the date of issuance of these consolidated financial statements.