| Document and Entity Information | Dec. 03, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Dec. 03, 2024 |
| Entity File Number | 001-40782 |
| Entity Registrant Name | Roivant Sciences Ltd. |
| Entity Central Index Key | 0001635088 |
| Entity Incorporation, State or Country Code | D0 |
| Entity Tax Identification Number | 98-1173944 |
| Entity Address, Address Line One | 7th Floor |
| Entity Address, Address Line Two | 50 Broadway |
| Entity Address, City or Town | London |
| Entity Address, Country | GB |
| Entity Address, Postal Zip Code | SW1H 0DB |
| City Area Code | 207 |
| Local Phone Number | 400-3347 |
| Title of 12(b) Security | Common Shares, $0.0000000341740141 per share |
| Trading Symbol | ROIV |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
