v3.26.1
Cover - USD ($)
$ in Billions
12 Months Ended
Mar. 31, 2026
May 12, 2026
Sep. 30, 2025
Entity Addresses [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Mar. 31, 2026    
Current Fiscal Year End Date --03-31    
Document Transition Report false    
Entity File Number 001-40782    
Entity Registrant Name ROIVANT SCIENCES LTD.    
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, Postal Zip Code SW1H 0DB    
Entity Address, Country GB    
Country Region 44    
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 Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 9.8
Entity Common Stock, Shares Outstanding   719,270,385  
Entity Central Index Key 0001635088    
Amendment Flag false    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Auditor Firm ID 42    
Wholly-owned Subsidiaries Address - NY      
Entity Addresses [Line Items]      
Entity Address, Address Line One 1 Pennsylvania Plaza    
Entity Address, Address Line Two 54th Floor    
Entity Address, City or Town New York    
Entity Address, Postal Zip Code 10119    
Entity Address, Country US    
Entity Address, State or Province NY    
Wholly-owned Subsidiaries Address - Switzerland      
Entity Addresses [Line Items]      
Entity Address, Address Line One Viaduktstrasse 8    
Entity Address, Address Line Two 4051 Basel    
Entity Address, Country CH