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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2020
May 14, 2020
Sep. 30, 2019
Document and Entity Information [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Mar. 31, 2020    
Document Transition Report false    
Entity File Number 001-37929    
Entity Registrant Name Myovant Sciences Ltd.    
Entity Incorporation, State or Country Code D0    
Entity Tax Identification Number 98-1343578    
Entity Address, Address Line One Suite 1, 3rd Floor    
Entity Address, Address Line Two 11-12 St. James’s Square    
Entity Address, City or Town London    
Entity Address, Postal Zip Code SW1Y 4LB    
Entity Address, Country GB    
City Area Code 207    
Local Phone Number 400-3351    
Title of 12(b) Security Common Shares, $0.000017727 par value per share    
Trading Symbol MYOV    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 245.2
Entity Common Stock, Shares Outstanding   89,869,374  
Documents Incorporated by Reference
Portions of the registrant’s definitive proxy statement for the 2020 Annual General Meeting of Shareholders (the “2020 Proxy Statement”) to be filed with the Securities and Exchange Commission pursuant to Regulation 14A not later than 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K are incorporated by reference into Part III of this Annual Report on Form 10-K to the extent stated herein.
   
Amendment Flag false    
Current Fiscal Year End Date --03-31    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001679082