Cover Page - shares	6 Months Ended
	Sep. 30, 2022	Oct. 21, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2022
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 Two	7th Floor
Entity Address, Address Line One	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 3351
Title of 12(b) Security	Common Shares, $0.000017727 par value per share
Trading Symbol	MYOV
Security Exchange Name	NYSE
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
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		96,802,808
Entity Central Index Key	0001679082
Amendment Flag	false
Current Fiscal Year End Date	--03-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2