v3.10.0.1
Document and Entity Information - shares
9 Months Ended
Dec. 31, 2018
Feb. 01, 2019
Document and Entity Information [Abstract]    
Entity Registrant Name Myovant Sciences Ltd.  
Entity Central Index Key 0001679082  
Document Type 10-Q  
Document Period End Date Dec. 31, 2018  
Amendment Flag false  
Current Fiscal Year End Date --03-31  
Entity Current Reporting Status Yes  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   70,812,541
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Entity Emerging Growth Company true  
Entity Ex Transition Period true  
Entity Small Business false