v3.8.0.1
Document and Entity Information - shares
9 Months Ended
Dec. 31, 2017
Feb. 09, 2018
Document and Entity Information    
Entity Registrant Name Myovant Sciences Ltd.  
Entity Central Index Key 0001679082  
Document Type 10-Q  
Document Period End Date Dec. 31, 2017  
Amendment Flag false  
Current Fiscal Year End Date --03-31  
Entity Current Reporting Status Yes  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   60,989,395
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q3