v3.10.0.1
Document and Entity Information - shares
3 Months Ended
Jun. 30, 2018
Aug. 03, 2018
Document and Entity Information [Abstract]    
Entity Registrant Name Myovant Sciences Ltd.  
Entity Central Index Key 0001679082  
Document Type 10-Q  
Document Period End Date Jun. 30, 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   68,225,552
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q1