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Share-Based Compensation (Narrative) (Details) - USD ($)
3 Months Ended
Apr. 01, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost   $ 47,900,000    
Unrecognized compensation expense, period for recognition   3 years 3 months 5 days    
Options granted (in shares)   1,258,340    
Employees of Affiliated Entities | Share-based Compensation, Expense Allocated to Company        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expenses incurred under services agreements   $ 200,000 $ 200,000  
Non-employee Stock Option | Employees of Affiliated Entities | Stock Options Granted to Non-Employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation related to stock options granted to consultants   14,885 $ 100,000  
Unrecognized compensation expense, related to stock options granted to consultants   $ 100,000    
Unrecognized compensation expense, period for recognition related to stock options granted to consultants   2 years 1 month 19 days    
Options granted (in shares)     0  
Myovant 2016 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common shares reserved for grant (in shares)   2,800,000   4,500,000
Common shares reserved for grant, annual percentage increase       4.00%
Increase in common shares reserved for grant (in shares) 2,400,000      
Principal Executive Officer | Restricted stock units | RSL RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expenses incurred under services agreements   $ 0 $ 0  
Unrecognized compensation expense   $ 900,000    
Principal Executive Officer | Restricted stock units | RSL | RSL RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted (in shares)   66,845