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Share-Based Compensation (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Apr. 01, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost   $ 49,300,000   $ 49,300,000    
Unrecognized compensation expense, period for recognition       3 years 25 days    
Options granted (in shares)       1,710,760    
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   100,000 $ 300,000 $ 300,000 $ 500,000  
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   15,091 $ 100,000 29,976 $ 200,000  
Unrecognized compensation expense, related to stock options granted to consultants   $ 100,000   $ 100,000    
Unrecognized compensation expense, period for recognition related to stock options granted to consultants       1 year 10 months 18 days    
Options granted (in shares)     0 0 0  
Myovant 2016 Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common shares reserved for grant (in shares)   2,500,000 4,500,000 2,500,000 4,500,000  
Common shares reserved for grant, annual percentage increase     4.00%   4.00%  
Increase in common shares reserved for grant (in shares) 2,400,000          
Principal Executive Officer | Restricted stock units | RSL | RSL RSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expenses incurred under services agreements   $ 0 $ 0 $ 0 $ 0  
Awards granted (in shares)           66,845
Unrecognized compensation expense   $ 900,000   $ 900,000