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Share-Based Compensation (Narrative) (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Aug. 26, 2019
USD ($)
$ / shares
shares
Apr. 01, 2019
shares
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2018
USD ($)
Mar. 31, 2017
shares
Aug. 25, 2019
$ / shares
Mar. 31, 2019
shares
Jun. 30, 2016
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Unrecognized compensation cost | $     $ 78,200,000   $ 78,200,000          
Unrecognized compensation expense, period for recognition         2 years 10 months 24 days          
Vested executive options subject to one-year exercise restriction period (in shares)     735,428   735,428          
Options vested and unvested outstanding (in shares)     7,646,460   7,646,460       5,396,465  
Stock-based compensation expense, expensed on repricing date | $     $ 7,931,000 $ 4,725,000 $ 14,383,000 $ 8,969,000        
Employee Stock Options, Repriced                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Repricing ratio 1                  
Exercise price (in USD per share) | $ / shares $ 7.78                  
Options vested and unvested outstanding (in shares) 5,095,013                  
Stock-based compensation expense, expensed on repricing date and amortized | $ $ 9,200,000                  
Stock-based compensation expense, expensed on repricing date | $ $ 800,000                  
Performance Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awards granted (in shares) 408,510                  
Performance Stock Units, Time-Based Vesting                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awards granted (in shares) 272,338                  
Share of awards granted         66.66%          
Performance Stock Units, Vesting Based Upon Clinical Trial and Regulatory Milestones                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Awards granted (in shares) 136,172                  
Share of awards granted         33.33%          
Myovant 2016 Equity Incentive Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common shares reserved for grant (in shares)     1,500,000   1,500,000         4,500,000
Common shares reserved for grant, annual percentage increase                   4.00%
Increase in common shares reserved for grant (in shares)   2,900,000                
Executives, Subject to Exercise Restriction Period | Employee Stock Options, Repriced                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Unrecognized compensation expense, period for recognition 1 year                  
Vested executive options subject to one-year exercise restriction period (in shares) 735,428                  
Repricing restriction period 1 year                  
Expense being amortized over exercise restriction period | $ $ 1,100,000                  
Employees, Other Than Executives, Subject to Exercise Restriction Period | Employee Stock Options, Repriced                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Unrecognized compensation expense, period for recognition 3 years 2 months 12 days                  
Stock-based compensation expense, amortized | $ $ 7,300,000                  
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          
Minimum | Employee Stock Options, Repriced                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Exercise price (in USD per share) | $ / shares               $ 8.82    
Maximum | Employee Stock Options, Repriced                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Exercise price (in USD per share) | $ / shares               24.44    
Median | Employee Stock Options, Repriced                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Exercise price (in USD per share) | $ / shares               $ 17.28