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Share-Based Compensation (Narrative) (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 27, 2019
USD ($)
shares
Aug. 26, 2019
USD ($)
$ / shares
shares
Apr. 01, 2019
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
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]                      
Vested executive options subject to one-year exercise restriction period (in shares)       735,428   735,428          
Options vested and unvested outstanding (in shares)       7,744,257   7,744,257       5,396,465  
Accelerated vesting of awards | $       $ 1,800,000   $ 10,200,000          
Unrecognized compensation cost | $       $ 58,800,000   $ 58,800,000          
Unrecognized compensation expense, period for recognition           2 years 9 months 18 days          
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 | $   $ 9,200,000                  
Stock Options                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Accelerated vesting of awards (in shares) 849,212                    
Accelerated vesting of awards | $ $ 11,200,000                    
Performance Stock Units                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Accelerated vesting of awards (in shares) 108,640                    
Accelerated vesting of awards | $ $ 800,000                    
Awards granted (in shares)   408,510                  
Unvested awards (in shares)       299,870   299,870          
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 | Stock Options, Repriced                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vested executive options subject to one-year exercise restriction period (in shares)   735,428                  
Repricing restriction period   1 year                  
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      
Expenses incurred under agreements | $       $ 0 $ 0 $ 0 $ 0        
Minimum | Stock Options, Repriced                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Exercise price (in USD per share) | $ / shares                 $ 8.82    
Maximum | Stock Options, Repriced                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Exercise price (in USD per share) | $ / shares                 24.44    
Median | Stock Options, Repriced                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Exercise price (in USD per share) | $ / shares                 $ 17.28