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Share-Based Compensation (Narrative) (Details)
$ in Thousands
1 Months Ended 9 Months Ended
Jan. 11, 2022
shares
Aug. 31, 2021
Dec. 31, 2021
USD ($)
plan
shares
Mar. 31, 2021
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of plans | plan     2  
Unrecognized compensation cost | $     $ 88,800  
Unrecognized compensation expense, period for recognition     2 years 11 months 15 days  
Share-based compensation liabilities | $     $ 2,724 $ 21,636
Subsequent Event        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding stock options canceled (in shares) 331,265,000      
Fair Value, Recurring        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options remeasured (in shares)     390,083 1,281,803
Chief Financial Officer        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of equity awards vested (as a percent)   25.00%    
Accelerated vesting of awards | $     $ 1,300  
Myovant 2016 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common shares reserved for grant (in shares)     2,400,000  
2020 Inducement Equity Award Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common shares reserved for grant (in shares)     100,000