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Share-Based Compensation (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Apr. 01, 2020
Jun. 30, 2020
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost   $ 69.3  
Unrecognized compensation expense, period for recognition   3 years  
Performance Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based payment arrangement, expensed and capitalized, amount   $ 0.6  
Myovant 2016 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares reserved for grant (in shares)   1.2 4.5
Common shares reserved for grant, annual percentage increase     4.00%
Increase in common shares reserved for grant (in shares) 3.6