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Recent Transactions (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2023
Jul. 31, 2023
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Mar. 31, 2023
Deconsolidation of Subsidiaries [Abstract]              
Gain on deconsolidation of subsidiaries     $ 17,354 $ 16,762 $ 17,354 $ 16,762  
Retained investment     250,393   250,393   $ 304,317
Newly-Formed Subsidiary [Member]              
Asset Acquisition [Abstract]              
Upfront cash payment   $ 14,000          
Acquired in process research and development expense     14,000   14,000    
Newly-Formed Subsidiary [Member] | Maximum [Member]              
Asset Acquisition [Abstract]              
Milestone payment payable   280,000          
SK Biopharmaceuticals Co Ltd [Member] | Proteovant [Member]              
Deconsolidation of Subsidiaries [Abstract]              
Purchase of equity $ 47,500            
VantAI Preferred Financing [Member]              
Deconsolidation of Subsidiaries [Abstract]              
Gain on deconsolidation of subsidiaries     $ 17,400   $ 17,400    
Retained investment   9,000          
VantAI Preferred Financing [Member] | SK, Inc. [Member]              
Deconsolidation of Subsidiaries [Abstract]              
Contributions from issuance of shares   $ 6,000