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Financial Royalty Assets - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financial royalty asset, net $ 14,184,425 $ 14,332,596
Unapproved financial assets held at costs 533,800  
Otilimab    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-cash impairment charges 160,100  
Gantenerumab    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-cash impairment charges 273,600  
Roche’s    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-cash impairment charges $ 182,100