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Shareholders' Equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Feb. 08, 2021
Sep. 30, 2024
Sep. 30, 2023
Class of Stock [Line Items]      
Dividend rate 4.875%    
Proceeds from issuance of preferred stock, net $ 293,325    
Stock repurchased (in shares)   1,058,178 1,165,161
Additional shares authorized to be repurchased (in shares)   11,501,005  
Weighted average      
Class of Stock [Line Items]      
Weighted average cost of repurchased stock (in dollars per share)   $ 25.29 $ 26.14
Public Offering      
Class of Stock [Line Items]      
Number of shares issued in transaction (in shares) 12,000,000    
Public offering price (in dollars per share) $ 25.00    
Public Offering | Series A Preferred Stock      
Class of Stock [Line Items]      
Number of shares issued in transaction (in shares) 300,000