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Derivatives - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Dec. 03, 2024
Sep. 30, 2024
Apr. 11, 2024
Feb. 01, 2024
Dec. 05, 2023
Open Forward Foreign Currency Contract [Line Items]                  
Net gain (loss) related to the fair value hedge $ (35) $ 2,471 $ (4,696) $ 2,772          
Collateral pledged 0   0     $ 650      
2028 Notes                  
Open Forward Foreign Currency Contract [Line Items]                  
Net gain (loss) related to the fair value hedge (35) 3,884 (7,444) 4,184          
2029 Notes                  
Open Forward Foreign Currency Contract [Line Items]                  
Net gain (loss) related to the fair value hedge 1 (1,413) 2,748 (1,413)          
Interest Rate Swap                  
Open Forward Foreign Currency Contract [Line Items]                  
Forward currency contracts     (4,697) (2,772)          
Net gain (loss) related to the fair value hedge $ (35) $ 2,471 $ (4,696) $ 2,772          
Interest Rate Swap | 2028 Notes                  
Open Forward Foreign Currency Contract [Line Items]                  
Fixed interest rate (as a percent)             7.31%   7.31%
Basis spread on variable rate (as a percent)             2.835%   3.327%
Notional Amount             $ 225,000   $ 225,000
Interest Rate Swap | 2028 Notes | Tranche one                  
Open Forward Foreign Currency Contract [Line Items]                  
Fixed interest rate (as a percent)                 7.31%
Basis spread on variable rate (as a percent)                 3.327%
Notional Amount                 $ 225,000
Interest Rate Swap | 2028 Notes | Tranche two                  
Open Forward Foreign Currency Contract [Line Items]                  
Fixed interest rate (as a percent)                 7.31%
Basis spread on variable rate (as a percent)                 2.835%
Notional Amount                 $ 225,000
Interest Rate Swap | 2029 Notes | Tranche one                  
Open Forward Foreign Currency Contract [Line Items]                  
Fixed interest rate (as a percent)         6.248%     6.248%  
Basis spread on variable rate (as a percent)         2.444%     2.444%  
Notional Amount               $ 600,000  
Interest Rate Swap | 2029 Notes | Tranche two                  
Open Forward Foreign Currency Contract [Line Items]                  
Fixed interest rate (as a percent)         5.881%     5.881%  
Basis spread on variable rate (as a percent)         2.012%     2.012%  
Notional Amount               $ 150,000