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Fair Value of Financial Instruments - Reconciliation of Liabilities Measured at Fair Value Using Significant Unobservable Inputs Level 3 (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Net realized (gain) loss $ 1,457 $ 26,674
Level 3 | Long-Term Credit Facility    
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance 683,837 443,880
Net change in unrealized (depreciation) appreciation included in earnings 22 (89)
Borrowings 27,000 165,000
Repayments (222,000)
Ending Balance $ 488,859 $ 608,791