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Fair Value of Financial Instruments - Reconciliation of Investments Measured at Fair Value Using Significant Unobservable Inputs Level 3 (Details) - Level 3 - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance $ 1,917,839 $ 1,006,948
Net realized gain (loss) 8,355 568
Net change in unrealized depreciation/appreciation (14,003) 13,159
Purchases, PIK interest, net discount accretion and non-cash exchanges 1,099,094 958,408
Sales, repayments and non-cash exchanges (669,456) (388,982)
Ending Balance 2,341,829 1,590,101
Net change in unrealized depreciation reported within the net change in unrealized depreciation on investments in our consolidated statements of operations attributable to our Level 3 assets still held at the reporting date. 6,247 8,503
First lien    
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance 1,746,697 906,166
Net realized gain (loss) (12,997) (5,273)
Net change in unrealized depreciation/appreciation (4,757) 4,009
Purchases, PIK interest, net discount accretion and non-cash exchanges 1,077,943 888,171
Sales, repayments and non-cash exchanges (656,285) (343,867)
Ending Balance 2,150,601 1,449,206
Net change in unrealized depreciation reported within the net change in unrealized depreciation on investments in our consolidated statements of operations attributable to our Level 3 assets still held at the reporting date. (3,778) (2,997)
Second Lien, Subordinated Debt and Equity Investments    
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance 171,142 100,782
Net realized gain (loss) 21,352 5,841
Net change in unrealized depreciation/appreciation (9,246) 9,150
Purchases, PIK interest, net discount accretion and non-cash exchanges 21,151 70,237
Sales, repayments and non-cash exchanges (13,171) (45,115)
Ending Balance 191,228 140,895
Net change in unrealized depreciation reported within the net change in unrealized depreciation on investments in our consolidated statements of operations attributable to our Level 3 assets still held at the reporting date. $ 10,025 $ 11,500