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Fair Value of Financial Instruments - Reconciliation of Investments Measured at Fair Value Using Significant Unobservable Inputs Level 3 (Details) - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Net change in unrealized depreciation/appreciation Net change in unrealized appreciation (depreciation) on investments Net change in unrealized appreciation (depreciation) on investments
Net change in unrealized appreciation (depreciation) reported Net change in unrealized appreciation (depreciation) on investments Net change in unrealized appreciation (depreciation) on investments
Level 3    
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance $ 1,006,948 $ 1,104,927
Net realized gain (loss) 568 (14,065)
Net change in unrealized depreciation/appreciation 13,159 (11,051)
Purchases, PIK interest, net discount accretion and non-cash exchanges 958,408 226,686
Sales, repayments and non-cash exchanges (388,982) (258,075)
Ending Balance 1,590,101 1,048,422
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. 8,503 (22,725)
First lien | Level 3    
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance 906,166 1,009,642
Net realized gain (loss) (5,273) (16,268)
Net change in unrealized depreciation/appreciation 4,009 1,245
Purchases, PIK interest, net discount accretion and non-cash exchanges 888,171 208,709
Sales, repayments and non-cash exchanges (343,867) (253,084)
Ending Balance 1,449,206 950,244
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. (2,997) (13,491)
Second Lien, Subordinated Debt and Equity Investments | Level 3    
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance 100,782 95,285
Net realized gain (loss) 5,841 2,203
Net change in unrealized depreciation/appreciation 9,150 (12,296)
Purchases, PIK interest, net discount accretion and non-cash exchanges 70,237 17,977
Sales, repayments and non-cash exchanges (45,115) (4,991)
Ending Balance 140,895 98,178
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. $ 11,500 $ (9,234)