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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
 3 Months Ended
Dec. 31, 2024
Dec. 31, 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 $ 1,917,839 $ 1,006,948
Net realized gain (loss) 26,674 (3,089)
Net change in unrealized depreciation/appreciation (21,113) 4,620
Purchases, PIK interest, net discount accretion and non-cash exchanges 613,980 307,198
Sales, repayments and non-cash exchanges (401,300) (106,508)
Ending Balance 2,136,080 1,209,169
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. 4,703 (790)
First lien | Level 3    
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) 634 (4,304)
Net change in unrealized depreciation/appreciation (7,513) 5,478
Purchases, PIK interest, net discount accretion and non-cash exchanges 597,859 288,248
Sales, repayments and non-cash exchanges (373,901) (105,124)
Ending Balance 1,963,776 1,090,464
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. (2,261) (1,085)
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 171,142 100,782
Net realized gain (loss) 26,040 1,215
Net change in unrealized depreciation/appreciation (13,600) (858)
Purchases, PIK interest, net discount accretion and non-cash exchanges 16,121 18,950
Sales, repayments and non-cash exchanges (27,399) (1,384)
Ending Balance 172,304 118,705
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. $ 6,964 $ 295