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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
 3 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance $ 2,729,010 $ 1,917,839
Net realized gain (loss) $ 1,468 $ 26,674
Net change in unrealized depreciation/appreciation Gain (Loss) on Investments Gain (Loss) on Investments
Net change in unrealized depreciation/appreciation $ (21,270) $ (21,113)
Purchases, PIK interest, net discount accretion and non-cash exchanges 152,423 613,980
Sales, repayments and non-cash exchanges (345,831) (401,300)
Ending Balance 2,515,800 2,136,080
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. $ (20,456) $ 4,703
Net change in unrealized appreciation (depreciation) reported Net Change in Unrealized Appreciation (Depreciation) Net Change in Unrealized Appreciation (Depreciation)
First lien    
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance $ 2,513,631 $ 1,746,697
Net realized gain (loss) 597 634
Net change in unrealized depreciation/appreciation (12,638) (7,513)
Purchases, PIK interest, net discount accretion and non-cash exchanges 150,963 597,859
Sales, repayments and non-cash exchanges (342,311) (373,901)
Ending Balance 2,310,242 1,963,776
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. (12,483) (2,261)
Second Lien, Subordinated Debt and Equity Investments    
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Beginning Balance 215,379 171,142
Net realized gain (loss) 871 26,040
Net change in unrealized depreciation/appreciation (8,632) (13,600)
Purchases, PIK interest, net discount accretion and non-cash exchanges 1,460 16,121
Sales, repayments and non-cash exchanges (3,520) (27,399)
Ending Balance 205,558 172,304
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. $ (7,973) $ 6,964