v3.23.3

Portfolio Investments - Schedule of Financial Instruments Carried at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Schedule of Investments [Line Items] |  |
Investments at fair value | $ 2,892,420 | $ 2,494,111
Cash equivalents | 83,262 | 5,261
Derivative assets | 4,910 | 6,789
Total assets at fair value | 2,980,592 | 2,506,161
Derivative liability | 47,519 | 41,969
Total liabilities at fair value | 47,519 | 41,969
Carrying Value | 1,600,731 | 1,301,043
Fair Value | 1,588,201 | 1,277,105
Senior secured debt |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | 2,501,385 | 2,166,409
Subordinated debt securities, including JV debt instruments |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | 218,390 | 203,453
Preferred equity |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | 86,057 | 79,523
Equity Securities, Common And Warrants, Including JV Investments |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | 86,588 | 44,726
2027 Notes |  |
Schedule of Investments [Line Items] |  |
Carrying Value | 306,412 | 304,052
Fair Value | 301,784 | 294,028
Level 1 |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | 4,317 | 4,053
Cash equivalents | 83,262 | 5,261
Derivative assets | 0 | 0
Total assets at fair value | 87,579 | 9,314
Derivative liability | 0 | 0
Total liabilities at fair value | 0 | 0
Fair Value | 0 | 0
Level 1 | Senior secured debt |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | 0 | 0
Level 1 | Subordinated debt securities, including JV debt instruments |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | 0 | 0
Level 1 | Preferred equity |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | 0 | 0
Level 1 | Equity Securities, Common And Warrants, Including JV Investments |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | 4,317 | 4,053
Level 1 | 2027 Notes |  |
Schedule of Investments [Line Items] |  |
Fair Value | 0 | 0
Level 2 |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | 239,313 | 299,868
Cash equivalents | 0 | 0
Derivative assets | 4,910 | 6,789
Total assets at fair value | 244,223 | 306,657
Derivative liability | 47,519 | 41,969
Total liabilities at fair value | 47,519 | 41,969
Fair Value | 878,201 | 577,105
Level 2 | Senior secured debt |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | 208,694 | 255,803
Level 2 | Subordinated debt securities, including JV debt instruments |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | 28,666 | 44,065
Level 2 | Preferred equity |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | 0 | 0
Level 2 | Equity Securities, Common And Warrants, Including JV Investments |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | 1,953 | 0
Level 2 | 2027 Notes |  |
Schedule of Investments [Line Items] |  |
Fair Value | 301,784 | 294,028
Level 3 |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | 2,619,912 | 2,169,475
Cash equivalents | 0 | 0
Derivative assets | 0 | 0
Total assets at fair value | 2,619,912 | 2,169,475
Derivative liability | 0 | 0
Total liabilities at fair value | 0 | 0
Fair Value | 710,000 | 700,000
Level 3 | Senior secured debt |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | 2,292,691 | 1,910,606
Level 3 | Subordinated debt securities, including JV debt instruments |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | 189,724 | 159,388
Level 3 | Preferred equity |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | 86,057 | 79,523
Level 3 | Equity Securities, Common And Warrants, Including JV Investments |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | 51,440 | 19,958
Level 3 | 2027 Notes |  |
Schedule of Investments [Line Items] |  |
Fair Value | 0 | 0
Fair Value Measured at Net Asset Value Per Share |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | 28,878 | 20,715
Cash equivalents | 0 | 0
Derivative assets | 0 | 0
Total assets at fair value | 28,878 | 20,715
Derivative liability | 0 | 0
Total liabilities at fair value | 0 | 0
Fair Value Measured at Net Asset Value Per Share | Senior secured debt |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | 0 | 0
Fair Value Measured at Net Asset Value Per Share | Subordinated debt securities, including JV debt instruments |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | 0 | 0
Fair Value Measured at Net Asset Value Per Share | Preferred equity |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | 0 | 0
Fair Value Measured at Net Asset Value Per Share | Equity Securities, Common And Warrants, Including JV Investments |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | $ 28,878 | $ 20,715

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