v3.23.3

Portfolio Investments - Portfolio Composition (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 3,044,119 | $ 2,617,754
Investments at fair value | $ 2,892,420 | $ 2,494,111
Investment owned, percent of net assets | 190.82% | 200.24%
Northeast |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 1,012,955 | $ 747,420
Investments at fair value | $ 945,422 | $ 696,368
Investment owned, percent of net assets | 62.37% | 55.90%
International |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 418,595 | $ 301,242
Investments at fair value | $ 414,079 | $ 279,646
Investment owned, percent of net assets | 27.32% | 22.45%
West |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 393,390 | $ 358,306
Investments at fair value | $ 384,055 | $ 345,251
Investment owned, percent of net assets | 25.34% | 27.72%
Southeast |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 375,247 | $ 356,041
Investments at fair value | $ 354,444 | $ 344,567
Investment owned, percent of net assets | 23.38% | 27.66%
Midwest |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 360,506 | $ 373,236
Investments at fair value | $ 350,620 | $ 356,934
Investment owned, percent of net assets | 23.13% | 28.66%
South |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 202,374 | $ 168,819
Investments at fair value | $ 188,541 | $ 166,230
Investment owned, percent of net assets | 12.44% | 13.35%
Southwest |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 153,318 | $ 221,308
Investments at fair value | $ 130,455 | $ 214,984
Investment owned, percent of net assets | 8.61% | 17.26%
Northwest |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 127,734 | $ 91,382
Investments at fair value | $ 124,804 | $ 90,131
Investment owned, percent of net assets | 8.23% | 7.24%
Investment Owned, At Cost | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 100.00% | 100.00%
Investment Owned, At Cost | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 100.00% | 100.00%
Investment Owned, At Cost | Geographic Concentration Risk | Northeast |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 33.27% | 28.55%
Investment Owned, At Cost | Geographic Concentration Risk | International |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 13.75% | 11.51%
Investment Owned, At Cost | Geographic Concentration Risk | West |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 12.92% | 13.69%
Investment Owned, At Cost | Geographic Concentration Risk | Southeast |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 12.33% | 13.60%
Investment Owned, At Cost | Geographic Concentration Risk | Midwest |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 11.84% | 14.26%
Investment Owned, At Cost | Geographic Concentration Risk | South |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 6.65% | 6.45%
Investment Owned, At Cost | Geographic Concentration Risk | Southwest |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 5.04% | 8.45%
Investment Owned, At Cost | Geographic Concentration Risk | Northwest |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 4.20% | 3.49%
Investment Owned, At Fair Value |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | $ 2,892,420 | $ 2,494,111
Investment owned, percent of net assets | 190.82% | 200.24%
Investment Owned, At Fair Value | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 100.00% | 100.00%
Investment Owned, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 100.00% | 100.00%
Investment Owned, At Fair Value | Geographic Concentration Risk | Northeast |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 32.69% | 27.93%
Investment Owned, At Fair Value | Geographic Concentration Risk | International |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 14.32% | 11.21%
Investment Owned, At Fair Value | Geographic Concentration Risk | West |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 13.28% | 13.84%
Investment Owned, At Fair Value | Geographic Concentration Risk | Southeast |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 12.25% | 13.82%
Investment Owned, At Fair Value | Geographic Concentration Risk | Midwest |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 12.12% | 14.31%
Investment Owned, At Fair Value | Geographic Concentration Risk | South |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 6.52% | 6.66%
Investment Owned, At Fair Value | Geographic Concentration Risk | Southwest |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 4.51% | 8.62%
Investment Owned, At Fair Value | Geographic Concentration Risk | Northwest |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 4.31% | 3.61%
Senior secured debt |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 2,594,640 | $ 2,227,245
Investments at fair value | $ 2,501,385 | $ 2,166,409
Investment owned, percent of net assets | 165.01% | 173.93%
Senior secured debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 85.24% | 85.08%
Senior secured debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 86.47% | 86.86%
Debt investments in the JVs |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 162,986 | $ 146,444
Investments at fair value | $ 162,673 | $ 146,533
Investment owned, percent of net assets | 10.73% | 11.77%
Debt investments in the JVs | Investment Owned, At Cost | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 5.35% | 5.59%
Debt investments in the JVs | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 5.62% | 5.88%
Preferred equity |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 99,597 | $ 85,300
Investments at fair value | $ 86,057 | $ 79,523
Investment owned, percent of net assets | 5.68% | 6.38%
Preferred equity | Investment Owned, At Cost | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 3.27% | 3.26%
Preferred equity | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 2.98% | 3.19%
Common equity and warrants |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 72,261 | $ 42,296
Investments at fair value | $ 57,710 | $ 24,011
Investment owned, percent of net assets | 3.81% | 1.93%
Common equity and warrants | Investment Owned, At Cost | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 2.37% | 1.62%
Common equity and warrants | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 2.00% | 0.96%
Subordinated debt |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 59,844 | $ 67,147
Investments at fair value | $ 55,717 | $ 56,920
Investment owned, percent of net assets | 3.68% | 4.57%
Subordinated debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 1.97% | 2.57%
Subordinated debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 1.93% | 2.28%
LLC equity interests of the JVs |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 54,791 | $ 49,322
Investments at fair value | $ 28,878 | $ 20,715
Investment owned, percent of net assets | 1.91% | 1.66%
LLC equity interests of the JVs | Investment Owned, At Cost | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 1.80% | 1.88%
LLC equity interests of the JVs | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk | 1.00% | 0.83%

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