v3.25.2

Portfolio Investments - Schedule of Portfolio Composition (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Sep. 30, 2024
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 3,012,589 | $ 3,144,919
Investments at fair value | $ 2,809,377 | $ 3,021,279
Investment owned, percent of net assets (as a percent) | 190.28% | 203.07%
Northeast |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 1,005,796 | $ 1,033,467
Investments at fair value | $ 891,015 | $ 965,469
Investment owned, percent of net assets (as a percent) | 60.34% | 64.89%
Midwest |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 498,752 | $ 397,640
Investments at fair value | $ 489,418 | $ 390,607
Investment owned, percent of net assets (as a percent) | 33.15% | 26.25%
Southeast |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 471,215 | $ 464,992
Investments at fair value | $ 380,023 | $ 419,669
Investment owned, percent of net assets (as a percent) | 25.74% | 28.21%
International |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 329,690 | $ 343,033
Investments at fair value | $ 344,568 | $ 354,662
Investment owned, percent of net assets (as a percent) | 23.34% | 23.84%
West |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 310,077 | $ 320,407
Investments at fair value | $ 321,504 | $ 314,994
Investment owned, percent of net assets (as a percent) | 21.78% | 21.17%
Southwest |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 217,930 | $ 285,648
Investments at fair value | $ 207,486 | $ 279,653
Investment owned, percent of net assets (as a percent) | 14.05% | 18.80%
South |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 179,129 | $ 241,098
Investments at fair value | $ 175,363 | $ 237,634
Investment owned, percent of net assets (as a percent) | 11.88% | 15.97%
Northwest |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 0 | $ 58,634
Investments at fair value | $ 0 | $ 58,591
Investment owned, percent of net assets (as a percent) | 0.00% | 3.94%
Investment Owned, At Cost | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 100.00% | 100.00%
Investment Owned, At Cost | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 100.00% | 100.00%
Investment Owned, At Cost | Geographic Concentration Risk | Northeast |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 33.39% | 32.86%
Investment Owned, At Cost | Geographic Concentration Risk | Midwest |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 16.56% | 12.64%
Investment Owned, At Cost | Geographic Concentration Risk | Southeast |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 15.64% | 14.79%
Investment Owned, At Cost | Geographic Concentration Risk | International |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 10.94% | 10.91%
Investment Owned, At Cost | Geographic Concentration Risk | West |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 10.29% | 10.19%
Investment Owned, At Cost | Geographic Concentration Risk | Southwest |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 7.23% | 9.08%
Investment Owned, At Cost | Geographic Concentration Risk | South |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 5.95% | 7.67%
Investment Owned, At Cost | Geographic Concentration Risk | Northwest |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 0.00% | 1.86%
Investment Owned, At Fair Value |  |
Schedule of Investments [Line Items] |  |
Investments at fair value | $ 2,809,377 | $ 3,021,279
Investment owned, percent of net assets (as a percent) | 190.28% | 203.07%
Investment Owned, At Fair Value | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 100.00% | 100.00%
Investment Owned, At Fair Value | Geographic Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 100.00% | 100.00%
Investment Owned, At Fair Value | Geographic Concentration Risk | Northeast |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 31.72% | 31.94%
Investment Owned, At Fair Value | Geographic Concentration Risk | Midwest |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 17.42% | 12.93%
Investment Owned, At Fair Value | Geographic Concentration Risk | Southeast |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 13.53% | 13.89%
Investment Owned, At Fair Value | Geographic Concentration Risk | International |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 12.26% | 11.74%
Investment Owned, At Fair Value | Geographic Concentration Risk | West |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 11.44% | 10.43%
Investment Owned, At Fair Value | Geographic Concentration Risk | Southwest |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 7.39% | 9.26%
Investment Owned, At Fair Value | Geographic Concentration Risk | South |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 6.24% | 7.87%
Investment Owned, At Fair Value | Geographic Concentration Risk | Northwest |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 0.00% | 1.94%
Senior secured debt |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 2,445,232 | $ 2,615,066
Investments at fair value | $ 2,343,411 | $ 2,574,937
Investment owned, percent of net assets (as a percent) | 158.72% | 173.06%
Senior secured debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 81.17% | 83.14%
Senior secured debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 83.40% | 85.21%
Debt investments in the JVs |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 165,389 | $ 164,324
Investments at fair value | $ 159,720 | $ 161,552
Investment owned, percent of net assets (as a percent) | 10.82% | 10.86%
Debt investments in the JVs | Investment Owned, At Cost | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 5.49% | 5.23%
Debt investments in the JVs | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 5.69% | 5.35%
Common equity and warrants |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 140,320 | $ 134,452
Investments at fair value | $ 80,011 | $ 86,008
Investment owned, percent of net assets (as a percent) | 5.42% | 5.78%
Common equity and warrants | Investment Owned, At Cost | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 4.66% | 4.28%
Common equity and warrants | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 2.85% | 2.85%
Subordinated debt |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 138,724 | $ 108,068
Investments at fair value | $ 138,122 | $ 109,921
Investment owned, percent of net assets (as a percent) | 9.35% | 7.39%
Subordinated debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 4.60% | 3.44%
Subordinated debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 4.92% | 3.64%
Preferred equity |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 68,133 | $ 68,218
Investments at fair value | $ 73,232 | $ 66,320
Investment owned, percent of net assets (as a percent) | 4.96% | 4.46%
Preferred equity | Investment Owned, At Cost | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 2.26% | 2.17%
Preferred equity | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 2.61% | 2.20%
LLC equity interests of the JVs |  |
Schedule of Investments [Line Items] |  |
Investment owned, at cost | $ 54,791 | $ 54,791
Investments at fair value | $ 14,881 | $ 22,541
Investment owned, percent of net assets (as a percent) | 1.01% | 1.52%
LLC equity interests of the JVs | Investment Owned, At Cost | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 1.82% | 1.74%
LLC equity interests of the JVs | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |
Schedule of Investments [Line Items] |  |
Concentration risk (as a percent) | 0.53% | 0.75%

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