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INVESTMENTS - Summary Investment Holdings (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 771,011 | [1] | $ 722,269 | [2]
Fair Value | 796,260 | [1] | 704,815 | [2]
South |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 314,010 |  | 273,181 |
West |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 249,082 |  | 224,235 |
Midwest |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 192,897 |  | 145,122 |
Northeast |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 40,271 |  | 62,277 |
Diversified/Conglomerate Service |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 179,032 |  | 135,060 |
Diversified/Conglomerate Manufacturing |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 160,264 |  | 158,061 |
Aerospace and Defense |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 153,096 |  | 97,836 |
Healthcare, Education, and Childcare |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 101,707 |  | 146,438 |
Beverage, Food, and Tobacco |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 88,327 |  | 78,788 |
Automobile |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 28,286 |  | 27,571 |
Machinery |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 21,816 |  | 6,411 |
Oil and Gas |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 20,554 |  | 27,830 |
Cargo Transportation |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 20,200 |  | 0 |
Personal and Non-Durable Consumer Products |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 13,586 |  | 14,576 |
Other |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | $ 9,392 |  | $ 12,244 |
Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 100.00% |  | 100.00% |
Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 100.00% |  | 100.00% |
Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 100.00% |  | 100.00% |
Investment Owned, At Fair Value | Industry Concentration Risk | Diversified/Conglomerate Service |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 22.50% |  | 19.20% |
Investment Owned, At Fair Value | Industry Concentration Risk | Diversified/Conglomerate Manufacturing |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 20.10% |  | 22.40% |
Investment Owned, At Fair Value | Industry Concentration Risk | Aerospace and Defense |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 19.20% |  | 13.90% |
Investment Owned, At Fair Value | Industry Concentration Risk | Healthcare, Education, and Childcare |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 12.80% |  | 20.80% |
Investment Owned, At Fair Value | Industry Concentration Risk | Beverage, Food, and Tobacco |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 11.10% |  | 11.20% |
Investment Owned, At Fair Value | Industry Concentration Risk | Automobile |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 3.60% |  | 3.90% |
Investment Owned, At Fair Value | Industry Concentration Risk | Machinery |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 2.70% |  | 0.90% |
Investment Owned, At Fair Value | Industry Concentration Risk | Oil and Gas |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 2.60% |  | 3.90% |
Investment Owned, At Fair Value | Industry Concentration Risk | Cargo Transportation |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 2.50% |  | 0.00% |
Investment Owned, At Fair Value | Industry Concentration Risk | Personal and Non-Durable Consumer Products |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 1.70% |  | 2.10% |
Investment Owned, At Fair Value | Industry Concentration Risk | Other |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 1.20% |  | 1.70% |
Investment Owned, At Fair Value | Geographic Regions Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 100.00% |  | 100.00% |
Investment Owned, At Fair Value | Geographic Regions Risk | South |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 39.40% |  | 38.80% |
Investment Owned, At Fair Value | Geographic Regions Risk | West |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 31.30% |  | 31.80% |
Investment Owned, At Fair Value | Geographic Regions Risk | Midwest |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 24.20% |  | 20.60% |
Investment Owned, At Fair Value | Geographic Regions Risk | Northeast |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 5.10% |  | 8.80% |
Debt Securities |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 694,625 |  | $ 659,826 |
Fair Value | $ 668,685 |  | $ 638,579 |
Debt Securities | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 90.10% |  | 91.40% |
Debt Securities | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 84.00% |  | 90.60% |
Secured first lien debt |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 580,736 |  | $ 529,376 |
Fair Value | $ 554,937 |  | $ 510,701 |
Secured first lien debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 75.30% |  | 73.30% |
Secured first lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 69.70% |  | 72.50% |
Secured second lien debt |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 113,691 |  | $ 130,252 |
Fair Value | $ 113,716 |  | $ 127,854 |
Secured second lien debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 14.80% |  | 18.10% |
Secured second lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 14.30% |  | 18.10% |
Unsecured debt |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 198 |  | $ 198 |
Fair Value | $ 32 |  | $ 24 |
Unsecured debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 0.00% |  | 0.00% |
Unsecured debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 0.00% |  | 0.00% |
Equity Securities |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 76,386 |  | $ 62,443 |
Fair Value | $ 127,575 |  | $ 66,236 |
Equity Securities | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 9.90% |  | 8.60% |
Equity Securities | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 16.00% |  | 9.40% |
Preferred equity |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 45,017 |  | $ 35,617 |
Fair Value | $ 31,346 |  | $ 26,855 |
Preferred equity | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 5.80% |  | 4.90% |
Preferred equity | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 3.90% |  | 3.80% |
Common equity/equivalents |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 31,369 |  | $ 26,826 |
Fair Value | $ 96,229 |  | $ 39,381 |
Common equity/equivalents | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 4.10% |  | 3.70% |
Common equity/equivalents | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 12.10% |  | 5.60% |
[1] | Cumulative gross unrealized depreciation for federal income tax purposes is $66.1 million; cumulative gross unrealized appreciation for federal income tax purposes is $85.8 million. Cumulative net unrealized appreciation is $19.7 million, based on a tax cost of $776.5 million.
[2] | Cumulative gross unrealized depreciation for federal income tax purposes is $56.9 million; cumulative gross unrealized appreciation for federal income tax purposes is $33.7 million. Cumulative net unrealized depreciation is $23.2 million, based on a tax cost of $728.0 million.

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