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INVESTMENTS - Schedule of Investment Holdings (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 876,614 | [1] | $ 771,011 | [2]
Fair Value | 859,124 | [1] | 796,260 | [2]
South |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 287,371 |  | 314,010 |
Midwest |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 237,417 |  | 192,897 |
West |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 233,564 |  | 249,082 |
Northeast |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 100,772 |  | 40,271 |
Healthcare, Education, and Childcare |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 273,262 |  | 101,707 |
Diversified/Conglomerate Manufacturing |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 202,466 |  | 160,264 |
Diversified/Conglomerate Service |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 152,042 |  | 179,032 |
Beverage, Food, and Tobacco |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 54,605 |  | 88,327 |
Home and Office Furnishings, Housewares and Durable Consumer Products |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 30,000 |  | 0 |
Automobile |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 27,361 |  | 28,286 |
Machinery |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 26,381 |  | 21,816 |
Personal, Food, and Miscellaneous Services |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 23,700 |  | 0 |
Cargo Transportation |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 20,000 |  | 20,200 |
Oil and Gas |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 17,512 |  | 20,554 |
Personal and Non-Durable Consumer Products |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 13,866 |  | 13,586 |
Printing and Publishing |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 5,809 |  | 4,312 |
Aerospace and Defense |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 1,184 |  | 153,096 |
Other |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | $ 10,936 |  | $ 5,080 |
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 | Healthcare, Education, and Childcare |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 31.80% |  | 12.80% |
Investment Owned, At Fair Value | Industry Concentration Risk | Diversified/Conglomerate Manufacturing |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 23.60% |  | 20.10% |
Investment Owned, At Fair Value | Industry Concentration Risk | Diversified/Conglomerate Service |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 17.70% |  | 22.50% |
Investment Owned, At Fair Value | Industry Concentration Risk | Beverage, Food, and Tobacco |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 6.40% |  | 11.10% |
Investment Owned, At Fair Value | Industry Concentration Risk | Home and Office Furnishings, Housewares and Durable Consumer Products |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 3.50% |  | 0.00% |
Investment Owned, At Fair Value | Industry Concentration Risk | Automobile |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 3.20% |  | 3.60% |
Investment Owned, At Fair Value | Industry Concentration Risk | Machinery |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 3.10% |  | 2.70% |
Investment Owned, At Fair Value | Industry Concentration Risk | Personal, Food, and Miscellaneous Services |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 2.70% |  | 0.00% |
Investment Owned, At Fair Value | Industry Concentration Risk | Cargo Transportation |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 2.30% |  | 2.50% |
Investment Owned, At Fair Value | Industry Concentration Risk | Oil and Gas |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 2.00% |  | 2.60% |
Investment Owned, At Fair Value | Industry Concentration Risk | Personal and Non-Durable Consumer Products |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 1.60% |  | 1.70% |
Investment Owned, At Fair Value | Industry Concentration Risk | Printing and Publishing |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 0.70% |  | 0.50% |
Investment Owned, At Fair Value | Industry Concentration Risk | Aerospace and Defense |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 0.10% |  | 19.20% |
Investment Owned, At Fair Value | Industry Concentration Risk | Other |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 1.30% |  | 0.70% |
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 | 33.50% |  | 39.40% |
Investment Owned, At Fair Value | Geographic Regions Risk | Midwest |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 27.60% |  | 24.20% |
Investment Owned, At Fair Value | Geographic Regions Risk | West |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 27.20% |  | 31.30% |
Investment Owned, At Fair Value | Geographic Regions Risk | Northeast |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 11.70% |  | 5.10% |
Debt Securities |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 796,623 |  | $ 694,625 |
Fair Value | $ 773,246 |  | $ 668,685 |
Debt Securities | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 90.90% |  | 90.10% |
Debt Securities | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 90.00% |  | 84.00% |
Secured first lien debt |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 646,131 |  | $ 580,736 |
Fair Value | $ 622,371 |  | $ 554,937 |
Secured first lien debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 73.70% |  | 75.30% |
Secured first lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 72.40% |  | 69.70% |
Secured second lien debt |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 149,937 |  | $ 113,691 |
Fair Value | $ 150,542 |  | $ 113,716 |
Secured second lien debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 17.10% |  | 14.80% |
Secured second lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 17.50% |  | 14.30% |
Unsecured debt |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 555 |  | $ 198 |
Fair Value | $ 333 |  | $ 32 |
Unsecured debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 0.10% |  | 0.00% |
Unsecured debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 0.10% |  | 0.00% |
Equity Securities |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 79,991 |  | $ 76,386 |
Fair Value | $ 85,878 |  | $ 127,575 |
Equity Securities | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 9.10% |  | 9.90% |
Equity Securities | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 10.00% |  | 16.00% |
Preferred equity |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 37,429 |  | $ 45,017 |
Fair Value | $ 31,214 |  | $ 31,346 |
Preferred equity | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 4.30% |  | 5.80% |
Preferred equity | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 3.60% |  | 3.90% |
Common equity/equivalents |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 42,562 |  | $ 31,369 |
Fair Value | $ 54,664 |  | $ 96,229 |
Common equity/equivalents | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 4.80% |  | 4.10% |
Common equity/equivalents | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 6.40% |  | 12.10% |
[1] | Cumulative gross unrealized depreciation for federal income tax purposes is $59.7 million; cumulative gross unrealized appreciation for federal income tax purposes is $34.1 million. Cumulative net unrealized depreciation is $25.5 million, based on a tax cost of $884.7 million.
[2] | 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

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