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INVESTMENTS - Summary Investment Holdings (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 722,269 | [1] | $ 656,053 | [2]
Fair Value | $ 704,815 | [1] | $ 649,615 | [2]
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 | Geographic Regions Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 100.00% |  | 100.00% |
South |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | $ 273,181 |  | $ 326,524 |
South | Investment Owned, At Fair Value | Geographic Regions Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 38.80% |  | 50.30% |
West |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | $ 224,235 |  | $ 169,415 |
West | Investment Owned, At Fair Value | Geographic Regions Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 31.80% |  | 26.10% |
Midwest |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | $ 145,122 |  | $ 118,191 |
Midwest | Investment Owned, At Fair Value | Geographic Regions Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 20.60% |  | 18.20% |
Northeast |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | $ 62,277 |  | $ 35,485 |
Northeast | Investment Owned, At Fair Value | Geographic Regions Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 8.80% |  | 5.40% |
Diversified/Conglomerate Manufacturing |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | $ 158,061 |  | $ 114,105 |
Diversified/Conglomerate Manufacturing | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 22.40% |  | 17.60% |
Healthcare, Education, and Childcare |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | $ 146,438 |  | $ 136,401 |
Healthcare, Education, and Childcare | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 20.80% |  | 21.00% |
Diversified/Conglomerate Service |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | $ 135,060 |  | $ 148,907 |
Diversified/Conglomerate Service | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 19.20% |  | 22.90% |
Aerospace and Defense |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | $ 97,836 |  | $ 88,649 |
Aerospace and Defense | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 13.90% |  | 13.60% |
Beverage, Food, and Tobacco |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | $ 78,788 |  | $ 64,283 |
Beverage, Food, and Tobacco | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 11.20% |  | 9.90% |
Oil and Gas |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | $ 27,830 |  | $ 25,373 |
Oil and Gas | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 3.90% |  | 3.90% |
Automobile |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | $ 27,571 |  | $ 20,144 |
Automobile | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 3.90% |  | 3.10% |
Personal and Non-Durable Consumer Products |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | $ 14,576 |  | $ 18,583 |
Personal and Non-Durable Consumer Products | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 2.10% |  | 2.90% |
Machinery |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | $ 6,411 |  | $ 9,562 |
Machinery | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 0.90% |  | 1.50% |
Telecommunications |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | $ 5,868 |  | $ 10,088 |
Telecommunications | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 0.80% |  | 1.60% |
Textiles and Leather |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | $ 0 |  | $ 7,978 |
Textiles and Leather | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 0.00% |  | 1.20% |
Other |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | $ 6,376 |  | $ 5,542 |
Other | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 0.90% |  | 0.80% |
Debt Securities |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 659,826 |  | $ 595,048 |
Fair Value | $ 638,579 |  | $ 579,841 |
Debt Securities | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 91.40% |  | 90.70% |
Debt Securities | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 90.60% |  | 89.20% |
Secured first lien debt |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 529,376 |  | $ 475,806 |
Fair Value | $ 510,701 |  | $ 463,858 |
Secured first lien debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 73.30% |  | 72.50% |
Secured first lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 72.50% |  | 71.40% |
Secured second lien debt |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 130,252 |  | $ 118,949 |
Fair Value | $ 127,854 |  | $ 115,928 |
Secured second lien debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 18.10% |  | 18.20% |
Secured second lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 18.10% |  | 17.80% |
Unsecured debt |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 198 |  | $ 293 |
Fair Value | $ 24 |  | $ 55 |
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 | $ 62,443 |  | $ 61,005 |
Fair Value | $ 66,236 |  | $ 69,774 |
Equity Securities | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 8.60% |  | 9.30% |
Equity Securities | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 9.40% |  | 10.80% |
Preferred equity |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 35,617 |  | $ 34,505 |
Fair Value | $ 26,855 |  | $ 27,046 |
Preferred equity | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 4.90% |  | 5.30% |
Preferred equity | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 3.80% |  | 4.20% |
Common equity/equivalents |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 26,826 |  | $ 26,500 |
Fair Value | $ 39,381 |  | $ 42,728 |
Common equity/equivalents | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 3.70% |  | 4.00% |
Common equity/equivalents | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 5.60% |  | 6.60% |
[1] | 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.
[2] | Cumulative gross unrealized depreciation for federal income tax purposes is $52.3 million; cumulative gross unrealized appreciation for federal income tax purposes is $35.2 million. Cumulative net unrealized depreciation is $17.1 million, based on a tax cost of $666.7 million.

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