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INVESTMENTS - Summary Investment Holdings (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Sep. 30, 2023
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 753,263 | $ 722,269 | [1]
Fair Value | 757,745 | 704,815 | [1]
South |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 289,191 | 273,181 |
West |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 248,443 | 224,235 |
Midwest |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 175,923 | 145,122 |
Northeast |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 44,188 | 62,277 |
Diversified/Conglomerate Service |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 180,136 | 135,060 |
Diversified/Conglomerate Manufacturing |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 164,251 | 158,061 |
Aerospace and Defense |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 128,782 | 97,836 |
Healthcare, Education, and Childcare |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 93,853 | 146,438 |
Beverage, Food, and Tobacco |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 90,843 | 78,788 |
Automobile |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 28,040 | 27,571 |
Oil and Gas |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 21,600 | 27,830 |
Cargo Transportation |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 20,000 | 0 |
Personal and Non-Durable Consumer Products |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 13,617 | 14,576 |
Machinery |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 6,389 | 6,411 |
Other |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | $ 10,234 | $ 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 | 23.80% | 19.20% |
Investment Owned, At Fair Value | Industry Concentration Risk | Diversified/Conglomerate Manufacturing |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 21.70% | 22.40% |
Investment Owned, At Fair Value | Industry Concentration Risk | Aerospace and Defense |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 17.00% | 13.90% |
Investment Owned, At Fair Value | Industry Concentration Risk | Healthcare, Education, and Childcare |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 12.40% | 20.80% |
Investment Owned, At Fair Value | Industry Concentration Risk | Beverage, Food, and Tobacco |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 12.00% | 11.20% |
Investment Owned, At Fair Value | Industry Concentration Risk | Automobile |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 3.70% | 3.90% |
Investment Owned, At Fair Value | Industry Concentration Risk | Oil and Gas |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 2.90% | 3.90% |
Investment Owned, At Fair Value | Industry Concentration Risk | Cargo Transportation |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 2.60% | 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 | 1.80% | 2.10% |
Investment Owned, At Fair Value | Industry Concentration Risk | Machinery |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 0.80% | 0.90% |
Investment Owned, At Fair Value | Industry Concentration Risk | Other |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 1.30% | 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 | 38.20% | 38.80% |
Investment Owned, At Fair Value | Geographic Regions Risk | West |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 32.80% | 31.80% |
Investment Owned, At Fair Value | Geographic Regions Risk | Midwest |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 23.20% | 20.60% |
Investment Owned, At Fair Value | Geographic Regions Risk | Northeast |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 5.80% | 8.80% |
Debt Securities |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 680,862 | $ 659,826 |
Fair Value | $ 660,191 | $ 638,579 |
Debt Securities | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 90.40% | 91.40% |
Debt Securities | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 87.10% | 90.60% |
Secured first lien debt |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 562,760 | $ 529,376 |
Fair Value | $ 542,283 | $ 510,701 |
Secured first lien debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 74.70% | 73.30% |
Secured first lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 71.60% | 72.50% |
Secured second lien debt |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 117,904 | $ 130,252 |
Fair Value | $ 117,875 | $ 127,854 |
Secured second lien debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 15.70% | 18.10% |
Secured second lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 15.50% | 18.10% |
Unsecured debt |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 198 | $ 198 |
Fair Value | $ 33 | $ 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 | $ 72,401 | $ 62,443 |
Fair Value | $ 97,554 | $ 66,236 |
Equity Securities | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 9.60% | 8.60% |
Equity Securities | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 12.90% | 9.40% |
Preferred Equity |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 44,867 | $ 35,617 |
Fair Value | $ 32,965 | $ 26,855 |
Preferred Equity | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 6.00% | 4.90% |
Preferred Equity | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 4.40% | 3.80% |
Common Equity/ Equivalents |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 27,534 | $ 26,826 |
Fair Value | $ 64,589 | $ 39,381 |
Common Equity/ Equivalents | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 3.60% | 3.70% |
Common Equity/ Equivalents | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 8.50% | 5.60% |
[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.

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