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INVESTMENTS - Summary Investment Holdings (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Sep. 30, 2023
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 790,542 | $ 722,269 | [1]
Fair Value | 791,588 | 704,815 | [1]
South |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 311,428 | 273,181 |
West |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 265,286 | 224,235 |
Midwest |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 153,901 | 145,122 |
Northeast |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 60,973 | 62,277 |
Diversified/Conglomerate Service |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 179,228 | 135,060 |
Diversified/Conglomerate Manufacturing |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 165,273 | 158,061 |
Healthcare, Education, and Childcare |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 160,081 | 146,438 |
Aerospace and Defense |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 120,437 | 97,836 |
Beverage, Food, and Tobacco |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 85,389 | 78,788 |
Automobile |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 27,595 | 27,571 |
Oil and Gas |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 22,343 | 27,830 |
Personal and Non-Durable Consumer Products |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 14,647 | 14,576 |
Machinery |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 6,473 | 6,411 |
Other |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | $ 10,122 | $ 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 | 22.60% | 19.20% |
Investment Owned, At Fair Value | Industry Concentration Risk | Diversified/Conglomerate Manufacturing |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 20.90% | 22.40% |
Investment Owned, At Fair Value | Industry Concentration Risk | Healthcare, Education, and Childcare |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 20.20% | 20.80% |
Investment Owned, At Fair Value | Industry Concentration Risk | Aerospace and Defense |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 15.20% | 13.90% |
Investment Owned, At Fair Value | Industry Concentration Risk | Beverage, Food, and Tobacco |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 10.80% | 11.20% |
Investment Owned, At Fair Value | Industry Concentration Risk | Automobile |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 3.50% | 3.90% |
Investment Owned, At Fair Value | Industry Concentration Risk | Oil and Gas |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 2.80% | 3.90% |
Investment Owned, At Fair Value | Industry Concentration Risk | Personal and Non-Durable Consumer Products |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 1.90% | 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 | 39.30% | 38.80% |
Investment Owned, At Fair Value | Geographic Regions Risk | West |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 33.50% | 31.80% |
Investment Owned, At Fair Value | Geographic Regions Risk | Midwest |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 19.50% | 20.60% |
Investment Owned, At Fair Value | Geographic Regions Risk | Northeast |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 7.70% | 8.80% |
Debt Securities |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 718,850 | $ 659,826 |
Fair Value | $ 704,291 | $ 638,579 |
Debt Securities | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 90.90% | 91.40% |
Debt Securities | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 89.00% | 90.60% |
Secured first lien debt |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 577,545 | $ 529,376 |
Fair Value | $ 563,849 | $ 510,701 |
Secured first lien debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 73.10% | 73.30% |
Secured first lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 71.20% | 72.50% |
Secured second lien debt |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 141,107 | $ 130,252 |
Fair Value | $ 140,409 | $ 127,854 |
Secured second lien debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 17.80% | 18.10% |
Secured second lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 17.80% | 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 | $ 71,692 | $ 62,443 |
Fair Value | $ 87,297 | $ 66,236 |
Equity Securities | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 9.10% | 8.60% |
Equity Securities | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 11.00% | 9.40% |
Preferred Equity |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 44,867 | $ 35,617 |
Fair Value | $ 32,598 | $ 26,855 |
Preferred Equity | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 5.70% | 4.90% |
Preferred Equity | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 4.10% | 3.80% |
Common Equity/ Equivalents |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 26,825 | $ 26,826 |
Fair Value | $ 54,699 | $ 39,381 |
Common Equity/ Equivalents | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 3.40% | 3.70% |
Common Equity/ Equivalents | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 6.90% | 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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