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INVESTMENTS - Summary Investment Holdings (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 759,634 | $ 722,269 | [1]
Fair Value | $ 749,985 | $ 704,815 | [1]
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 | $ 289,458 | $ 273,181 |
South | Investment Owned, At Fair Value | Geographic Regions Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 38.60% | 38.80% |
West |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | $ 242,651 | $ 224,235 |
West | Investment Owned, At Fair Value | Geographic Regions Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 32.40% | 31.80% |
Midwest |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | $ 154,155 | $ 145,122 |
Midwest | Investment Owned, At Fair Value | Geographic Regions Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 20.50% | 20.60% |
Northeast |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | $ 63,721 | $ 62,277 |
Northeast | Investment Owned, At Fair Value | Geographic Regions Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 8.50% | 8.80% |
Diversified/Conglomerate Service |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | $ 163,817 | $ 135,060 |
Diversified/Conglomerate Service | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 21.80% | 19.20% |
Healthcare, Education, and Childcare |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | $ 159,410 | $ 146,438 |
Healthcare, Education, and Childcare | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 21.30% | 20.80% |
Diversified/Conglomerate Manufacturing |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | $ 158,612 | $ 158,061 |
Diversified/Conglomerate Manufacturing | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 21.10% | 22.40% |
Aerospace and Defense |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | $ 105,806 | $ 97,836 |
Aerospace and Defense | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 14.10% | 13.90% |
Beverage, Food, and Tobacco |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | $ 80,492 | $ 78,788 |
Beverage, Food, and Tobacco | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 10.70% | 11.20% |
Oil and Gas |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | $ 23,662 | $ 27,830 |
Oil and Gas | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 3.20% | 3.90% |
Automobile |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | $ 27,793 | $ 27,571 |
Automobile | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 3.70% | 3.90% |
Personal and Non-Durable Consumer Products |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | $ 14,162 | $ 14,576 |
Personal and Non-Durable Consumer Products | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 1.90% | 2.10% |
Machinery |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | $ 6,216 | $ 6,411 |
Machinery | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 0.90% | 0.90% |
Other |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | $ 10,015 | $ 12,244 |
Other | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 1.30% | 1.70% |
Debt Securities |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 688,192 | $ 659,826 |
Fair Value | $ 673,196 | $ 638,579 |
Debt Securities | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 90.60% | 91.40% |
Debt Securities | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 89.80% | 90.60% |
Secured first lien debt |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 558,281 | $ 529,376 |
Fair Value | $ 546,602 | $ 510,701 |
Secured first lien debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 73.50% | 73.30% |
Secured first lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 72.90% | 72.50% |
Secured second lien debt |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 129,713 | $ 130,252 |
Fair Value | $ 126,571 | $ 127,854 |
Secured second lien debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 17.10% | 18.10% |
Secured second lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 16.90% | 18.10% |
Unsecured debt |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 198 | $ 198 |
Fair Value | $ 23 | $ 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 | $ 71,442 | $ 62,443 |
Fair Value | $ 76,789 | $ 66,236 |
Equity Securities | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 9.40% | 8.60% |
Equity Securities | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 10.20% | 9.40% |
Preferred Equity |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 44,617 | $ 35,617 |
Fair Value | $ 29,722 | $ 26,855 |
Preferred Equity | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 5.90% | 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 | $ 26,825 | $ 26,826 |
Fair Value | $ 47,067 | $ 39,381 |
Common Equity/ Equivalents | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 3.50% | 3.70% |
Common Equity/ Equivalents | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 6.30% | 5.60% |
[1] | Investment was exited subsequent to December 31, 2023. Refer to Note 12 – Subsequent Events in the accompanying Notes to the Consolidated Financial Statements for additional information.

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