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INVESTMENTS - Summary Investment Holdings (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Sep. 30, 2022
Summary of Investment Holdings [Line Items] |  |
Cost | $ 696,031 | $ 656,053
Fair Value | $ 678,759 | $ 649,615
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 | $ 303,139 | $ 326,524
South | Investment Owned, At Fair Value | Geographic Regions Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 44.70% | 50.30%
West |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 194,913 | $ 169,415
West | Investment Owned, At Fair Value | Geographic Regions Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 28.70% | 26.10%
Midwest |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 144,399 | $ 118,191
Midwest | Investment Owned, At Fair Value | Geographic Regions Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 21.30% | 18.20%
Northeast |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 36,308 | $ 35,485
Northeast | Investment Owned, At Fair Value | Geographic Regions Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 5.30% | 5.40%
Diversified/Conglomerate Service |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 158,695 | $ 148,907
Diversified/Conglomerate Service | Investment Owned, At Fair Value | Industry Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 23.40% | 22.90%
Diversified/Conglomerate Manufacturing |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 142,091 | $ 114,105
Diversified/Conglomerate Manufacturing | Investment Owned, At Fair Value | Industry Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 20.90% | 17.60%
Healthcare, Education, and Childcare |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 133,509 | $ 136,401
Healthcare, Education, and Childcare | Investment Owned, At Fair Value | Industry Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 19.70% | 21.00%
Aerospace and Defense |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 86,384 | $ 88,649
Aerospace and Defense | Investment Owned, At Fair Value | Industry Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 12.70% | 13.60%
Beverage, Food, and Tobacco |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 70,119 | $ 64,283
Beverage, Food, and Tobacco | Investment Owned, At Fair Value | Industry Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 10.30% | 9.90%
Oil and Gas |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 23,993 | $ 25,373
Oil and Gas | Investment Owned, At Fair Value | Industry Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 3.50% | 3.90%
Automobile |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 19,941 | $ 20,144
Automobile | Investment Owned, At Fair Value | Industry Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 3.00% | 3.10%
Personal and Non-Durable Consumer Products |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 17,123 | $ 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 | 2.50% | 2.90%
Machinery |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 10,896 | $ 9,562
Machinery | Investment Owned, At Fair Value | Industry Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 1.60% | 1.50%
Telecommunications |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 7,464 | $ 10,088
Telecommunications | Investment Owned, At Fair Value | Industry Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 1.10% | 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 | $ 8,544 | $ 5,542
Other | Investment Owned, At Fair Value | Industry Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 1.30% | 0.80%
Debt Securities |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 636,473 | $ 595,048
Fair Value | $ 618,757 | $ 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 | 91.10% | 89.20%
Secured first lien debt |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 513,175 | $ 475,806
Fair Value | $ 498,947 | $ 463,858
Secured first lien debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 73.70% | 72.50%
Secured first lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 73.50% | 71.40%
Secured second lien debt |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 120,684 | $ 118,949
Fair Value | $ 117,438 | $ 115,928
Secured second lien debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 17.30% | 18.20%
Secured second lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 17.30% | 17.80%
Unsecured debt |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 2,614 | $ 293
Fair Value | $ 2,372 | $ 55
Unsecured debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 0.40% | 0.00%
Unsecured debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 0.30% | 0.00%
Equity Securities |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 59,558 | $ 61,005
Fair Value | $ 60,002 | $ 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 | 8.90% | 10.80%
Preferred Equity |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 34,732 | $ 34,505
Fair Value | $ 28,298 | $ 27,046
Preferred Equity | Investment Owned, At Cost | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 5.00% | 5.30%
Preferred Equity | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 4.20% | 4.20%
Common Equity/ Equivalents |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 24,826 | $ 26,500
Fair Value | $ 31,704 | $ 42,728
Common Equity/ Equivalents | Investment Owned, At Cost | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 3.60% | 4.00%
Common Equity/ Equivalents | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 4.70% | 6.60%

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