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INVESTMENTS - Summary Investment Holdings (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 | Sep. 30, 2022
Summary of Investment Holdings [Line Items] |  |
Cost | $ 735,182 | $ 656,053
Fair Value | $ 715,324 | $ 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 | $ 290,432 | $ 326,524
South | Investment Owned, At Fair Value | Geographic Regions Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 40.60% | 50.30%
West |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 220,602 | $ 169,415
West | Investment Owned, At Fair Value | Geographic Regions Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 30.80% | 26.10%
Midwest |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 146,324 | $ 118,191
Midwest | Investment Owned, At Fair Value | Geographic Regions Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 20.50% | 18.20%
Northeast |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 57,966 | $ 35,485
Northeast | Investment Owned, At Fair Value | Geographic Regions Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 8.10% | 5.40%
Diversified/Conglomerate Service |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 164,261 | $ 148,907
Diversified/Conglomerate Service | Investment Owned, At Fair Value | Industry Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 23.00% | 22.90%
Diversified/Conglomerate Manufacturing |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 160,904 | $ 114,105
Diversified/Conglomerate Manufacturing | Investment Owned, At Fair Value | Industry Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 22.50% | 17.60%
Healthcare, Education, and Childcare |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 145,011 | $ 136,401
Healthcare, Education, and Childcare | Investment Owned, At Fair Value | Industry Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 20.30% | 21.00%
Aerospace and Defense |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 87,932 | $ 88,649
Aerospace and Defense | Investment Owned, At Fair Value | Industry Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 12.30% | 13.60%
Beverage, Food, and Tobacco |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 74,641 | $ 64,283
Beverage, Food, and Tobacco | Investment Owned, At Fair Value | Industry Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 10.40% | 9.90%
Oil and Gas |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 26,887 | $ 25,373
Oil and Gas | Investment Owned, At Fair Value | Industry Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 3.80% | 3.90%
Automobile |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 22,191 | $ 20,144
Automobile | Investment Owned, At Fair Value | Industry Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 3.10% | 3.10%
Personal and Non-Durable Consumer Products |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 14,742 | $ 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 | $ 6,676 | $ 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 | $ 5,976 | $ 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 | $ 6,103 | $ 5,542
Other | Investment Owned, At Fair Value | Industry Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 0.80% | 0.80%
Debt Securities |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 672,739 | $ 595,048
Fair Value | $ 653,305 | $ 579,841
Debt Securities | Investment Owned, At Cost | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 91.50% | 90.70%
Debt Securities | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 91.30% | 89.20%
Secured first lien debt |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 549,860 | $ 475,806
Fair Value | $ 533,237 | $ 463,858
Secured first lien debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 74.80% | 72.50%
Secured first lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 74.50% | 71.40%
Secured second lien debt |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 122,681 | $ 118,949
Fair Value | $ 120,036 | $ 115,928
Secured second lien debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 16.70% | 18.20%
Secured second lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 16.80% | 17.80%
Unsecured debt |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 198 | $ 293
Fair Value | $ 32 | $ 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 | $ 62,019 | $ 69,774
Equity Securities | Investment Owned, At Cost | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 8.50% | 9.30%
Equity Securities | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 8.70% | 10.80%
Preferred Equity |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 35,617 | $ 34,505
Fair Value | $ 27,991 | $ 27,046
Preferred Equity | Investment Owned, At Cost | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 4.80% | 5.30%
Preferred Equity | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |
Summary of Investment Holdings [Line Items] |  |
Concentration risk, percentage | 3.90% | 4.20%
Common Equity/ Equivalents |  |
Summary of Investment Holdings [Line Items] |  |
Cost | $ 26,826 | $ 26,500
Fair Value | $ 34,028 | $ 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 | 4.80% | 6.60%

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