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INVESTMENTS - Schedule of Investment Holdings (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Sep. 30, 2024 | Apr. 30, 2025
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 777,851 | $ 771,011 | [1] |
Fair Value | 751,260 | 796,260 | [1] |
South |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 247,674 | 314,010 |  |
Midwest |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 229,178 | 192,897 |  |
West |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 218,612 | 249,082 |  |
Northeast |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 55,796 | 40,271 |  |
Healthcare, Education, and Childcare |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 272,883 | 101,707 |  |
Diversified/Conglomerate Manufacturing |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 174,470 | 160,264 |  |
Diversified/Conglomerate Service |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 110,727 | 179,032 |  |
Beverage, Food, and Tobacco |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 56,001 | 88,327 |  |
Automobile |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 27,147 | 28,286 |  |
Machinery |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 25,831 | 21,816 |  |
Cargo Transportation |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 20,000 | 20,200 |  |
Oil and Gas |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 18,463 | 20,554 |  |
Aerospace and Defense |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 16,975 | 153,096 |  |
Personal and Non-Durable Consumer Products |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 12,743 | 13,586 |  |
Printing and Publishing |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | 5,445 | 4,312 |  |
Other |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair Value | $ 10,575 | $ 5,080 |  |
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 | Healthcare, Education, and Childcare |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 36.30% | 12.80% |  |
Investment Owned, At Fair Value | Industry Concentration Risk | Diversified/Conglomerate Manufacturing |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 23.20% | 20.10% |  |
Investment Owned, At Fair Value | Industry Concentration Risk | Diversified/Conglomerate Service |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 14.70% | 22.50% |  |
Investment Owned, At Fair Value | Industry Concentration Risk | Beverage, Food, and Tobacco |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 7.50% | 11.10% |  |
Investment Owned, At Fair Value | Industry Concentration Risk | Automobile |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 3.60% | 3.60% |  |
Investment Owned, At Fair Value | Industry Concentration Risk | Machinery |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 3.40% | 2.70% |  |
Investment Owned, At Fair Value | Industry Concentration Risk | Cargo Transportation |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 2.70% | 2.50% |  |
Investment Owned, At Fair Value | Industry Concentration Risk | Oil and Gas |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 2.50% | 2.60% |  |
Investment Owned, At Fair Value | Industry Concentration Risk | Aerospace and Defense |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 2.30% | 19.20% |  |
Investment Owned, At Fair Value | Industry Concentration Risk | Personal and Non-Durable Consumer Products |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 1.70% | 1.70% |  |
Investment Owned, At Fair Value | Industry Concentration Risk | Printing and Publishing |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 0.70% | 0.50% |  |
Investment Owned, At Fair Value | Industry Concentration Risk | Other |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 1.40% | 0.70% |  |
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 | 33.00% | 39.40% |  |
Investment Owned, At Fair Value | Geographic Regions Risk | Midwest |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 30.50% | 24.20% |  |
Investment Owned, At Fair Value | Geographic Regions Risk | West |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 29.10% | 31.30% |  |
Investment Owned, At Fair Value | Geographic Regions Risk | Northeast |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 7.40% | 5.10% |  |
Debt Securities |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 700,121 | $ 694,625 |  |
Fair Value | $ 673,802 | $ 668,685 |  |
Debt Securities | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 90.00% | 90.10% |  |
Debt Securities | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 89.70% | 84.00% |  |
Secured first lien debt |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 555,347 | $ 580,736 |  |
Fair Value | $ 529,149 | $ 554,937 |  |
Secured first lien debt | Eegee Acquisition Corporation |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost |  |  |  | $ 12,800
Secured first lien debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 71.40% | 75.30% |  |
Secured first lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 70.40% | 69.70% |  |
Secured second lien debt |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 144,231 | $ 113,691 |  |
Fair Value | $ 144,299 | $ 113,716 |  |
Secured second lien debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 18.50% | 14.80% |  |
Secured second lien debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 19.20% | 14.30% |  |
Unsecured debt |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 543 | $ 198 |  |
Fair Value | $ 354 | $ 32 |  |
Unsecured debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 0.10% | 0.00% |  |
Unsecured debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 0.10% | 0.00% |  |
Equity Securities |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 77,730 | $ 76,386 |  |
Fair Value | $ 77,458 | $ 127,575 |  |
Equity Securities | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 10.00% | 9.90% |  |
Equity Securities | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 10.30% | 16.00% |  |
Preferred Equity |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 37,279 | $ 45,017 |  |
Fair Value | $ 25,717 | $ 31,346 |  |
Preferred Equity | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 4.80% | 5.80% |  |
Preferred Equity | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 3.40% | 3.90% |  |
Common Equity/ Equivalents |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 40,451 | $ 31,369 |  |
Fair Value | $ 51,741 | $ 96,229 |  |
Common Equity/ Equivalents | Eegee Acquisition Corporation |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost |  |  |  | $ 8,500
Common Equity/ Equivalents | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 5.20% | 4.10% |  |
Common Equity/ Equivalents | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration Risk, Percentage | 6.90% | 12.10% |  |
[1] | Cumulative gross unrealized depreciation for federal income tax purposes is $66.1 million; cumulative gross unrealized appreciation for federal income tax purposes is $85.8 million. Cumulative net unrealized appreciation is $19.7 million, based on a tax cost of $776.5 million.

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