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INVESTMENTS - Schedule of Investment Concentrations (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Mar. 31, 2024
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 1,021,741 | $ 854,290 | [1]
Fair Value | 1,072,230 | 920,504 | [1]
Northeast |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 305,374 | 207,870 |
South |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 295,954 | 346,838 |
Midwest |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 222,587 | 141,925 |
West |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 221,135 | 223,871 |
Canada |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 27,180 | 0 |
Diversified/Conglomerate Services |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 167,188 | 264,535 |
Home and Office Furnishings, Housewares, and Durable Consumer Products |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 164,017 | 160,038 |
Hotels, Motels, Inns, and Gaming |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 116,534 | 77,366 |
Aerospace and Defense |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 108,464 | 29,064 |
Machinery (Non-Agriculture, Non-Construction, and Non-Electronic) |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 100,919 | 92,781 |
Leisure, Amusement, Motion Pictures, and Entertainment |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 74,334 | 39,350 |
Electronics |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 71,321 | 0 |
Oil and Gas |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 67,775 | 51,171 |
Buildings and Real Estate |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 61,703 | 60,431 |
Healthcare, Education, and Childcare |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 44,131 | 49,638 |
Mining, Steel, Iron and Non-Precious Metals |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 35,586 | 30,537 |
Chemicals, Plastics, and Rubber |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 15,889 | 20,363 |
Printing and Publishing |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 14,400 | 14,238 |
Cargo Transport |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 12,514 | 13,500 |
Telecommunications |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 6,796 | 9,002 |
Other less than 2.0% |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | $ 10,659 | $ 8,490 |
Investment Owned, at Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 100.00% | 100.00% |
Investment Owned, at Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 100.00% | 100.00% |
Investment Owned, at Fair Value | Industry Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 100.00% | 100.00% |
Investment Owned, at Fair Value | Industry Concentration Risk | Diversified/Conglomerate Services |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 15.60% | 28.70% |
Investment Owned, at Fair Value | Industry Concentration Risk | Home and Office Furnishings, Housewares, and Durable Consumer Products |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 15.30% | 17.30% |
Investment Owned, at Fair Value | Industry Concentration Risk | Hotels, Motels, Inns, and Gaming |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 10.90% | 8.40% |
Investment Owned, at Fair Value | Industry Concentration Risk | Aerospace and Defense |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 10.10% | 3.20% |
Investment Owned, at Fair Value | Industry Concentration Risk | Machinery (Non-Agriculture, Non-Construction, and Non-Electronic) |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 9.40% | 10.10% |
Investment Owned, at Fair Value | Industry Concentration Risk | Leisure, Amusement, Motion Pictures, and Entertainment |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 6.90% | 4.30% |
Investment Owned, at Fair Value | Industry Concentration Risk | Electronics |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 6.70% | 0.00% |
Investment Owned, at Fair Value | Industry Concentration Risk | Oil and Gas |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 6.30% | 5.60% |
Investment Owned, at Fair Value | Industry Concentration Risk | Buildings and Real Estate |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 5.80% | 6.60% |
Investment Owned, at Fair Value | Industry Concentration Risk | Healthcare, Education, and Childcare |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 4.10% | 5.40% |
Investment Owned, at Fair Value | Industry Concentration Risk | Mining, Steel, Iron and Non-Precious Metals |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 3.30% | 3.30% |
Investment Owned, at Fair Value | Industry Concentration Risk | Chemicals, Plastics, and Rubber |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 1.50% | 2.20% |
Investment Owned, at Fair Value | Industry Concentration Risk | Printing and Publishing |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 1.30% | 1.50% |
Investment Owned, at Fair Value | Industry Concentration Risk | Cargo Transport |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 1.20% | 1.50% |
Investment Owned, at Fair Value | Industry Concentration Risk | Telecommunications |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 0.60% | 1.00% |
Investment Owned, at Fair Value | Industry Concentration Risk | Other less than 2.0% |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 1.00% | 0.90% |
Investment Owned, at Fair Value | Geographic Regions Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 100.00% | 100.00% |
Investment Owned, at Fair Value | Geographic Regions Risk | Northeast |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 28.50% | 22.60% |
Investment Owned, at Fair Value | Geographic Regions Risk | South |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 27.60% | 37.70% |
Investment Owned, at Fair Value | Geographic Regions Risk | Midwest |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 20.80% | 15.40% |
Investment Owned, at Fair Value | Geographic Regions Risk | West |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 20.60% | 24.30% |
Investment Owned, at Fair Value | Geographic Regions Risk | Canada |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 2.50% | 0.00% |
Total debt |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 780,457 | $ 658,383 |
Fair Value | $ 708,654 | $ 613,559 |
Total debt | Investment Owned, at Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 76.30% | 77.00% |
Total debt | Investment Owned, at Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 66.00% | 66.60% |
Secured First Lien Debt |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 660,499 | $ 513,425 |
Fair Value | $ 599,911 | $ 474,856 |
Secured First Lien Debt | Investment Owned, at Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 64.60% | 60.10% |
Secured First Lien Debt | Investment Owned, at Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 55.90% | 51.60% |
Secured Second Lien Debt |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 119,958 | $ 144,958 |
Fair Value | $ 108,743 | $ 138,703 |
Secured Second Lien Debt | Investment Owned, at Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 11.70% | 16.90% |
Secured Second Lien Debt | Investment Owned, at Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 10.10% | 15.00% |
Total equity/equivalents |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 241,284 | $ 195,907 |
Fair Value | $ 363,576 | $ 306,945 |
Total equity/equivalents | Investment Owned, at Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 23.70% | 23.00% |
Total equity/equivalents | Investment Owned, at Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 34.00% | 33.40% |
Preferred Equity |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 191,687 | $ 145,070 |
Fair Value | $ 308,226 | $ 213,480 |
Preferred Equity | Investment Owned, at Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 18.80% | 17.00% |
Preferred Equity | Investment Owned, at Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 28.80% | 23.20% |
Common Equity/ Equivalents |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 49,597 | $ 50,837 |
Fair Value | $ 55,350 | $ 93,465 |
Common Equity/ Equivalents | Investment Owned, at Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 4.90% | 6.00% |
Common Equity/ Equivalents | Investment Owned, at Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage of Total Investments | 5.20% | 10.20% |
[1] | Cumulative gross unrealized appreciation for federal income tax purposes is $180.5 million; cumulative gross unrealized depreciation for federal income tax purposes is $115.8 million. Cumulative net unrealized appreciation is $64.7 million, based on a tax cost of $855.8 million.

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