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INVESTMENTS - Investment Holdings (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 851,866 | $ 854,290 | [1]
Fair Value | 899,138 | 920,504 | [1]
South |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 337,009 | 346,838 |
West |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 221,102 | 223,871 |
Northeast |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 200,803 | 207,870 |
Midwest |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 140,224 | 141,925 |
Diversified/Conglomerate Services |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 239,139 | 264,535 |
Home and Office Furnishings, Housewares, and Durable Consumer Products |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 165,201 | 160,038 |
Machinery (Non-Agriculture, Non-Construction, and Non-Electronic) |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 92,527 | 92,781 |
Hotels, Motels, Inns, and Gaming |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 73,646 | 77,366 |
Buildings and Real Estate |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 61,504 | 60,431 |
Oil and Gas |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 52,818 | 51,171 |
Healthcare, Education, and Childcare |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 49,767 | 49,638 |
Leisure, Amusement, Motion Pictures, and Entertainment |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 39,814 | 39,350 |
Mining, Steel, Iron and Non-Precious Metals |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 34,504 | 30,537 |
Aerospace and Defense |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 29,067 | 29,064 |
Chemicals, Plastics, and Rubber |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 19,487 | 20,363 |
Printing and Publishing |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 14,117 | 14,238 |
Cargo Transport |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 13,000 | 13,500 |
Telecommunications |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | 9,197 | 9,002 |
Other less than 2.0% |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Fair Value | $ 5,350 | $ 8,490 |
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 | Diversified/Conglomerate Services |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 26.60% | 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] |  |  |
Concentration risk, percentage | 18.50% | 17.30% |
Investment Owned, At Fair Value | Industry Concentration Risk | Machinery (Non-Agriculture, Non-Construction, and Non-Electronic) |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 10.30% | 10.10% |
Investment Owned, At Fair Value | Industry Concentration Risk | Hotels, Motels, Inns, and Gaming |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 8.20% | 8.40% |
Investment Owned, At Fair Value | Industry Concentration Risk | Buildings and Real Estate |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 6.80% | 6.60% |
Investment Owned, At Fair Value | Industry Concentration Risk | Oil and Gas |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 5.90% | 5.60% |
Investment Owned, At Fair Value | Industry Concentration Risk | Healthcare, Education, and Childcare |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 5.50% | 5.40% |
Investment Owned, At Fair Value | Industry Concentration Risk | Leisure, Amusement, Motion Pictures, and Entertainment |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 4.40% | 4.30% |
Investment Owned, At Fair Value | Industry Concentration Risk | Mining, Steel, Iron and Non-Precious Metals |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 3.80% | 3.30% |
Investment Owned, At Fair Value | Industry Concentration Risk | Aerospace and Defense |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 3.20% | 3.20% |
Investment Owned, At Fair Value | Industry Concentration Risk | Chemicals, Plastics, and Rubber |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 2.20% | 2.20% |
Investment Owned, At Fair Value | Industry Concentration Risk | Printing and Publishing |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 1.60% | 1.50% |
Investment Owned, At Fair Value | Industry Concentration Risk | Cargo Transport |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 1.40% | 1.50% |
Investment Owned, At Fair Value | Industry Concentration Risk | Telecommunications |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 1.00% | 1.00% |
Investment Owned, At Fair Value | Industry Concentration Risk | Other less than 2.0% |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 0.60% | 0.90% |
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 | 37.50% | 37.70% |
Investment Owned, At Fair Value | Geographic Regions Risk | West |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 24.60% | 24.30% |
Investment Owned, At Fair Value | Geographic Regions Risk | Northeast |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 22.30% | 22.60% |
Investment Owned, At Fair Value | Geographic Regions Risk | Midwest |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 15.60% | 15.40% |
Total debt |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 655,980 | $ 658,383 |
Fair Value | $ 601,046 | $ 613,559 |
Total debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 77.00% | 77.00% |
Total debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 66.80% | 66.60% |
Secured First Lien Debt |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 511,022 | $ 513,425 |
Fair Value | $ 463,219 | $ 474,856 |
Secured First Lien Debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 60.00% | 60.10% |
Secured First Lien Debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 51.50% | 51.60% |
Secured Second Lien Debt |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 144,958 | $ 144,958 |
Fair Value | $ 137,827 | $ 138,703 |
Secured Second Lien Debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 17.00% | 16.90% |
Secured Second Lien Debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 15.30% | 15.00% |
Total equity/equivalents |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 195,886 | $ 195,907 |
Fair Value | $ 298,092 | $ 306,945 |
Total equity/equivalents | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 23.00% | 23.00% |
Total equity/equivalents | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 33.20% | 33.40% |
Preferred Equity |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 145,070 | $ 145,070 |
Fair Value | $ 212,591 | $ 213,480 |
Preferred Equity | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 17.00% | 17.00% |
Preferred Equity | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 23.70% | 23.20% |
Common Equity/ Equivalents |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost | $ 50,816 | $ 50,837 |
Fair Value | $ 85,501 | $ 93,465 |
Common Equity/ Equivalents | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 6.00% | 6.00% |
Common Equity/ Equivalents | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Concentration risk, percentage | 9.50% | 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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