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INVESTMENTS - Summary Investment Holdings (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 854,290 | [1] | $ 720,630 | [2]
Fair value | $ 920,504 | [1] | $ 753,543 | [2]
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 | $ 346,838 |  | $ 171,056 |
South | Investment Owned, At Fair Value | Geographic Regions Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 37.70% |  | 22.70% |
West |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair value | $ 223,871 |  | $ 197,989 |
West | Investment Owned, At Fair Value | Geographic Regions Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 24.30% |  | 26.30% |
Northeast |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair value | $ 207,870 |  | $ 266,612 |
Northeast | Investment Owned, At Fair Value | Geographic Regions Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 22.60% |  | 35.40% |
Midwest |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair value | $ 141,925 |  | $ 117,886 |
Midwest | Investment Owned, At Fair Value | Geographic Regions Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 15.40% |  | 15.60% |
Diversified/Conglomerate Services |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair value | $ 264,535 |  | $ 268,954 |
Diversified/Conglomerate Services | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 28.70% |  | 35.70% |
Home and Office Furnishings, Housewares, and Durable Consumer Products |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair value | $ 160,038 |  | $ 143,685 |
Home and Office Furnishings, Housewares, and Durable Consumer Products | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 17.30% |  | 19.10% |
Machinery (Non-Agriculture, Non-Construction, and Non-Electronic) |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair value | $ 92,781 |  | $ 20,088 |
Machinery (Non-Agriculture, Non-Construction, and Non-Electronic) | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 10.10% |  | 2.70% |
Hotels, Motels, Inns, and Gaming |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair value | $ 77,366 |  | $ 58,713 |
Hotels, Motels, Inns, and Gaming | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 8.40% |  | 7.80% |
Buildings and Real Estate |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair value | $ 60,431 |  | $ 60,571 |
Buildings and Real Estate | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 6.60% |  | 8.00% |
Oil and Gas |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair value | $ 51,171 |  | $ 0 |
Oil and Gas | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 5.60% |  | 0.00% |
Healthcare, Education, and Childcare |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair value | $ 49,638 |  | $ 37,445 |
Healthcare, Education, and Childcare | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 5.40% |  | 5.00% |
Leisure, Amusement, Motion Pictures, and Entertainment |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair value | $ 39,350 |  | $ 47,616 |
Leisure, Amusement, Motion Pictures, and Entertainment | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 4.30% |  | 6.30% |
Mining, Steel, Iron and Non-Precious Metals |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair value | $ 30,537 |  | $ 25,998 |
Mining, Steel, Iron and Non-Precious Metals | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 3.30% |  | 3.50% |
Aerospace and Defense |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair value | $ 29,064 |  | $ 22,215 |
Aerospace and Defense | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 3.20% |  | 2.80% |
Chemicals, Plastics, and Rubber |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair value | $ 20,363 |  | $ 24,891 |
Chemicals, Plastics, and Rubber | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 2.20% |  | 3.30% |
Printing and Publishing |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair value | $ 14,238 |  | $ 0 |
Printing and Publishing | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 1.50% |  | 0.00% |
Cargo Transport |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair value | $ 13,500 |  | $ 14,707 |
Cargo Transport | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 1.50% |  | 2.00% |
Telecommunications |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair value | $ 9,002 |  | $ 18,987 |
Telecommunications | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 1.00% |  | 2.50% |
Other less than 2.0% |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Fair value | $ 8,490 |  | $ 9,673 |
Other less than 2.0% | Investment Owned, At Fair Value | Industry Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 0.90% |  | 1.30% |
Total debt |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 658,383 |  | $ 555,597 |
Fair value | $ 613,559 |  | $ 513,251 |
Total debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 77.00% |  | 77.10% |
Total debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 66.60% |  | 68.20% |
Secured First Lien Debt |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 513,425 |  | $ 471,439 |
Fair value | $ 474,856 |  | $ 437,517 |
Secured First Lien Debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 60.10% |  | 65.40% |
Secured First Lien Debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 51.60% |  | 58.10% |
Secured Second Lien Debt |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 144,958 |  | $ 84,158 |
Fair value | $ 138,703 |  | $ 75,734 |
Secured Second Lien Debt | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 16.90% |  | 11.70% |
Secured Second Lien Debt | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 15.00% |  | 10.10% |
Total equity/equivalents |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 195,907 |  | $ 165,033 |
Fair value | $ 306,945 |  | $ 240,292 |
Total equity/equivalents | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 23.00% |  | 22.90% |
Total equity/equivalents | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 33.40% |  | 31.80% |
Preferred Equity |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 145,070 |  | $ 149,099 |
Fair value | $ 213,480 |  | $ 222,585 |
Preferred Equity | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 17.00% |  | 20.70% |
Preferred Equity | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 23.20% |  | 29.50% |
Common Equity/ Equivalents |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Cost | $ 50,837 |  | $ 15,934 |
Fair value | $ 93,465 |  | $ 17,707 |
Common Equity/ Equivalents | Investment Owned, At Cost | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 6.00% |  | 2.20% |
Common Equity/ Equivalents | Investment Owned, At Fair Value | Investment Type Concentration Risk |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration risk, percentage | 10.20% |  | 2.30% |
[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.
[2] | Cumulative gross unrealized appreciation for federal income tax purposes is $150.4 million; cumulative gross unrealized depreciation for federal income tax purposes is $119.3 million. Cumulative net unrealized appreciation is $31.1 million, based on a tax cost of $722.4 million.

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