Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS - Schedule of Investment Concentrations (Details)

v3.24.3
INVESTMENTS - Schedule of Investment Concentrations (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Sep. 30, 2024
Mar. 31, 2024
Summary of Investment Holdings [Line Items]    
Cost $ 840,147 $ 854,290 [1]
Fair Value 853,307 920,504 [1]
South    
Summary of Investment Holdings [Line Items]    
Fair Value 271,739 346,838
West    
Summary of Investment Holdings [Line Items]    
Fair Value 223,539 223,871
Northeast    
Summary of Investment Holdings [Line Items]    
Fair Value 214,844 207,870
Midwest    
Summary of Investment Holdings [Line Items]    
Fair Value 143,185 141,925
Home and Office Furnishings, Housewares, and Durable Consumer Products    
Summary of Investment Holdings [Line Items]    
Fair Value 164,994 160,038
Diversified/Conglomerate Services    
Summary of Investment Holdings [Line Items]    
Fair Value 164,579 264,535
Hotels, Motels, Inns, and Gaming    
Summary of Investment Holdings [Line Items]    
Fair Value 98,852 77,366
Machinery (Non-Agriculture, Non-Construction, and Non-Electronic)    
Summary of Investment Holdings [Line Items]    
Fair Value 92,474 92,781
Buildings and Real Estate    
Summary of Investment Holdings [Line Items]    
Fair Value 61,749 60,431
Oil and Gas    
Summary of Investment Holdings [Line Items]    
Fair Value 56,379 51,171
Healthcare, Education, and Childcare    
Summary of Investment Holdings [Line Items]    
Fair Value 50,140 49,638
Leisure, Amusement, Motion Pictures, and Entertainment    
Summary of Investment Holdings [Line Items]    
Fair Value 42,381 39,350
Mining, Steel, Iron and Non-Precious Metals    
Summary of Investment Holdings [Line Items]    
Fair Value 33,523 30,537
Aerospace and Defense    
Summary of Investment Holdings [Line Items]    
Fair Value 31,821 29,064
Chemicals, Plastics, and Rubber    
Summary of Investment Holdings [Line Items]    
Fair Value 18,596 20,363
Printing and Publishing    
Summary of Investment Holdings [Line Items]    
Fair Value 13,500 14,238
Cargo Transport    
Summary of Investment Holdings [Line Items]    
Fair Value 12,408 13,500
Telecommunications    
Summary of Investment Holdings [Line Items]    
Fair Value 6,357 9,002
Other less than 2.0%    
Summary of Investment Holdings [Line Items]    
Fair Value $ 5,554 $ 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 | Home and Office Furnishings, Housewares, and Durable Consumer Products    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 19.30% 17.30%
Investment Owned, at Fair Value | Industry Concentration Risk | Diversified/Conglomerate Services    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 19.30% 28.70%
Investment Owned, at Fair Value | Industry Concentration Risk | Hotels, Motels, Inns, and Gaming    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 11.60% 8.40%
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 10.80% 10.10%
Investment Owned, at Fair Value | Industry Concentration Risk | Buildings and Real Estate    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 7.20% 6.60%
Investment Owned, at Fair Value | Industry Concentration Risk | Oil and Gas    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 6.60% 5.60%
Investment Owned, at Fair Value | Industry Concentration Risk | Healthcare, Education, and Childcare    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 5.90% 5.40%
Investment Owned, at Fair Value | Industry Concentration Risk | Leisure, Amusement, Motion Pictures, and Entertainment    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 5.00% 4.30%
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 3.90% 3.30%
Investment Owned, at Fair Value | Industry Concentration Risk | Aerospace and Defense    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 3.70% 3.20%
Investment Owned, at Fair Value | Industry Concentration Risk | Chemicals, Plastics, and Rubber    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 2.20% 2.20%
Investment Owned, at Fair Value | Industry Concentration Risk | Printing and Publishing    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 1.60% 1.50%
Investment Owned, at Fair Value | Industry Concentration Risk | Cargo Transport    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 1.50% 1.50%
Investment Owned, at Fair Value | Industry Concentration Risk | Telecommunications    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 0.70% 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 0.70% 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 | South    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 31.80% 37.70%
Investment Owned, at Fair Value | Geographic Regions Risk | West    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 26.20% 24.30%
Investment Owned, at Fair Value | Geographic Regions Risk | Northeast    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 25.20% 22.60%
Investment Owned, at Fair Value | Geographic Regions Risk | Midwest    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 16.80% 15.40%
Total debt    
Summary of Investment Holdings [Line Items]    
Cost $ 650,480 $ 658,383
Fair Value $ 580,824 $ 613,559
Total debt | Investment Owned, at Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 77.40% 77.00%
Total debt | Investment Owned, at Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 68.00% 66.60%
Secured First Lien Debt    
Summary of Investment Holdings [Line Items]    
Cost $ 530,522 $ 513,425
Fair Value $ 469,480 $ 474,856
Secured First Lien Debt | Investment Owned, at Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 63.10% 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 55.00% 51.60%
Secured Second Lien Debt    
Summary of Investment Holdings [Line Items]    
Cost $ 119,958 $ 144,958
Fair Value $ 111,344 $ 138,703
Secured Second Lien Debt | Investment Owned, at Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 14.30% 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 13.00% 15.00%
Total equity/equivalents    
Summary of Investment Holdings [Line Items]    
Cost $ 189,667 $ 195,907
Fair Value $ 272,483 $ 306,945
Total equity/equivalents | Investment Owned, at Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 22.60% 23.00%
Total equity/equivalents | Investment Owned, at Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 32.00% 33.40%
Preferred Equity    
Summary of Investment Holdings [Line Items]    
Cost $ 145,070 $ 145,070
Fair Value $ 228,528 $ 213,480
Preferred Equity | Investment Owned, at Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 17.30% 17.00%
Preferred Equity | Investment Owned, at Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 26.80% 23.20%
Common Equity/ Equivalents    
Summary of Investment Holdings [Line Items]    
Cost $ 44,597 $ 50,837
Fair Value $ 43,955 $ 93,465
Common Equity/ Equivalents | Investment Owned, at Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 5.30% 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.