Annual report [Section 13 and 15(d), not S-K Item 405]

INVESTMENTS - Schedule of Investment Concentrations (Details)

v3.26.1
INVESTMENTS - Schedule of Investment Concentrations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Summary of Investment Holdings [Line Items]    
Cost $ 1,052,848 [1] $ 939,066 [2]
Fair Value $ 1,309,248 [1] $ 979,320 [2]
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 | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 100.00% 100.00%
South    
Summary of Investment Holdings [Line Items]    
Fair Value $ 649,436 $ 317,294
South | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 49.60% 32.40%
West    
Summary of Investment Holdings [Line Items]    
Fair Value $ 227,294 $ 222,062
West | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 17.30% 22.70%
Midwest    
Summary of Investment Holdings [Line Items]    
Fair Value $ 216,726 $ 227,415
Midwest | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 16.60% 23.20%
Northeast    
Summary of Investment Holdings [Line Items]    
Fair Value $ 193,837 $ 182,669
Northeast | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 14.80% 18.70%
Canada    
Summary of Investment Holdings [Line Items]    
Fair Value $ 21,955 $ 29,880
Canada | Investment Owned, At Fair Value | Geographic Regions Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 1.70% 3.00%
Machinery (Non-Agriculture, Non-Construction, and Non-Electronic)    
Summary of Investment Holdings [Line Items]    
Fair Value $ 258,692 $ 105,432
Machinery (Non-Agriculture, Non-Construction, and Non-Electronic) | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 19.80% 10.80%
Diversified/Conglomerate Services    
Summary of Investment Holdings [Line Items]    
Fair Value $ 189,148 $ 170,360
Diversified/Conglomerate Services | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 14.40% 17.40%
Aerospace and Defense    
Summary of Investment Holdings [Line Items]    
Fair Value $ 174,542 $ 107,869
Aerospace and Defense | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 13.40% 10.90%
Home and Office Furnishings, Housewares, and Durable Consumer Products    
Summary of Investment Holdings [Line Items]    
Fair Value $ 166,553 $ 159,236
Home and Office Furnishings, Housewares, and Durable Consumer Products | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 12.70% 16.30%
Oil and Gas    
Summary of Investment Holdings [Line Items]    
Fair Value $ 125,605 $ 69,589
Oil and Gas | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 9.60% 7.10%
Leisure, Amusement, Motion Pictures, and Entertainment    
Summary of Investment Holdings [Line Items]    
Fair Value $ 105,339 $ 78,460
Leisure, Amusement, Motion Pictures, and Entertainment | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 8.00% 8.00%
Buildings and Real Estate    
Summary of Investment Holdings [Line Items]    
Fair Value $ 68,987 $ 69,320
Buildings and Real Estate | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 5.30% 7.10%
Electronics    
Summary of Investment Holdings [Line Items]    
Fair Value $ 62,723 $ 71,573
Electronics | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 4.80% 7.20%
Chemicals, Plastics, and Rubber    
Summary of Investment Holdings [Line Items]    
Fair Value $ 49,715 $ 11,612
Chemicals, Plastics, and Rubber | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 3.80% 1.20%
Healthcare, Education, and Childcare    
Summary of Investment Holdings [Line Items]    
Fair Value $ 41,630 $ 51,501
Healthcare, Education, and Childcare | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 3.20% 5.30%
Mining, Steel, Iron and Non-Precious Metals    
Summary of Investment Holdings [Line Items]    
Fair Value $ 37,713 $ 41,010
Mining, Steel, Iron and Non-Precious Metals | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 2.90% 4.20%
Printing and Publishing    
Summary of Investment Holdings [Line Items]    
Fair Value $ 8,379 $ 11,681
Printing and Publishing | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 0.60% 1.20%
Telecommunications    
Summary of Investment Holdings [Line Items]    
Fair Value $ 7,942 $ 7,585
Telecommunications | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 0.60% 0.80%
Diversified/Conglomerate Manufacturing    
Summary of Investment Holdings [Line Items]    
Fair Value $ 6,763 $ 6,493
Diversified/Conglomerate Manufacturing | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 0.50% 0.70%
Other less than 2.0%    
Summary of Investment Holdings [Line Items]    
Fair Value $ 5,517 $ 17,599
Other less than 2.0% | Investment Owned, At Fair Value | Industry Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 0.40% 1.80%
Total debt    
Summary of Investment Holdings [Line Items]    
Cost $ 745,848 $ 687,982
Fair Value $ 669,799 $ 617,914
Total debt | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 70.80% 73.30%
Total debt | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 51.20% 63.10%
Secured First Lien Debt    
Summary of Investment Holdings [Line Items]    
Cost $ 593,008 $ 584,026
Fair Value $ 570,602 $ 514,334
Secured First Lien Debt | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 56.30% 62.20%
Secured First Lien Debt | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 43.60% 52.50%
Secured Second Lien Debt    
Summary of Investment Holdings [Line Items]    
Cost $ 152,840 $ 103,956
Fair Value $ 99,197 $ 103,580
Secured Second Lien Debt | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 14.50% 11.10%
Secured Second Lien Debt | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 7.60% 10.60%
Total equity/equivalents    
Summary of Investment Holdings [Line Items]    
Cost $ 307,000 $ 251,084
Fair Value $ 639,449 $ 361,406
Total equity/equivalents | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 29.20% 26.70%
Total equity/equivalents | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 48.80% 36.90%
Preferred Equity    
Summary of Investment Holdings [Line Items]    
Cost $ 257,403 $ 201,487
Fair Value $ 426,949 $ 302,163
Preferred Equity | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 24.50% 21.50%
Preferred Equity | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 32.60% 30.90%
Common Equity/ Equivalents    
Summary of Investment Holdings [Line Items]    
Cost $ 49,597 $ 49,597
Fair Value $ 212,500 $ 59,243
Common Equity/ Equivalents | Investment Owned, At Cost | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 4.70% 5.20%
Common Equity/ Equivalents | Investment Owned, At Fair Value | Investment Type Concentration Risk    
Summary of Investment Holdings [Line Items]    
Percentage of Total Investments 16.20% 6.00%
[1] Cumulative gross unrealized appreciation for federal income tax purposes is $428.5 million; cumulative gross unrealized depreciation for federal income tax purposes is $173.7 million. Cumulative net unrealized appreciation is $254.8 million, based on a tax cost of $1.1 billion.
[2] Cumulative gross unrealized appreciation for federal income tax purposes is $183.3 million; cumulative gross unrealized depreciation for federal income tax purposes is $144.9 million. Cumulative net unrealized appreciation is $38.5 million, based on a tax cost of $940.9 million.