XML 50 R39.htm IDEA: XBRL DOCUMENT
v3.25.3

INVESTMENTS (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Mar. 31, 2025
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 1,877,907 | [1],[2],[3],[4],[5] | $ 1,785,299 | [6],[7],[8],[9],[10]
Percentage of Net Assets at Fair Value | 198.30% | [1],[2],[4],[5] | 202.04% | [6],[7],[8],[9]
Cost | $ 1,896,526 | [1],[2],[4],[5],[11] | $ 1,779,360 | [6],[7],[8],[9],[12],[13]
Northeast |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 524,249 |  | $ 469,271 |
Percentage of Net Assets at Fair Value | 55.40% |  | 53.10% |
Cost | $ 531,394 |  | $ 474,642 |
Southwest |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 393,467 |  | $ 323,966 |
Percentage of Net Assets at Fair Value | 41.50% |  | 36.70% |
Cost | $ 373,910 |  | $ 317,428 |
West |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 350,194 |  | $ 388,772 |
Percentage of Net Assets at Fair Value | 37.00% |  | 44.00% |
Cost | $ 340,802 |  | $ 359,986 |
Southeast |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 314,205 |  | $ 315,033 |
Percentage of Net Assets at Fair Value | 33.20% |  | 35.60% |
Cost | $ 352,045 |  | $ 338,866 |
Midwest |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 266,289 |  | $ 241,814 |
Percentage of Net Assets at Fair Value | 28.10% |  | 27.40% |
Cost | $ 270,754 |  | $ 246,198 |
International |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 29,503 |  | $ 46,443 |
Percentage of Net Assets at Fair Value | 3.10% |  | 5.20% |
Cost | $ 27,621 |  | $ 42,240 |
Healthcare Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 214,522 |  | $ 212,640 |
Percentage of Net Assets at Fair Value | 22.70% |  | 24.10% |
Cost | $ 243,566 |  | $ 228,935 |
Consumer Products |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 162,538 |  | $ 152,385 |
Percentage of Net Assets at Fair Value | 17.20% |  | 17.30% |
Cost | $ 161,437 |  | $ 152,385 |
Media & Marketing |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 163,592 |  | $ 138,768 |
Percentage of Net Assets at Fair Value | 17.30% |  | 15.70% |
Cost | $ 162,998 |  | $ 138,291 |
Consumer Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 144,666 |  | $ 117,117 |
Percentage of Net Assets at Fair Value | 15.30% |  | 13.30% |
Cost | $ 153,527 |  | $ 123,084 |
Food, Agriculture & Beverage |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 120,282 |  | $ 125,740 |
Percentage of Net Assets at Fair Value | 12.70% |  | 14.20% |
Cost | $ 130,125 |  | $ 131,815 |
Financial Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 119,261 |  | $ 123,280 |
Percentage of Net Assets at Fair Value | 12.60% |  | 14.00% |
Cost | $ 108,981 |  | $ 95,060 |
Transportation & Logistics |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 113,860 |  | $ 88,871 |
Percentage of Net Assets at Fair Value | 12.00% |  | 10.10% |
Cost | $ 77,443 |  | $ 63,155 |
Business Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 90,005 |  | $ 94,008 |
Percentage of Net Assets at Fair Value | 9.50% |  | 10.60% |
Cost | $ 94,492 |  | $ 96,685 |
Industrial Products |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 59,344 |  | $ 75,548 |
Percentage of Net Assets at Fair Value | 6.30% |  | 8.50% |
Cost | $ 52,058 |  | $ 66,050 |
Industrial Machinery |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 72,603 |  | $ 76,874 |
Percentage of Net Assets at Fair Value | 7.70% |  | 8.70% |
Cost | $ 74,560 |  | $ 75,647 |
Healthcare Equipment & Supplies |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 65,790 |  | $ 66,144 |
Percentage of Net Assets at Fair Value | 6.90% |  | 7.50% |
Cost | $ 63,900 |  | $ 65,057 |
Commercial Services & Supplies |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 92,620 |  | $ 58,340 |
Percentage of Net Assets at Fair Value | 9.80% |  | 6.60% |
Cost | $ 91,164 |  | $ 57,633 |
Aerospace & Defense |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value |  |  | $ 55,051 |
Percentage of Net Assets at Fair Value |  |  | 6.20% |
Cost |  |  | $ 54,097 |
Environmental Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 57,598 |  | $ 52,295 |
Percentage of Net Assets at Fair Value | 6.10% |  | 5.90% |
Cost | $ 59,712 |  | $ 56,191 |
Software & IT Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 52,620 |  | $ 52,422 |
Percentage of Net Assets at Fair Value | 5.60% |  | 5.90% |
Cost | $ 53,539 |  | $ 52,553 |
Research & Consulting Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 46,138 |  | $ 36,045 |
Percentage of Net Assets at Fair Value | 4.90% |  | 4.10% |
Cost | $ 45,480 |  | $ 35,309 |
Specialty Retail |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 39,379 |  | $ 38,272 |
Percentage of Net Assets at Fair Value | 4.20% |  | 4.30% |
Cost | $ 37,318 |  | $ 36,647 |
Industrial Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 44,002 |  | $ 21,599 |
Percentage of Net Assets at Fair Value | 4.60% |  | 2.40% |
Cost | $ 43,651 |  | $ 21,634 |
Healthcare Products |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 38,164 |  | $ 34,474 |
Percentage of Net Assets at Fair Value | 4.00% |  | 3.90% |
Cost | $ 38,552 |  | $ 35,087 |
Education |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 29,750 |  | $ 29,495 |
Percentage of Net Assets at Fair Value | 3.10% |  | 3.30% |
Cost | $ 41,465 |  | $ 41,443 |
Restaurants |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 25,530 |  | $ 25,656 |
Percentage of Net Assets at Fair Value | 2.70% |  | 2.90% |
Cost | $ 25,253 |  | $ 25,329 |
Pharmaceuticals, Biotechnology & Life Sciences |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 38,481 |  | $ 24,877 |
Percentage of Net Assets at Fair Value | 4.10% |  | 2.80% |
Cost | $ 41,435 |  | $ 34,199 |
Energy Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 22,065 |  | $ 25,022 |
Percentage of Net Assets at Fair Value | 2.30% |  | 2.80% |
Cost | $ 21,895 |  | $ 25,362 |
Telecommunications |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 24,455 |  | $ 19,920 |
Percentage of Net Assets at Fair Value | 2.60% |  | 2.30% |
Cost | $ 29,458 |  | $ 23,504 |
Distribution |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 13,660 |  | $ 11,773 |
Percentage of Net Assets at Fair Value | 1.40% |  | 1.30% |
Cost | $ 11,729 |  | $ 11,873 |
Technology Products & Components |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 8,975 |  | $ 10,378 |
Percentage of Net Assets at Fair Value | 0.90% |  | 1.20% |
Cost | $ 12,942 |  | $ 13,031 |
Movies & Entertainment |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 9,087 |  | $ 8,690 |
Percentage of Net Assets at Fair Value | 0.90% |  | 1.00% |
Cost | $ 8,656 |  | $ 8,403 |
Building & Infrastructure Products |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 6,610 |  | $ 7,522 |
Percentage of Net Assets at Fair Value | 0.70% |  | 0.90% |
Cost | $ 8,899 |  | $ 8,830 |
Data Processing & Outsourced Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 2,310 |  | $ 2,093 |
Percentage of Net Assets at Fair Value | 0.20% |  | 0.20% |
Cost | $ 2,291 |  | $ 2,071 |
First Lien Loans, Last Out |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | 23,600 |  | 23,400 |
First Lien Loans, Split Lien Term Loans |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | 59,300 |  | 59,900 |
Second Lien Loans, Split Lien Term Loans |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | 16,000 |  | 15,900 |
Unsecured Convertible Notes |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 200 |  | $ 200 |
Percentage of Total Portfolio at Fair Value | Investment Type |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 100.00% |  | 100.00% |
Percentage of Total Portfolio at Fair Value | Industry |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 100.00% |  | 100.00% |
Percentage of Total Portfolio at Fair Value | Industry | Healthcare Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 11.40% |  | 11.90% |
Percentage of Total Portfolio at Fair Value | Industry | Consumer Products |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 8.70% |  | 8.50% |
Percentage of Total Portfolio at Fair Value | Industry | Media & Marketing |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 8.70% |  | 7.80% |
Percentage of Total Portfolio at Fair Value | Industry | Consumer Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 7.70% |  | 6.60% |
Percentage of Total Portfolio at Fair Value | Industry | Food, Agriculture & Beverage |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 6.40% |  | 7.10% |
Percentage of Total Portfolio at Fair Value | Industry | Financial Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 6.40% |  | 6.90% |
Percentage of Total Portfolio at Fair Value | Industry | Transportation & Logistics |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 6.00% |  | 5.00% |
Percentage of Total Portfolio at Fair Value | Industry | Business Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 4.80% |  | 5.30% |
Percentage of Total Portfolio at Fair Value | Industry | Industrial Products |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 3.10% |  | 4.20% |
Percentage of Total Portfolio at Fair Value | Industry | Industrial Machinery |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 3.90% |  | 4.30% |
Percentage of Total Portfolio at Fair Value | Industry | Healthcare Equipment & Supplies |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 3.50% |  | 3.70% |
Percentage of Total Portfolio at Fair Value | Industry | Commercial Services & Supplies |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 4.90% |  | 3.30% |
Percentage of Total Portfolio at Fair Value | Industry | Aerospace & Defense |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value |  |  | 3.10% |
Percentage of Total Portfolio at Fair Value | Industry | Environmental Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 3.10% |  | 2.90% |
Percentage of Total Portfolio at Fair Value | Industry | Software & IT Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 2.80% |  | 2.90% |
Percentage of Total Portfolio at Fair Value | Industry | Research & Consulting Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 2.50% |  | 2.00% |
Percentage of Total Portfolio at Fair Value | Industry | Specialty Retail |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 2.10% |  | 2.10% |
Percentage of Total Portfolio at Fair Value | Industry | Industrial Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 2.30% |  | 1.20% |
Percentage of Total Portfolio at Fair Value | Industry | Healthcare Products |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 2.00% |  | 1.90% |
Percentage of Total Portfolio at Fair Value | Industry | Education |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 1.60% |  | 1.70% |
Percentage of Total Portfolio at Fair Value | Industry | Restaurants |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 1.40% |  | 1.40% |
Percentage of Total Portfolio at Fair Value | Industry | Pharmaceuticals, Biotechnology & Life Sciences |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 2.00% |  | 1.40% |
Percentage of Total Portfolio at Fair Value | Industry | Energy Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 1.20% |  | 1.40% |
Percentage of Total Portfolio at Fair Value | Industry | Telecommunications |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 1.30% |  | 1.10% |
Percentage of Total Portfolio at Fair Value | Industry | Distribution |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 0.70% |  | 0.70% |
Percentage of Total Portfolio at Fair Value | Industry | Technology Products & Components |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 0.50% |  | 0.60% |
Percentage of Total Portfolio at Fair Value | Industry | Movies & Entertainment |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 0.50% |  | 0.50% |
Percentage of Total Portfolio at Fair Value | Industry | Building & Infrastructure Products |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 0.40% |  | 0.40% |
Percentage of Total Portfolio at Fair Value | Industry | Data Processing & Outsourced Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 0.10% |  | 0.10% |
Percentage of Total Portfolio at Fair Value | Geographic |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 100.00% |  | 100.00% |
Percentage of Total Portfolio at Fair Value | Geographic | Northeast |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 27.90% |  | 26.30% |
Percentage of Total Portfolio at Fair Value | Geographic | Southwest |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 21.00% |  | 18.20% |
Percentage of Total Portfolio at Fair Value | Geographic | West |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 18.60% |  | 21.80% |
Percentage of Total Portfolio at Fair Value | Geographic | Southeast |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 16.70% |  | 17.60% |
Percentage of Total Portfolio at Fair Value | Geographic | Midwest |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 14.20% |  | 13.50% |
Percentage of Total Portfolio at Fair Value | Geographic | International |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 1.60% |  | 2.60% |
Percentage of Total Portfolio at Cost | Investment Type |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 100.00% |  | 100.00% |
Percentage of Total Portfolio at Cost | Industry |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 100.00% |  | 100.00% |
Percentage of Total Portfolio at Cost | Industry | Healthcare Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 12.80% |  | 12.90% |
Percentage of Total Portfolio at Cost | Industry | Consumer Products |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 8.50% |  | 8.60% |
Percentage of Total Portfolio at Cost | Industry | Media & Marketing |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 8.60% |  | 7.80% |
Percentage of Total Portfolio at Cost | Industry | Consumer Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 8.10% |  | 6.90% |
Percentage of Total Portfolio at Cost | Industry | Food, Agriculture & Beverage |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 6.90% |  | 7.40% |
Percentage of Total Portfolio at Cost | Industry | Financial Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 5.70% |  | 5.30% |
Percentage of Total Portfolio at Cost | Industry | Transportation & Logistics |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 4.10% |  | 3.50% |
Percentage of Total Portfolio at Cost | Industry | Business Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 5.00% |  | 5.40% |
Percentage of Total Portfolio at Cost | Industry | Industrial Products |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 2.70% |  | 3.70% |
Percentage of Total Portfolio at Cost | Industry | Industrial Machinery |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 3.90% |  | 4.30% |
Percentage of Total Portfolio at Cost | Industry | Healthcare Equipment & Supplies |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 3.40% |  | 3.70% |
Percentage of Total Portfolio at Cost | Industry | Commercial Services & Supplies |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 4.80% |  | 3.20% |
Percentage of Total Portfolio at Cost | Industry | Aerospace & Defense |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value |  |  | 3.00% |
Percentage of Total Portfolio at Cost | Industry | Environmental Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 3.10% |  | 3.20% |
Percentage of Total Portfolio at Cost | Industry | Software & IT Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 2.80% |  | 3.00% |
Percentage of Total Portfolio at Cost | Industry | Research & Consulting Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 2.40% |  | 2.00% |
Percentage of Total Portfolio at Cost | Industry | Specialty Retail |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 2.00% |  | 2.10% |
Percentage of Total Portfolio at Cost | Industry | Industrial Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 2.30% |  | 1.20% |
Percentage of Total Portfolio at Cost | Industry | Healthcare Products |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 2.00% |  | 2.00% |
Percentage of Total Portfolio at Cost | Industry | Education |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 2.30% |  | 2.30% |
Percentage of Total Portfolio at Cost | Industry | Restaurants |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 1.30% |  | 1.40% |
Percentage of Total Portfolio at Cost | Industry | Pharmaceuticals, Biotechnology & Life Sciences |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 2.20% |  | 1.90% |
Percentage of Total Portfolio at Cost | Industry | Energy Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 1.20% |  | 1.40% |
Percentage of Total Portfolio at Cost | Industry | Telecommunications |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 1.60% |  | 1.30% |
Percentage of Total Portfolio at Cost | Industry | Distribution |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 0.60% |  | 0.70% |
Percentage of Total Portfolio at Cost | Industry | Technology Products & Components |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 0.70% |  | 0.70% |
Percentage of Total Portfolio at Cost | Industry | Movies & Entertainment |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 0.50% |  | 0.50% |
Percentage of Total Portfolio at Cost | Industry | Building & Infrastructure Products |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 0.40% |  | 0.50% |
Percentage of Total Portfolio at Cost | Industry | Data Processing & Outsourced Services |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 0.10% |  | 0.10% |
Percentage of Total Portfolio at Cost | Geographic |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 100.00% |  | 100.00% |
Percentage of Total Portfolio at Cost | Geographic | Northeast |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 28.00% |  | 26.70% |
Percentage of Total Portfolio at Cost | Geographic | Southwest |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 19.70% |  | 17.80% |
Percentage of Total Portfolio at Cost | Geographic | West |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 18.00% |  | 20.20% |
Percentage of Total Portfolio at Cost | Geographic | Southeast |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 18.50% |  | 19.10% |
Percentage of Total Portfolio at Cost | Geographic | Midwest |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 14.30% |  | 13.80% |
Percentage of Total Portfolio at Cost | Geographic | International |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 1.50% |  | 2.40% |
First lien loans |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 1,687,942 |  | $ 1,586,622 |
Percentage of Net Assets at Fair Value | 178.30% |  | 179.60% |
Cost | $ 1,735,351 |  | $ 1,627,746 |
First lien loans | Percentage of Total Portfolio at Fair Value | Investment Type |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 89.90% |  | 88.90% |
First lien loans | Percentage of Total Portfolio at Cost | Investment Type |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 91.50% |  | 91.50% |
Second lien loans |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 17,170 |  | $ 18,066 |
Percentage of Net Assets at Fair Value | 1.80% |  | 2.00% |
Cost | $ 23,980 |  | $ 23,955 |
Second lien loans | Percentage of Total Portfolio at Fair Value | Investment Type |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 0.90% |  | 1.00% |
Second lien loans | Percentage of Total Portfolio at Cost | Investment Type |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 1.30% |  | 1.30% |
Subordinated debt |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 1,139 |  | $ 1,218 |
Percentage of Net Assets at Fair Value | 0.10% |  | 0.10% |
Cost | $ 1,337 |  | $ 1,417 |
Subordinated debt | Percentage of Total Portfolio at Fair Value | Investment Type |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 0.10% |  | 0.10% |
Subordinated debt | Percentage of Total Portfolio at Cost | Investment Type |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 0.10% |  | 0.10% |
Preferred equity |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 66,474 |  | $ 102,918 |
Percentage of Net Assets at Fair Value | 7.00% |  | 11.60% |
Cost | $ 76,408 |  | $ 77,451 |
Preferred equity | Percentage of Total Portfolio at Fair Value | Investment Type |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 3.50% |  | 5.70% |
Preferred equity | Percentage of Total Portfolio at Cost | Investment Type |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 4.00% |  | 4.40% |
Common equity & warrants |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 101,440 |  | $ 76,475 |
Percentage of Net Assets at Fair Value | 10.70% |  | 8.70% |
Cost | $ 55,993 |  | $ 48,791 |
Common equity & warrants | Percentage of Total Portfolio at Fair Value | Investment Type |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 5.40% |  | 4.30% |
Common equity & warrants | Percentage of Total Portfolio at Cost | Investment Type |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 2.90% |  | 2.70% |
Earnout |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 3,742 |  |  |
Percentage of Net Assets at Fair Value | 0.40% |  |  |
Cost | $ 3,457 |  |  |
Earnout | Percentage of Total Portfolio at Fair Value | Investment Type |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 0.20% |  |  |
Earnout | Percentage of Total Portfolio at Cost | Investment Type |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Percentage of Total Portfolio at Fair Value | 0.20% |  |  |
[1] | All debt investments are income-producing, unless otherwise noted. Equity investments are non-income producing, unless otherwise noted. (2)All of the Company’s investments, the investments of Capital Southwest SPV LLC ("SPV"), the investments of SBIC I (as defined below) and the investments of SBIC II (as defined below) are pledged as collateral for the Company’s senior secured revolving credit facility, the SPV's financing credit facility or in support of the SBA-guaranteed debentures to be issued by Capital Southwest SBIC I, LP ("SBIC I") and Capital Southwest SBIC II, LP ("SBIC II"), the Company's wholly-owned subsidiaries that operate as small business investment companies, respectively.
[2] | Non-Control/Non-Affiliate investments are generally defined by the 1940 Act as investments that are neither control investments nor affiliate investments. Investments are classified as non-control/non-affiliate investments, unless otherwise noted. At September 30, 2025, the Company held $1,488.4 million of non-control/non-affiliate investments, which represented approximately 79.3% of the Company’s investment assets. The fair value of these investments as a percent of net assets is 157.1%.
[3] | The Company's investment portfolio is comprised entirely of debt and equity securities of privately held companies for which quoted prices falling within the categories of Level 1 and Level 2 inputs are not readily available. Therefore, the Company values all of its portfolio investments at fair value, as determined in good faith by the valuation committee comprised of certain officers of the Company (the "Valuation Committee") as the valuation designee of the Board of Directors (the "Valuation Designee") pursuant to Rule 2a-5 under the Investment Company Act of 1940, as amended (the “1940 Act”), using significant unobservable Level 3 inputs. Refer to Note 4 - Fair Value Measurements for further discussion.
[4] | Equity ownership may be held in shares or units of a company that is either wholly owned by the portfolio company or under common control by the same parent company to the portfolio company.
[5] | Unless otherwise noted, all portfolio company headquarters are based in the United States.
[6] | Equity ownership may be held in shares or units of a company that is either wholly owned by the portfolio company or under common control by the same parent company to the portfolio company.
[7] | Unless otherwise noted, all portfolio company headquarters are based in the United States.
[8] | All debt investments are income-producing, unless otherwise noted. Equity investments are non-income producing, unless otherwise noted.
[9] | Non-Control/Non-Affiliate investments are generally defined by the 1940 Act as investments that are neither control investments nor affiliate investments. Investments are classified as non-control/non-affiliate investments, unless otherwise noted. At March 31, 2025, the Company held $1,436.3 million of non-control/non-affiliate investments, which represented approximately 80.5% of the Company’s investment assets. The fair value of these investments as a percent of net assets is 162.6%.
[10] | The Company's investment portfolio is comprised entirely of debt and equity securities of privately held companies for which quoted prices falling within the categories of Level 1 and Level 2 inputs are not readily available. Therefore, the Company values all of its portfolio investments at fair value, as determined in good faith by the valuation committee comprised of certain officers of the Company (the "Valuation Committee") as the valuation designee of the Board of Directors (the "Valuation Designee") pursuant to Rule 2a-5 under the Investment Company Act of 1940, as amended (the “1940 Act”), using significant unobservable Level 3 inputs. Refer to Note 4 - Fair Value Measurements for further discussion.
[11] | As of September 30, 2025, the cumulative gross unrealized appreciation for U.S. federal income tax purposes was approximately $112.3 million; cumulative gross unrealized depreciation for federal income tax purposes was $127.1 million. Cumulative net unrealized depreciation was $14.8 million, based on a tax cost of $1,885.0 million.
[12] | As of March 31, 2025, the cumulative gross unrealized appreciation for U.S. federal income tax purposes was approximately $117.4 million; cumulative gross unrealized depreciation for federal income tax purposes was $108.2 million. Cumulative net unrealized depreciation was $9.2 million, based on a tax cost of $1,776.1 million.
[13] | Negative cost in this column represents the original issue discount of certain undrawn revolvers and delayed draw term loans.

X
- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-42 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-18 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 20 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-20 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-18 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-18 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-18 + Details
Name: | us-gaap_ConcentrationRiskPercentage1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-8 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 805 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 43 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479303/805-10-55-43 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cost of the investment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 55 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477439/946-210-55-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-6 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479168/946-830-55-12 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-6 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(d)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479886/946-10-S99-3 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column C)(Footnote 8)(a)(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column C)(Footnote 11)(a)(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column F)(Footnote 5)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 19 -Subparagraph (3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-19 + Details
Name: | us-gaap_InvestmentOwnedAtCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of investment in security owned. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(11)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-6 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 55 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477439/946-210-55-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-6 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-6 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-1 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-1 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-1 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-2 Reference 11: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479168/946-830-55-12 Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-6 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(d)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479886/946-10-S99-3 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(2)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(2)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1 Reference 17: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column C)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1 Reference 18: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column A)(Footnote 1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1 Reference 19: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column C)(Footnote 5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1 Reference 20: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column C)(Footnote 6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1 Reference 21: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column C)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3 Reference 22: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column C)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3 Reference 23: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column A)(Footnote 6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3 Reference 24: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column A)(Footnote 7)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3 Reference 25: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column C)(Footnote 9)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3 Reference 26: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column F)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6 Reference 27: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column A)(Footnote 1)(b)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6 Reference 28: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column A)(Footnote 1)(b)(5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6 Reference 29: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column F)(Footnote 4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6 Reference 30: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column F)(Footnote 7)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6 + Details
Name: | us-gaap_InvestmentOwnedAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of investment owned to net assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 55 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477439/946-210-55-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-6 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-1 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-6 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column C)(Footnote 5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column D)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column C)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column A)(Footnote 6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column F)(Footnote 7)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6 + Details
Name: | us-gaap_InvestmentOwnedPercentOfNetAssets
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_StatementGeographicalAxis=us-gaap_NortheastRegionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=us-gaap_SouthwestRegionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=us-gaap_WestRegionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=us-gaap_SoutheastRegionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=us-gaap_MidwestRegionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=us-gaap_NonUsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_HealthcareServicesSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_ConsumerProductsSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_MediaAndMarketingSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_ConsumerServicesSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_FoodAgricultureAndBeverageSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=us-gaap_FinancialServicesSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=us-gaap_TransportationSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_BusinessServicesSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_IndustrialProductsSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_IndustrialMachinerySectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_HealthcareEquipmentSuppliesSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_CommercialServicesSuppliesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_AerospaceAndDefenseSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_EnvironmentalServicesSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_SoftwareAndITServicesSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_ResearchConsultingServicesSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_SpecialtyRetailSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_IndustrialServicesSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_HealthcareProductsSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_EducationSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_RestaurantsSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_PharmaceuticalsBiotechnologyLifeSciencesSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_EnergyServicesMidstreamSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_TelecommunicationsSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_DistributionSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=us-gaap_TechnologySectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_MoviesEntertainmentSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_BuildingInfrastructureProductsSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EquitySecuritiesByIndustryAxis=cswc_DataProcessingOutsourcedServicesSectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=cswc_FirstLienLoansLastOutMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=cswc_FirstLienLoansSplitLienTermLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=cswc_SecondLienLoansSplitLienTermLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=cswc_UnsecuredConvertibleNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=cswc_InvestmentOwnedFairValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=cswc_InvestmentTypeConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=cswc_IndustryConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_GeographicConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=cswc_InvestmentOwnedCostMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=cswc_DebtSecuritiesFirstLienMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=cswc_DebtSecuritiesSecondLienMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_SubordinatedDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_PreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=cswc_CommonEquityWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=cswc_EarnoutMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |