v3.25.4
INVESTMENTS (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Dec. 31, 2025
Mar. 31, 2025
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 2,013,205 [1],[2],[3],[4],[5] $ 1,785,299 [6],[7],[8],[9],[10]
Percentage of Net Assets at Fair Value 202.20% [1],[2],[4],[5] 202.04% [6],[7],[9],[10]
Cost $ 2,031,166 [1],[2],[4],[5],[11] $ 1,779,360 [6],[7],[9],[10],[12],[13]
Northeast    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 557,141 $ 469,271
Percentage of Net Assets at Fair Value 56.00% 53.10%
Cost $ 559,729 $ 474,642
Southwest    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 415,680 $ 323,966
Percentage of Net Assets at Fair Value 41.80% 36.70%
Cost $ 396,430 $ 317,428
Southeast    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 394,013 $ 315,033
Percentage of Net Assets at Fair Value 39.60% 35.60%
Cost $ 433,060 $ 338,866
West    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 349,268 $ 388,772
Percentage of Net Assets at Fair Value 35.00% 44.00%
Cost $ 341,668 $ 359,986
Midwest    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 265,158 $ 241,814
Percentage of Net Assets at Fair Value 26.60% 27.40%
Cost $ 270,236 $ 246,198
International    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 31,945 $ 46,443
Percentage of Net Assets at Fair Value 3.20% 5.20%
Cost $ 30,043 $ 42,240
Healthcare Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 254,782 $ 212,640
Percentage of Net Assets at Fair Value 25.60% 24.10%
Cost $ 283,630 $ 228,935
Consumer Products    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 191,988 $ 152,385
Percentage of Net Assets at Fair Value 19.30% 17.30%
Cost $ 189,105 $ 152,385
Media & Marketing    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 188,986 $ 138,768
Percentage of Net Assets at Fair Value 19.00% 15.70%
Cost $ 188,001 $ 138,291
Consumer Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 180,100 $ 117,117
Percentage of Net Assets at Fair Value 18.10% 13.30%
Cost $ 190,087 $ 123,084
Food, Agriculture & Beverage    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 120,559 $ 125,740
Percentage of Net Assets at Fair Value 12.10% 14.20%
Cost $ 131,443 $ 131,815
Financial Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 81,841 $ 123,280
Percentage of Net Assets at Fair Value 8.20% 14.00%
Cost $ 71,620 $ 95,060
Transportation & Logistics    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 122,634 $ 88,871
Percentage of Net Assets at Fair Value 12.30% 10.10%
Cost $ 86,480 $ 63,155
Commercial Services & Supplies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 55,533 $ 58,340
Percentage of Net Assets at Fair Value 5.60% 6.60%
Cost $ 54,502 $ 57,633
Business Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 94,580 $ 94,008
Percentage of Net Assets at Fair Value 9.50% 10.60%
Cost $ 99,284 $ 96,685
Industrial Machinery    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 69,855 $ 76,874
Percentage of Net Assets at Fair Value 7.00% 8.70%
Cost $ 74,519 $ 75,647
Healthcare Equipment & Supplies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 71,118 $ 66,144
Percentage of Net Assets at Fair Value 7.10% 7.50%
Cost $ 64,894 $ 65,057
Industrial Products    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 55,042 $ 75,548
Percentage of Net Assets at Fair Value 5.50% 8.50%
Cost $ 43,947 $ 66,050
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 $ 55,907 $ 52,295
Percentage of Net Assets at Fair Value 5.60% 5.90%
Cost $ 60,399 $ 56,191
Software & IT Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 52,962 $ 52,422
Percentage of Net Assets at Fair Value 5.30% 5.90%
Cost $ 53,347 $ 52,553
Research & Consulting Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 62,841 $ 36,045
Percentage of Net Assets at Fair Value 6.30% 4.10%
Cost $ 62,281 $ 35,309
Industrial Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 48,178 $ 21,599
Percentage of Net Assets at Fair Value 4.80% 2.40%
Cost $ 46,924 $ 21,634
Specialty Retail    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 39,744 $ 38,272
Percentage of Net Assets at Fair Value 4.00% 4.30%
Cost $ 37,496 $ 36,647
Pharmaceuticals, Biotechnology & Life Sciences    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 50,836 $ 24,877
Percentage of Net Assets at Fair Value 5.10% 2.80%
Cost $ 53,584 $ 34,199
Healthcare Products    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 36,709 $ 34,474
Percentage of Net Assets at Fair Value 3.70% 3.90%
Cost $ 37,131 $ 35,087
Education    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 30,244 $ 29,495
Percentage of Net Assets at Fair Value 3.00% 3.30%
Cost $ 42,227 $ 41,443
Restaurants    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 35,318 $ 25,656
Percentage of Net Assets at Fair Value 3.60% 2.90%
Cost $ 35,052 $ 25,329
Telecommunications    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 39,403 $ 19,920
Percentage of Net Assets at Fair Value 4.00% 2.30%
Cost $ 44,378 $ 23,504
Energy Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 22,505 $ 25,022
Percentage of Net Assets at Fair Value 2.30% 2.80%
Cost $ 22,189 $ 25,362
Distribution    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 13,632 $ 11,773
Percentage of Net Assets at Fair Value 1.40% 1.30%
Cost $ 10,753 $ 11,873
Movies & Entertainment    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 21,998 $ 8,690
Percentage of Net Assets at Fair Value 2.20% 1.00%
Cost $ 25,288 $ 8,403
Technology Products & Components    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 8,666 $ 10,378
Percentage of Net Assets at Fair Value 0.90% 1.20%
Cost $ 12,899 $ 13,031
Building & Infrastructure Products    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 7,244 $ 7,522
Percentage of Net Assets at Fair Value 0.70% 0.90%
Cost $ 9,706 $ 8,830
Data Processing & Outsourced Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value   $ 2,093
Percentage of Net Assets at Fair Value   0.20%
Cost   $ 2,071
First Lien Loans, Last Out    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 23,800 23,400
First Lien Loans, Split Lien Term Loans    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 58,800 59,900
Second Lien Loans, Split Lien Term Loans    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value 15,700 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 12.70% 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 9.50% 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 9.40% 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 8.90% 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 6.00% 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 4.10% 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 6.10% 5.00%
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 2.80% 3.30%
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 4.70% 5.30%
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 3.50% 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 | Industrial Products    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Percentage of Total Portfolio at Fair Value 2.70% 4.20%
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 2.80% 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 2.60% 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 3.10% 2.00%
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 2.40% 1.20%
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 2.00% 2.10%
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 2.50% 1.40%
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 1.80% 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 1.50% 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 1.80% 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 2.00% 1.10%
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 1.10% 1.40%
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 | Movies & Entertainment    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Percentage of Total Portfolio at Fair Value 1.10% 0.50%
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 0.40% 0.60%
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 0.30% 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%
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 27.70% 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 20.60% 18.20%
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 19.60% 17.60%
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 17.30% 21.80%
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 13.20% 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 14.00% 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 9.30% 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 9.30% 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 9.40% 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 6.50% 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 3.50% 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 4.30% 3.50%
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 2.70% 3.20%
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 4.90% 5.40%
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 3.70% 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 3.20% 3.70%
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 2.20% 3.70%
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 3.00% 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 2.60% 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 3.10% 2.00%
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 | Specialty Retail    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Percentage of Total Portfolio at Fair Value 1.80% 2.10%
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 2.60% 1.90%
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 1.80% 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 2.10% 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 1.70% 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 2.20% 1.30%
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 1.10% 1.40%
Percentage of Total Portfolio at Cost | Industry | Distribution    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Percentage of Total Portfolio at Fair Value 0.50% 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 1.20% 0.50%
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 0.60% 0.70%
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%
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 27.60% 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 19.50% 17.80%
Percentage of Total Portfolio at Cost | Geographic | Southeast    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Percentage of Total Portfolio at Fair Value 21.30% 19.10%
Percentage of Total Portfolio at Cost | Geographic | West    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Percentage of Total Portfolio at Fair Value 16.80% 20.20%
Percentage of Total Portfolio at Cost | Geographic | Midwest    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Percentage of Total Portfolio at Fair Value 13.30% 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 $ 1,812,469 $ 1,586,622
Percentage of Net Assets at Fair Value 182.00% 179.60%
Cost $ 1,868,322 $ 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 90.00% 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 92.00% 91.50%
Second lien loans    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 16,850 $ 18,066
Percentage of Net Assets at Fair Value 1.70% 2.00%
Cost $ 23,993 $ 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 0.80% 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 1.20% 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 $ 69,048 $ 102,918
Percentage of Net Assets at Fair Value 6.90% 11.60%
Cost $ 77,030 $ 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 3.40% 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 3.70% 4.40%
Common equity & warrants    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair Value $ 109,957 $ 76,475
Percentage of Net Assets at Fair Value 11.10% 8.70%
Cost $ 57,027 $ 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 5.50% 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 2.80% 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 and the investments of Capital Southwest SPV LLC ("SPV"), SBIC I (as defined below) and 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 December 31, 2025, the Company held $1,607.8 million of non-control/non-affiliate investments, which represented approximately 79.9% of the Company’s investment assets. The fair value of these investments as a percent of net assets is 161.4%.
[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] All debt investments are income-producing, unless otherwise noted. Equity investments are non-income producing, unless otherwise noted.
[7] 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%.
[8] 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.
[9] 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.
[10] Unless otherwise noted, all portfolio company headquarters are based in the United States.
[11] As of December 31, 2025, the cumulative gross unrealized appreciation for U.S. federal income tax purposes was approximately $117.6 million; cumulative gross unrealized depreciation for federal income tax purposes was $139.7 million. Cumulative net unrealized depreciation was $22.1 million, based on a tax cost of $2,024.2 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.