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INVESTMENTS - Investment Portfolio, at Fair Value and Cost (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Sep. 30, 2022
Mar. 31, 2022
Mar. 31, 2021
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 1,056,931 [1],[2],[3] $ 936,614 [4],[5],[6]  
Percent of net assets 222.20% [1],[2] 222.50%  
Cost $ 1,064,644 [1],[2],[7],[8] $ 938,303 [4],[5],[9],[10]  
Percentage of Total Portfolio at Fair Value | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 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 100.00% 100.00%  
Percentage of Total Portfolio at Fair Value | Geographic      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 100.00% 100.00%  
Percentage of Total Portfolio at Cost | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 100.00%   100.00%
Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 100.00% 100.00%  
Percentage of Total Portfolio at Cost | Geographic      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 100.00% 100.00%  
First lien loans      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 852,555 $ 739,872  
Percent of net assets 179.20% 175.80%  
Cost $ 867,644 $ 745,290  
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 80.70%   79.00%
First lien loans | Percentage of Total Portfolio at Cost | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 81.50%   79.40%
Second lien loans      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 50,437 $ 52,645  
Percent of net assets 10.60% 12.50%  
Cost $ 55,937 $ 55,976  
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 4.80%   5.60%
Second lien loans | Percentage of Total Portfolio at Cost | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 5.30%   6.00%
Subordinated debt      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 459 $ 1,317  
Percent of net assets 0.10% 0.30%  
Cost $ 1,051 $ 994  
Subordinated debt | Percentage of Total Portfolio at Fair Value | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 0.00%   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 0.10%   0.10%
Preferred equity      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 52,770 $ 44,663  
Percent of net assets 11.10% 10.60%  
Cost $ 34,641 $ 25,544  
Preferred equity | Percentage of Total Portfolio at Fair Value | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 5.00%   4.80%
Preferred equity | Percentage of Total Portfolio at Cost | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 3.30%   2.70%
Common equity & warrants      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 49,813 $ 40,514  
Percent of net assets 10.50% 9.60%  
Cost $ 29,371 $ 34,499  
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 4.70%   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 2.70%   3.70%
I-45 SLF LLC      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 50,897 $ 57,603  
Percent of net assets 10.70% 13.70%  
Cost $ 76,000 $ 76,000  
I-45 SLF LLC | Percentage of Total Portfolio at Fair Value | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 4.80%   6.20%
I-45 SLF LLC | Percentage of Total Portfolio at Cost | Investment Type      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 7.10%   8.10%
West      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 220,070 $ 163,924  
Percent of net assets 46.30% 38.90%  
Cost $ 212,026 $ 153,292  
West | Percentage of Total Portfolio at Fair Value | Geographic      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 20.80% 17.50%  
West | Percentage of Total Portfolio at Cost | Geographic      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 19.90% 16.30%  
Northeast      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 215,895 $ 225,578  
Percent of net assets 45.40% 53.60%  
Cost $ 217,375 $ 221,780  
Northeast | Percentage of Total Portfolio at Fair Value | Geographic      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 20.40% 24.10%  
Northeast | Percentage of Total Portfolio at Cost | Geographic      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 20.40% 23.60%  
Southeast      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 201,142 $ 206,057  
Percent of net assets 42.30% 49.00%  
Cost $ 196,002 $ 204,443  
Southeast | Percentage of Total Portfolio at Fair Value | Geographic      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 19.00% 22.00%  
Southeast | Percentage of Total Portfolio at Cost | Geographic      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 18.50% 21.80%  
Southwest      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 201,022 $ 136,588  
Percent of net assets 42.30% 32.50%  
Cost $ 196,389 $ 138,929  
Southwest | Percentage of Total Portfolio at Fair Value | Geographic      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 19.00% 14.60%  
Southwest | Percentage of Total Portfolio at Cost | Geographic      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 18.40% 14.90%  
Midwest      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 142,460 $ 132,308  
Percent of net assets 29.90% 31.40%  
Cost $ 142,643 $ 129,354  
Midwest | Percentage of Total Portfolio at Fair Value | Geographic      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 13.60% 14.10%  
Midwest | Percentage of Total Portfolio at Cost | Geographic      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 13.40% 13.80%  
I-45 SLF LLC      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 50,897 $ 57,603  
Percent of net assets 10.70% 13.70%  
Cost $ 76,000 $ 76,000  
I-45 SLF LLC | Percentage of Total Portfolio at Fair Value | Geographic      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 4.80% 6.10%  
I-45 SLF LLC | Percentage of Total Portfolio at Cost | Geographic      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 7.10% 8.10%  
International      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 25,445 $ 14,556  
Percent of net assets 5.30% 3.40%  
Cost $ 24,209 $ 14,505  
International | Percentage of Total Portfolio at Fair Value | Geographic      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 2.40% 1.60%  
International | Percentage of Total Portfolio at Cost | Geographic      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 2.30% 1.50%  
Media, Marketing & Entertainment      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 117,181 $ 43,463  
Percent of net assets 24.60% 10.30%  
Cost $ 106,654 $ 33,049  
Media, Marketing & Entertainment | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 11.10% 4.60%  
Media, Marketing & Entertainment | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 10.00% 3.50%  
Healthcare Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 110,388 $ 88,131  
Percent of net assets 23.20% 21.00%  
Cost $ 117,493 $ 96,946  
Healthcare Services | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 10.40% 9.40%  
Healthcare Services | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 11.00% 10.30%  
Business Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 108,172 $ 123,697  
Percent of net assets 22.80% 29.40%  
Cost $ 111,381 $ 124,860  
Business Services | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 10.30% 13.20%  
Business Services | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 10.50% 13.30%  
Consumer Products & Retail      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 89,035 $ 90,457  
Percent of net assets 18.70% 21.50%  
Cost $ 86,863 $ 88,375  
Consumer Products & Retail | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 8.40% 9.70%  
Consumer Products & Retail | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 8.10% 9.40%  
Consumer Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 79,105 $ 71,730  
Percent of net assets 16.60% 17.00%  
Cost $ 78,469 $ 71,203  
Consumer Services | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 7.50% 7.70%  
Consumer Services | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 7.40% 7.60%  
Healthcare Products      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 67,572 $ 32,054  
Percent of net assets 14.20% 7.60%  
Cost $ 68,855 $ 33,018  
Healthcare Products | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 6.40% 3.40%  
Healthcare Products | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 6.50% 3.50%  
Food, Agriculture & Beverage      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 52,064 $ 48,876  
Percent of net assets 11.00% 11.60%  
Cost $ 50,547 $ 47,057  
Food, Agriculture & Beverage | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 4.90% 5.20%  
Food, Agriculture & Beverage | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 4.70% 5.00%  
I-45 SLF LLC      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 50,897 $ 57,603  
Percent of net assets 10.70% 13.70%  
Cost $ 76,000 $ 76,000  
I-45 SLF LLC | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 4.80% 6.20%  
I-45 SLF LLC | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 7.10% 8.10%  
Technology Products & Components      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 49,553 $ 37,047  
Percent of net assets 10.40% 8.80%  
Cost $ 31,861 $ 30,440  
Technology Products & Components | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 4.70% 4.00%  
Technology Products & Components | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 3.00% 3.30%  
Financial Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 39,429 $ 39,305  
Percent of net assets 8.30% 9.30%  
Cost $ 31,087 $ 31,229  
Financial Services | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 3.70% 4.20%  
Financial Services | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 2.90% 3.30%  
Transportation Sector      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 38,650 $ 34,038  
Percent of net assets 8.10% 8.10%  
Cost $ 34,609 $ 29,513  
Transportation Sector | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 3.70% 3.60%  
Transportation Sector | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 3.30% 3.10%  
Distribution      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 34,632 $ 54,798  
Percent of net assets 7.30% 13.00%  
Cost $ 36,217 $ 54,035  
Distribution | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 3.30% 5.90%  
Distribution | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 3.40% 5.80%  
Software & IT Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 32,826 $ 33,414  
Percent of net assets 6.90% 7.90%  
Cost $ 34,212 $ 34,866  
Software & IT Services | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 3.10% 3.60%  
Software & IT Services | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 3.20% 3.70%  
Education      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 26,292 $ 32,072  
Percent of net assets 5.50% 7.60%  
Cost $ 32,037 $ 32,119  
Education | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 2.50% 3.40%  
Education | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 3.00% 3.40%  
Energy Services (Midstream)      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 22,503 $ 13,465  
Percent of net assets 4.70% 3.20%  
Cost $ 23,190 $ 13,582  
Energy Services (Midstream) | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 2.10% 1.40%  
Energy Services (Midstream) | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 2.20% 1.50%  
Industrial Products      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 20,869 $ 13,891  
Percent of net assets 4.40% 3.30%  
Cost $ 18,824 $ 13,901  
Industrial Products | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 2.00% 1.50%  
Industrial Products | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 1.80% 1.50%  
Energy Services (Upstream)      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 19,820 $ 17,910  
Percent of net assets 4.20% 4.30%  
Cost $ 19,450 $ 17,500  
Energy Services (Upstream) | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 1.90% 1.90%  
Energy Services (Upstream) | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 1.80% 1.90%  
Environmental Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 19,469 $ 20,641  
Percent of net assets 4.10% 4.90%  
Cost $ 25,542 $ 23,108  
Environmental Services | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 1.80% 2.20%  
Environmental Services | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 2.40% 2.50%  
Telecommunications      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 19,006 $ 18,736  
Percent of net assets 4.00% 4.50%  
Cost $ 22,281 $ 22,341  
Telecommunications | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 1.80% 2.00%  
Telecommunications | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 2.10% 2.40%  
Specialty Chemicals      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 17,929 $ 17,749  
Percent of net assets 3.80% 4.20%  
Cost $ 17,585 $ 17,640  
Specialty Chemicals | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 1.70% 1.90%  
Specialty Chemicals | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 1.70% 1.90%  
Industrial Services      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 11,556 $ 11,614  
Percent of net assets 2.40% 2.80%  
Cost $ 11,409 $ 11,451  
Industrial Services | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 1.10% 1.20%  
Industrial Services | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 1.10% 1.20%  
Commodities & Mining      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 11,437 $ 10,877  
Percent of net assets 2.40% 2.60%  
Cost $ 11,387 $ 11,135  
Commodities & Mining | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 1.10% 1.20%  
Commodities & Mining | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 1.10% 1.20%  
Containers & Packaging      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 10,737 $ 10,671  
Percent of net assets 2.30% 2.50%  
Cost $ 10,689 $ 10,723  
Containers & Packaging | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 1.00% 1.10%  
Containers & Packaging | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 1.00% 1.10%  
Aerospace & Defense      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 6,800 $ 6,800  
Percent of net assets 1.40% 1.60%  
Cost $ 6,685 $ 6,672  
Aerospace & Defense | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 0.60% 0.70%  
Aerospace & Defense | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 0.60% 0.70%  
Restaurants      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 1,009 $ 5,367  
Percent of net assets 0.20% 1.30%  
Cost $ 1,317 $ 4,556  
Restaurants | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 0.10% 0.60%  
Restaurants | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio 0.10% 0.50%  
Paper & Forest Products Sector      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value   $ 2,208  
Percent of net assets   0.50%  
Cost   $ 2,984  
Paper & Forest Products Sector | Percentage of Total Portfolio at Fair Value | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio   0.20%  
Paper & Forest Products Sector | Percentage of Total Portfolio at Cost | Industry      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of Total Portfolio   0.30%  
First lien last out loans      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 46,500 $ 38,600  
Split lien term loans included in first lien loans      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value 37,300 36,400  
Split lien term loans included in second lien loans      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value 33,500 33,900  
Unsecured convertible Note      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Investments at fair value $ 500 $ 700  
[1] All debt investments are income-producing, unless otherwise noted. Equity investments are non-income producing, unless otherwise noted.
[2] 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.
[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 Board of Directors, using significant unobservable Level 3 inputs. Refer to Note 4 for further discussion.
[4] All debt investments are income-producing, unless otherwise noted. Equity investments and warrants are non-income producing, unless otherwise noted.
[5] 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.
[6] 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 Board of Directors, using significant unobservable Level 3 inputs. Refer to Note 4 for further discussion.
[7] As of September 30, 2022, the cumulative gross unrealized appreciation for U.S. federal income tax purposes is approximately $58.9 million; cumulative gross unrealized depreciation for federal income tax purposes is $62.8 million. Cumulative net unrealized depreciation is $3.9 million, based on a tax cost of $1,060.8 million.
[8] Negative cost in this column represents the original issue discount of certain undrawn revolvers and delayed draw term loans.
[9] As of March 31, 2022, the cumulative gross unrealized appreciation for U.S. federal income tax purposes is approximately $67.8 million; cumulative gross unrealized depreciation for federal income tax purposes is $61.7 million. Cumulative net unrealized appreciation is $6.1 million, based on a tax cost of $852.4 million.
[10] Represents amortized cost. Negative cost in this column represents the original issue discount of certain undrawn revolvers and delayed draw term loans.