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FAIR VALUE MEASUREMENTS - Measurement Inputs and Valuation Techniques (Details) $ in Thousands | Dec. 31, 2022 USD ($) | Mar. 31, 2022 USD ($)
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Fair Value |  |  |  |
Total Investments | $ 1,150,046 | [1],[2],[3] | $ 936,614 | [4],[5],[6]
Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value |  |  |  |
Total Investments | 1,102,421 |  |  |
Significant Unobservable Inputs (Level 3) | First lien loans | Income Approach |  |  |  |
Fair Value |  |  |  |
Total Investments | $ 865,983 |  | $ 645,034 |
Significant Unobservable Inputs (Level 3) | First lien loans | Income Approach | Minimum | Discount Rate |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 0.069 |  | 0.073 |
Significant Unobservable Inputs (Level 3) | First lien loans | Income Approach | Minimum | Third Party Broker Quote |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 5.6 |  | 5.5 |
Significant Unobservable Inputs (Level 3) | First lien loans | Income Approach | Maximum | Discount Rate |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 0.381 |  | 0.306 |
Significant Unobservable Inputs (Level 3) | First lien loans | Income Approach | Maximum | Third Party Broker Quote |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 98.5 |  | 96.5 |
Significant Unobservable Inputs (Level 3) | First lien loans | Income Approach | Weighted Average | Discount Rate |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 0.132 |  | 0.107 |
Significant Unobservable Inputs (Level 3) | First lien loans | Income Approach | Weighted Average | Third Party Broker Quote |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 95.5 |  | 93.2 |
Significant Unobservable Inputs (Level 3) | First lien loans | Market Approach |  |  |  |
Fair Value |  |  |  |
Total Investments | $ 88,017 |  | $ 94,838 |
Significant Unobservable Inputs (Level 3) | First lien loans | Market Approach | Minimum | Cost |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 98.0 |  | 80.2 |
Significant Unobservable Inputs (Level 3) | First lien loans | Market Approach | Minimum | Exit Value |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 75.0 |  | 100.0 |
Significant Unobservable Inputs (Level 3) | First lien loans | Market Approach | Maximum | Cost |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 99.5 |  | 99.0 |
Significant Unobservable Inputs (Level 3) | First lien loans | Market Approach | Maximum | Exit Value |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 100.0 |  | 102.0 |
Significant Unobservable Inputs (Level 3) | First lien loans | Market Approach | Weighted Average | Cost |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 98.2 |  | 98.1 |
Significant Unobservable Inputs (Level 3) | First lien loans | Market Approach | Weighted Average | Exit Value |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 95.7 |  | 101.8 |
Significant Unobservable Inputs (Level 3) | Second lien loans | Income Approach |  |  |  |
Fair Value |  |  |  |
Total Investments | $ 33,071 |  | $ 49,541 |
Significant Unobservable Inputs (Level 3) | Second lien loans | Income Approach | Minimum | Discount Rate |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 0.142 |  | 0.103 |
Significant Unobservable Inputs (Level 3) | Second lien loans | Income Approach | Minimum | Third Party Broker Quote |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 66.0 |  | 97.3 |
Significant Unobservable Inputs (Level 3) | Second lien loans | Income Approach | Maximum | Discount Rate |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 0.290 |  | 0.378 |
Significant Unobservable Inputs (Level 3) | Second lien loans | Income Approach | Maximum | Third Party Broker Quote |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 66.0 |  | 97.3 |
Significant Unobservable Inputs (Level 3) | Second lien loans | Income Approach | Weighted Average | Discount Rate |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 0.219 |  | 0.154 |
Significant Unobservable Inputs (Level 3) | Second lien loans | Income Approach | Weighted Average | Third Party Broker Quote |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 66.0 |  | 97.3 |
Significant Unobservable Inputs (Level 3) | Second lien loans | Market Approach |  |  |  |
Fair Value |  |  |  |
Total Investments | $ 2,375 |  |  |
Significant Unobservable Inputs (Level 3) | Second lien loans | Market Approach | Minimum | Exit Value |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 45.6 |  |  |
Significant Unobservable Inputs (Level 3) | Second lien loans | Market Approach | Maximum | Exit Value |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 45.6 |  |  |
Significant Unobservable Inputs (Level 3) | Second lien loans | Market Approach | Weighted Average | Exit Value |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 45.6 |  |  |
Significant Unobservable Inputs (Level 3) | Second lien loans | Enterprise Value Waterfall Approach |  |  |  |
Fair Value |  |  |  |
Total Investments |  |  | $ 3,104 |
Significant Unobservable Inputs (Level 3) | Second lien loans | Enterprise Value Waterfall Approach | Minimum | Discount Rate |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input |  |  | 0.221 |
Significant Unobservable Inputs (Level 3) | Second lien loans | Enterprise Value Waterfall Approach | Minimum | EBITDA Multiple |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input |  |  | 8.3 |
Significant Unobservable Inputs (Level 3) | Second lien loans | Enterprise Value Waterfall Approach | Maximum | Discount Rate |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input |  |  | 0.221 |
Significant Unobservable Inputs (Level 3) | Second lien loans | Enterprise Value Waterfall Approach | Maximum | EBITDA Multiple |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input |  |  | 8.3 |
Significant Unobservable Inputs (Level 3) | Second lien loans | Enterprise Value Waterfall Approach | Weighted Average | Discount Rate |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input |  |  | 0.221 |
Significant Unobservable Inputs (Level 3) | Second lien loans | Enterprise Value Waterfall Approach | Weighted Average | EBITDA Multiple |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input |  |  | 8.3 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Income Approach |  |  |  |
Fair Value |  |  |  |
Total Investments |  |  | $ 650 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Income Approach | Minimum | Discount Rate |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input |  |  | 0.274 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Income Approach | Maximum | Discount Rate |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input |  |  | 0.274 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Income Approach | Weighted Average | Discount Rate |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input |  |  | 0.274 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Market Approach |  |  |  |
Fair Value |  |  |  |
Total Investments | $ 581 |  | $ 172 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Market Approach | Minimum | Cost |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 100.0 |  | 100.0 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Market Approach | Maximum | Cost |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 100.0 |  | 100.0 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Market Approach | Weighted Average | Cost |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 1.000 |  | 100.0 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Enterprise Value Waterfall Approach |  |  |  |
Fair Value |  |  |  |
Total Investments | $ 271 |  | $ 495 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Enterprise Value Waterfall Approach | Minimum | Discount Rate |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 0.210 |  | 0.205 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Enterprise Value Waterfall Approach | Minimum | EBITDA Multiple |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 7.6 |  | 8.1 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Enterprise Value Waterfall Approach | Maximum | Discount Rate |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 0.210 |  | 0.205 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Enterprise Value Waterfall Approach | Maximum | EBITDA Multiple |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 7.6 |  | 8.1 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Enterprise Value Waterfall Approach | Weighted Average | Discount Rate |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 0.210 |  | 0.205 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Enterprise Value Waterfall Approach | Weighted Average | EBITDA Multiple |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 7.6 |  | 8.1 |
Significant Unobservable Inputs (Level 3) | Preferred equity | Market Approach |  |  |  |
Fair Value |  |  |  |
Total Investments |  |  | $ 3,100 |
Significant Unobservable Inputs (Level 3) | Preferred equity | Market Approach | Minimum | Cost |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input |  |  | 100.0 |
Significant Unobservable Inputs (Level 3) | Preferred equity | Market Approach | Maximum | Cost |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input |  |  | 100.0 |
Significant Unobservable Inputs (Level 3) | Preferred equity | Market Approach | Weighted Average | Cost |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input |  |  | 100.0 |
Significant Unobservable Inputs (Level 3) | Preferred equity | Enterprise Value Waterfall Approach |  |  |  |
Fair Value |  |  |  |
Total Investments | $ 61,283 |  | $ 41,563 |
Significant Unobservable Inputs (Level 3) | Preferred equity | Enterprise Value Waterfall Approach | Minimum | Discount Rate |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 0.126 |  | 0.125 |
Significant Unobservable Inputs (Level 3) | Preferred equity | Enterprise Value Waterfall Approach | Minimum | EBITDA Multiple |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 4.7 |  | 6.9 |
Significant Unobservable Inputs (Level 3) | Preferred equity | Enterprise Value Waterfall Approach | Maximum | Discount Rate |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 0.301 |  | 0.408 |
Significant Unobservable Inputs (Level 3) | Preferred equity | Enterprise Value Waterfall Approach | Maximum | EBITDA Multiple |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 17.1 |  | 18.8 |
Significant Unobservable Inputs (Level 3) | Preferred equity | Enterprise Value Waterfall Approach | Weighted Average | Discount Rate |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 0.186 |  | 0.178 |
Significant Unobservable Inputs (Level 3) | Preferred equity | Enterprise Value Waterfall Approach | Weighted Average | EBITDA Multiple |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 10.1 |  | 10.6 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Income Approach |  |  |  |
Fair Value |  |  |  |
Total Investments |  |  | $ 2,090 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Income Approach | Minimum | Third Party Broker Quote |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input |  |  | 158.7 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Income Approach | Maximum | Third Party Broker Quote |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input |  |  | 158.7 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Income Approach | Weighted Average | Third Party Broker Quote |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input |  |  | 158.7 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Market Approach |  |  |  |
Fair Value |  |  |  |
Total Investments | $ 2,615 |  | $ 1,757 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Market Approach | Minimum | Cost |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 100.0 |  |  |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Market Approach | Minimum | Exit Value |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input |  |  | 351.4 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Market Approach | Maximum | Cost |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 100.0 |  |  |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Market Approach | Maximum | Exit Value |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input |  |  | 351.4 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Market Approach | Weighted Average | Cost |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 100.0 |  |  |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Market Approach | Weighted Average | Exit Value |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input |  |  | 351.4 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Enterprise Value Waterfall Approach |  |  |  |
Fair Value |  |  |  |
Total Investments | $ 48,225 |  | $ 36,667 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Enterprise Value Waterfall Approach | Minimum | Discount Rate |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 0.113 |  | 0.101 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Enterprise Value Waterfall Approach | Minimum | EBITDA Multiple |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 5.5 |  | 4.2 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Enterprise Value Waterfall Approach | Maximum | Discount Rate |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 0.784 |  | 0.322 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Enterprise Value Waterfall Approach | Maximum | EBITDA Multiple |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 11.0 |  | 11.4 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Enterprise Value Waterfall Approach | Weighted Average | Discount Rate |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 0.168 |  | 0.181 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Enterprise Value Waterfall Approach | Weighted Average | EBITDA Multiple |  |  |  |
Fair​ Value Measurement Input |  |  |  |
Investments, measurement input | 9.3 |  | 8.5 |
[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 - Fair Value Measurements 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.

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- Definition Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 50 -Paragraph 6 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5D -Subparagraph (SX 210.12-13D(Column C)) -URI https://asc.fasb.org/extlink&oid=122147990&loc=SL120429264-123010 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column C)) -URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010 + Details
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