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FAIR VALUE MEASUREMENTS - Measurement Inputs and Valuation Techniques (Details) $ in Thousands | Sep. 30, 2024 USD ($) | Mar. 31, 2024 USD ($)
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Fair Value |  |  |  |
Investments at fair value | $ 1,508,507 | [1],[2],[3],[4],[5],[6],[7] | $ 1,476,561 | [8],[9],[10],[11],[12],[13],[14]
Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value |  |  |  |
Investments at fair value | 1,508,507 |  | 1,476,561 |
Significant Unobservable Inputs (Level 3) | First lien loans | Income Approach |  |  |  |
Fair Value |  |  |  |
Investments at fair value | $ 1,284,492 |  | $ 1,211,447 |
Significant Unobservable Inputs (Level 3) | First lien loans | Income Approach | Minimum | Discount Rate |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.055 |  | 0.055 |
Significant Unobservable Inputs (Level 3) | First lien loans | Income Approach | Minimum | Third Party Broker Quote |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.275 |  | 0.383 |
Significant Unobservable Inputs (Level 3) | First lien loans | Income Approach | Maximum | Discount Rate |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.504 |  | 0.438 |
Significant Unobservable Inputs (Level 3) | First lien loans | Income Approach | Maximum | Third Party Broker Quote |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.999 |  | 1.000 |
Significant Unobservable Inputs (Level 3) | First lien loans | Income Approach | Weighted Average | Discount Rate |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.136 |  | 0.134 |
Significant Unobservable Inputs (Level 3) | First lien loans | Income Approach | Weighted Average | Third Party Broker Quote |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.924 |  | 0.924 |
Significant Unobservable Inputs (Level 3) | First lien loans | Market Approach |  |  |  |
Fair Value |  |  |  |
Investments at fair value | $ 59,763 |  | $ 98,002 |
Significant Unobservable Inputs (Level 3) | First lien loans | Market Approach | Minimum | Cost |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.978 |  | 0.980 |
Significant Unobservable Inputs (Level 3) | First lien loans | Market Approach | Minimum | Exit Value |  |  |  |
Significant Unobservable Inputs |  |  |  |
Investments, measurement input | 0.925 |  |  |
Significant Unobservable Inputs (Level 3) | First lien loans | Market Approach | Maximum | Cost |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.985 |  | 0.990 |
Significant Unobservable Inputs (Level 3) | First lien loans | Market Approach | Maximum | Exit Value |  |  |  |
Significant Unobservable Inputs |  |  |  |
Investments, measurement input | 0.925 |  |  |
Significant Unobservable Inputs (Level 3) | First lien loans | Market Approach | Weighted Average | Cost |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.982 |  | 0.981 |
Significant Unobservable Inputs (Level 3) | First lien loans | Market Approach | Weighted Average | Exit Value |  |  |  |
Significant Unobservable Inputs |  |  |  |
Investments, measurement input | 0.925 |  |  |
Significant Unobservable Inputs (Level 3) | First lien loans | Enterprise Value Waterfall Approach |  |  |  |
Fair Value |  |  |  |
Investments at fair value | $ 1,134 |  |  |
Significant Unobservable Inputs (Level 3) | First lien loans | Enterprise Value Waterfall Approach | Minimum | Discount Rate |  |  |  |
Significant Unobservable Inputs |  |  |  |
Investments, measurement input | 0.450 |  |  |
Significant Unobservable Inputs (Level 3) | First lien loans | Enterprise Value Waterfall Approach | Minimum | EBITDA Multiple |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 9.0 |  |  |
Significant Unobservable Inputs (Level 3) | First lien loans | Enterprise Value Waterfall Approach | Maximum | Discount Rate |  |  |  |
Significant Unobservable Inputs |  |  |  |
Investments, measurement input | 0.450 |  |  |
Significant Unobservable Inputs (Level 3) | First lien loans | Enterprise Value Waterfall Approach | Maximum | EBITDA Multiple |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 9.0 |  |  |
Significant Unobservable Inputs (Level 3) | First lien loans | Enterprise Value Waterfall Approach | Weighted Average | Discount Rate |  |  |  |
Significant Unobservable Inputs |  |  |  |
Investments, measurement input | 0.450 |  |  |
Significant Unobservable Inputs (Level 3) | First lien loans | Enterprise Value Waterfall Approach | Weighted Average | EBITDA Multiple |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 9.0 |  |  |
Significant Unobservable Inputs (Level 3) | Second lien loans | Income Approach |  |  |  |
Fair Value |  |  |  |
Investments at fair value | $ 27,372 |  | $ 33,774 |
Significant Unobservable Inputs (Level 3) | Second lien loans | Income Approach | Minimum | Discount Rate |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.092 |  | 0.134 |
Significant Unobservable Inputs (Level 3) | Second lien loans | Income Approach | Minimum | Third Party Broker Quote |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs |  |  | 0.280 |
Significant Unobservable Inputs (Level 3) | Second lien loans | Income Approach | Maximum | Discount Rate |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.285 |  | 0.333 |
Significant Unobservable Inputs (Level 3) | Second lien loans | Income Approach | Maximum | Third Party Broker Quote |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs |  |  | 0.280 |
Significant Unobservable Inputs (Level 3) | Second lien loans | Income Approach | Weighted Average | Discount Rate |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.119 |  | 0.156 |
Significant Unobservable Inputs (Level 3) | Second lien loans | Income Approach | Weighted Average | Third Party Broker Quote |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs |  |  | 0.280 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Income Approach |  |  |  |
Fair Value |  |  |  |
Investments at fair value | $ 588 |  | $ 568 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Income Approach | Minimum | Discount Rate |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.193 |  | 0.187 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Income Approach | Minimum | Third Party Broker Quote |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.250 |  | 0.233 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Income Approach | Maximum | Discount Rate |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.193 |  | 0.187 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Income Approach | Maximum | Third Party Broker Quote |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.250 |  | 0.233 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Income Approach | Weighted Average | Discount Rate |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.193 |  | 0.187 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Income Approach | Weighted Average | Third Party Broker Quote |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.250 |  | 0.233 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Market Approach |  |  |  |
Fair Value |  |  |  |
Investments at fair value | $ 134 |  | $ 210 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Market Approach | Minimum | Cost |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 1.000 |  | 0.940 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Market Approach | Maximum | Cost |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 1.000 |  | 1.000 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Market Approach | Weighted Average | Cost |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 1.000 |  | 0.961 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Enterprise Value Waterfall Approach |  |  |  |
Fair Value |  |  |  |
Investments at fair value | $ 558 |  | $ 558 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Enterprise Value Waterfall Approach | Minimum | Discount Rate |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.128 |  | 0.132 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Enterprise Value Waterfall Approach | Minimum | EBITDA Multiple |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 5.9 |  | 5.7 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Enterprise Value Waterfall Approach | Maximum | Discount Rate |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.169 |  | 0.186 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Enterprise Value Waterfall Approach | Maximum | EBITDA Multiple |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 7.6 |  | 7.9 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Enterprise Value Waterfall Approach | Weighted Average | Discount Rate |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.141 |  | 0.148 |
Significant Unobservable Inputs (Level 3) | Subordinated debt | Enterprise Value Waterfall Approach | Weighted Average | EBITDA Multiple |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 6.4 |  | 6.4 |
Significant Unobservable Inputs (Level 3) | Preferred equity | Market Approach |  |  |  |
Fair Value |  |  |  |
Investments at fair value | $ 975 |  | $ 2,250 |
Significant Unobservable Inputs (Level 3) | Preferred equity | Market Approach | Minimum | Cost |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 1.000 |  | 1.000 |
Significant Unobservable Inputs (Level 3) | Preferred equity | Market Approach | Maximum | Cost |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 1.000 |  | 1.000 |
Significant Unobservable Inputs (Level 3) | Preferred equity | Market Approach | Weighted Average | Cost |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 1.000 |  | 1.000 |
Significant Unobservable Inputs (Level 3) | Preferred equity | Enterprise Value Waterfall Approach |  |  |  |
Fair Value |  |  |  |
Investments at fair value | $ 73,577 |  | $ 68,877 |
Significant Unobservable Inputs (Level 3) | Preferred equity | Enterprise Value Waterfall Approach | Minimum | Discount Rate |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.111 |  | 0.103 |
Significant Unobservable Inputs (Level 3) | Preferred equity | Enterprise Value Waterfall Approach | Minimum | EBITDA Multiple |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 4.3 |  | 4.3 |
Significant Unobservable Inputs (Level 3) | Preferred equity | Enterprise Value Waterfall Approach | Maximum | Discount Rate |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.450 |  | 0.380 |
Significant Unobservable Inputs (Level 3) | Preferred equity | Enterprise Value Waterfall Approach | Maximum | EBITDA Multiple |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 17.0 |  | 17.0 |
Significant Unobservable Inputs (Level 3) | Preferred equity | Enterprise Value Waterfall Approach | Weighted Average | Discount Rate |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.146 |  | 0.167 |
Significant Unobservable Inputs (Level 3) | Preferred equity | Enterprise Value Waterfall Approach | Weighted Average | EBITDA Multiple |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 9.1 |  | 9.9 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Market Approach |  |  |  |
Fair Value |  |  |  |
Investments at fair value |  |  | $ 500 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Market Approach | Minimum | Cost |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs |  |  | 1.000 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Market Approach | Maximum | Cost |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs |  |  | 1.000 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Market Approach | Weighted Average | Cost |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs |  |  | 1.000 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Enterprise Value Waterfall Approach |  |  |  |
Fair Value |  |  |  |
Investments at fair value | $ 59,914 |  | $ 60,375 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Enterprise Value Waterfall Approach | Minimum | Discount Rate |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.109 |  | 0.103 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Enterprise Value Waterfall Approach | Minimum | EBITDA Multiple |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 4.2 |  | 4.7 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Enterprise Value Waterfall Approach | Maximum | Discount Rate |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.246 |  | 0.302 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Enterprise Value Waterfall Approach | Maximum | EBITDA Multiple |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 16.9 |  | 15.6 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Enterprise Value Waterfall Approach | Weighted Average | Discount Rate |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 0.152 |  | 0.16 |
Significant Unobservable Inputs (Level 3) | Common equity & warrants | Enterprise Value Waterfall Approach | Weighted Average | EBITDA Multiple |  |  |  |
Significant Unobservable Inputs |  |  |  |
Significant Level 3 Inputs | 8.1 |  | 8.6 |
[1] | 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.
[2] | Unless otherwise noted, all portfolio company headquarters are based in the United States.
[3] | Affiliate investments are generally defined by the 1940 Act as investments in which between 5% and 25% of the voting securities are owned and the investments are not classified as control investments. At September 30, 2024, the Company held $201.9 million of affiliate investments, which represented approximately 13.4% of the Company’s investment assets. The fair value of these investments as a percent of net assets is 25.5%.
[4] | All debt investments are income-producing, unless otherwise noted. Equity investments are non-income producing, unless otherwise noted.
[5] | Control investments are generally defined by the 1940 Act as investments in which more than 25% of the voting securities are owned. At September 30, 2024, the Company held $9.4 million of control investments, which represented approximately 0.6% of the Company's investment assets. The fair value of these investments as a percent of net assets is 1.2%.
[6] | Non-Control/Non-Affiliate investments are generally defined by the 1940 Act as investments that are neither control investments nor affiliate investments. At September 30, 2024, the Company held $1,297.3 million of non-control/non-affiliate investments, which represented approximately 86.0% of the Company’s investment assets. The fair value of these investments as a percent of net assets is 163.9%.
[7] | 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.
[8] | 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.
[9] | Unless otherwise noted, all portfolio company headquarters are based in the United States.
[10] | Affiliate investments are generally defined by the 1940 Act as investments in which between 5% and 25% of the voting securities are owned and the investments are not classified as control investments. At March 31, 2024, the Company held $190.2 million of affiliate investments, which represented approximately 12.9% of the Company’s investment assets. The fair value of these investments as a percent of net assets is 25.2%.
[11] | All debt investments are income-producing, unless otherwise noted. Equity investments are non-income producing, unless otherwise noted.
[12] | Control investments are generally defined by the 1940 Act as investments in which more than 25% of the voting securities are owned. At March 31, 2024, the Company did not hold any control investments.
[13] | Non-Control/Non-Affiliate investments are generally defined by the 1940 Act, as investments that are neither control investments nor affiliate investments. At March 31, 2024, the Company held $1,286.4 million of non-control/non-affiliate investments, which represented approximately 87.1% of the Company’s investment assets. The fair value of these investments as a percent of net assets is 170.2%.
[14] | 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.

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