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FAIR VALUE MEASUREMENTS - Schedule Investment Portfolio by Level (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Mar. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investment owned, fair value | $ 1,353,566 | [1],[2],[3] | $ 1,206,388 | [4],[5],[6]
Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investment owned, fair value | 1,300,144 |  |  |
Total Investments |  |  | 1,155,132 |
Recurring |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Total Investments | 1,353,566 |  | 1,206,388 |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Total Investments | 0 |  | 0 |
Recurring | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Total Investments | 0 |  | 0 |
Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Total Investments | 1,300,144 |  | 1,155,132 |
Recurring | Net Asset Value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investments measured at net asset value | $ 53,422 |  | 51,256 |
Prior notice period to sell or transfer membership interest | 60 days |  |  |
Recurring | First lien loans |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investment owned, fair value | $ 1,141,280 |  | 1,000,984 |
Recurring | First lien loans | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investment owned, fair value | 0 |  | 0 |
Recurring | First lien loans | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investment owned, fair value | 0 |  | 0 |
Recurring | First lien loans | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investment owned, fair value | 1,141,280 |  | 1,000,984 |
Recurring | Second lien loans |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investment owned, fair value | 37,034 |  | 35,820 |
Recurring | Second lien loans | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investment owned, fair value | 0 |  | 0 |
Recurring | Second lien loans | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investment owned, fair value | 0 |  | 0 |
Recurring | Second lien loans | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investment owned, fair value | 37,034 |  | 35,820 |
Recurring | Subordinated debt |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investment owned, fair value | 760 |  | 791 |
Recurring | Subordinated debt | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investment owned, fair value | 0 |  | 0 |
Recurring | Subordinated debt | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investment owned, fair value | 0 |  | 0 |
Recurring | Subordinated debt | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investment owned, fair value | 760 |  | 791 |
Recurring | Preferred equity |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investment owned, fair value | 66,440 |  | 63,393 |
Recurring | Preferred equity | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investment owned, fair value | 0 |  | 0 |
Recurring | Preferred equity | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investment owned, fair value | 0 |  | 0 |
Recurring | Preferred equity | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investment owned, fair value | 66,440 |  | 63,393 |
Recurring | Common equity & warrants |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investment owned, fair value | 54,630 |  | 54,144 |
Recurring | Common equity & warrants | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investment owned, fair value | 0 |  | 0 |
Recurring | Common equity & warrants | Significant Other Observable Inputs (Level 2) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investment owned, fair value | 0 |  | 0 |
Recurring | Common equity & warrants | Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investment owned, fair value | $ 54,630 |  | $ 54,144 |
[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 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] | All debt investments are income-producing, unless otherwise noted. Equity investments 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 - Fair Value Measurements to our audited consolidated financial statements for further discussion.

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