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RELATED PARTY TRANSACTIONS - Narrative (Details) - USD ($) | 6 Months Ended | 12 Months Ended | 24 Months Ended | 36 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014 | Mar. 31, 2022 | Mar. 31, 2023
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base management fee |  | 1.75% |  |  |  |  |  |  |  |  |  |  |  |
Base management fee, percent fee |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Investment company, excess expense reimbursable |  | $ 0 |  | $ 8,000 | $ 100,000 |  |  |  |  |  |  |  |  |
Management and service fee, net of credit |  | 0.50% |  | 0.50% |  |  |  |  |  |  |  |  |  |
Management and service fees, loans |  | 1.50% |  |  |  |  |  |  |  |  |  |  |  |
Ratio of net investment income (loss) to average net assets – annualized |  | 8.49% |  | 6.61% | 6.40% | 6.11% | 6.74% | 6.41% | 6.13% | 6.90% | 5.55% | 6.37% |  |
Incentive fee base on minimum rate of return required on investment |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of pre-incentive fee net investment income is less than the hurdle rate |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Investment company, pre-incentive fee net investment income, percent threshold of net assets | 2.1875% |  | 2.50% |  |  |  |  |  |  |  |  |  | 2.4375% |
Pre-incentive fee net investment income exceeds the hurdle rate |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |
Investment company, capital gains-based incentive fees | 20.00% | 20.00% |  |  |  |  |  |  |  |  |  |  |  |
Investment company, net investment income to common stockholder distributions ratio, threshold |  | 100.00% |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |
Incentive fee credit |  | $ 0 |  | $ 437,000 | $ 451,000 |  |  |  |  |  |  |  |  |
Success fee income |  | 935,000 |  | 4,794,000 | 202,000 |  |  |  |  |  |  |  |  |
Investment company, other operating expenses, due to advisor | $ 65,000 | 65,000 |  | 44,000 |  |  |  |  |  |  |  |  |  |
Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Success fee income |  | 800,000 |  | 1,100,000 | $ 800,000 |  |  |  |  |  |  |  |  |
Fees due to related party | 4,351,000 | 4,351,000 |  | 2,527,000 |  |  |  |  |  |  |  |  |  |
Related Party | Gladstone Investment Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees due to related party | $ 19,000 | $ 19,000 |  | $ 13,000 |  |  |  |  |  |  |  |  |  |
Adviser | Related Party | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Administrator | Related Party | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Gladstone Securities, LLC | Related Party | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base management fee |  | 1.75% |  |  |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ratio of net investment income (loss) to average net assets – annualized | 1.75% |  |  |  |  |  |  |  |  |  |  |  |  | 2.00%

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