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RELATED PARTY TRANSACTIONS - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 36 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Mar. 31, 2023 | Mar. 31, 2023 | Sep. 30, 2023
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Base management fee | 1.75% | 1.75% | 1.75% | 1.75% |  |  |
Base management fee, percent fee |  |  | 100.00% |  |  |  |
Management and service fee, net of credit | 0.50% | 0.50% | 0.50% | 0.50% |  |  |
Management and service fees, loans |  |  | 1.50% |  |  |  |
Ratio of net investment income (loss) to average net assets – annualized | 8.74% | 8.77% | 8.13% | 8.32% |  |  |
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% |  |
Pre-incentive fee net investment income exceeds the hurdle rate |  |  | 20.00% |  |  |  |
Investment company, capital gains-based incentive fees | 20.00% |  | 20.00% |  |  |  |
Capital gains-based incentive fees paid to the adviser |  |  | $ 0 |  |  |  |
Capital gains-based incentive fee | $ 0 |  | 0 |  |  |  |
Investment company, other operating expenses, due to advisor | $ 85,000 |  | $ 85,000 |  |  |  | $ 65,000
Gladstone Securities |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Selling commissions, percentage | 7.00% |  | 7.00% |  |  |  |
Dealer manager fees percentage | 3.00% |  | 3.00% |  |  |  |
Payments for selling commissions and dealer-manager fees | $ 400,000 | $ 0 | $ 600,000 | $ 0 |  |  |
Related Party |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Success fee income | 200,000 | $ 500,000 | 300,000 | $ 800,000 |  |  |
Fee due to related party | 4,994,000 |  | 4,994,000 |  |  |  | 4,351,000
Related Party | Gladstone Investment Corporation |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Fee due to related party | $ 58,000 |  | $ 58,000 |  |  |  | $ 19,000
Adviser | Chief Executive Officer | Related Party |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent | 100.00% |  | 100.00% |  |  |  |
Administrator | Chief Executive Officer | Related Party |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent | 100.00% |  | 100.00% |  |  |  |
Gladstone Securities, LLC | Chief Executive Officer | Related Party |  |  |  |  |  |  |
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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