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AGREEMENTS AND RELATED PARTY TRANSACTIONS (Details) |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2025 USD ($) | May 08, 2025 USD ($) | Feb. 25, 2022 USD ($) | Jan. 01, 2021 qtr | Dec. 23, 2020 USD ($) | Aug. 02, 2018 | Sep. 30, 2025 USD ($) component | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) component | Sep. 30, 2024 USD ($) | Dec. 31, 2018 | Dec. 31, 2024 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Look-back period provision | qtr |  |  |  | 12 |  |  |  |  |  |  |  |
Base management fee |  |  |  |  |  |  | $ 8,415,000 | $ 8,046,000 | $ 24,626,000 | $ 24,515,000 |  |
Base management fees payable |  |  |  |  |  |  | 8,415,000 |  | 8,415,000 |  |  | $ 7,888,000
Incentive management fees |  |  |  |  |  |  | 5,634,000 | 6,597,000 | 24,489,000 | 15,886,000 |  |
Incentive management fees payable |  |  |  |  |  |  | 5,634,000 |  | 5,634,000 |  |  | 7,871,000
Administrative fees expenses |  |  |  |  |  |  | 400,000 | 400,000 | 1,100,000 | 1,400,000 |  |
Administrative fees payable |  |  |  |  |  |  | 351,000 |  | 351,000 |  |  | $ 540,000
Proceeds from termination of CSA |  |  |  |  |  |  |  |  | 23,000,000 | 0 |  |
Gain on credit support agreement |  |  |  |  |  |  | $ 0 | 0 | 9,400,000 | 0 |  |
Barings LLC | MVC Credit Support Agreement |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Expected proceeds from termination |  | $ 23,000,000 |  |  |  |  |  |  |  |  |  |
Proceeds from termination of CSA | $ 23,000,000 |  |  |  |  |  |  |  |  |  |  |
Gain on credit support agreement |  |  |  |  |  |  |  |  | $ 9,400,000 |  |  |
Original Advisory Agreement | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Base management fee, percent |  |  |  |  |  | 1.375% |  |  |  |  |  |
Incentive fee, percent |  |  | 2.00% |  |  |  |  |  |  |  |  |
Amended and Restated Advisory Agreement | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Base management fee, percent |  |  |  | 1.25% |  |  |  |  |  |  |  |
New Barings BDC Advisory Agreement | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incentive fee, percent |  |  | 2.0625% |  |  |  |  |  |  |  |  |
Original Advisory Agreement - Annualized Incentive Fee Rate | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Base management fee, percent |  |  | 8.00% |  |  |  |  |  |  |  |  |
New Barings BDC Advisory Agreement - Annualized Incentive Fee Rate | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Base management fee, percent |  |  | 8.25% |  |  |  |  |  |  |  |  |
Investment Advisory Agreement | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Base management fee, percent |  |  |  |  |  |  |  |  | 1.25% |  |  |
Investment Management Agreement | Related Party |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of components | component |  |  |  |  |  |  | 2 |  | 2 |  |  |
Investment Management Agreement - Incentive Rate, Quarterly Hurdle Rate | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incentive fee, percent |  |  |  | 2.0625% |  |  |  |  |  |  |  |
Investment Management Agreement - Incentive Rate, Annualized Hurdle Rate | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incentive fee, percent |  |  |  | 8.25% |  |  |  |  |  |  |  |
Investment Management Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income Below Catch-Up Threshold | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incentive fee, percent |  |  |  | 100.00% |  |  |  |  |  |  |  |
Investment Management Agreement - Incentive Rate, Quarterly Catch-Up Threshold | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incentive fee, percent |  |  |  | 2.57812% |  |  |  |  |  |  |  |
Investment Management Agreement - Incentive Rate, Annual Catch-Up Threshold | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incentive fee, percent |  |  |  | 10.3125% |  |  |  |  |  |  |  |
Investment Management Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income Exceeds Catch-Up Threshold | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incentive fee, percent |  |  |  | 20.00% |  |  |  |  |  |  |  |
Pre-Incentive Fee Net Investment Income For Trailing Twelve Quarters Exceeds Catch-Up Amount | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incentive fee, percent |  |  |  | 20.00% |  |  |  |  |  |  |  |
Investment Management Agreement - Incentive Rate, Cumulative Pre-Incentive Fee Net Return | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incentive fee, percent |  |  |  | 20.00% |  |  |  |  |  |  |  |
Investment Management Agreement - Incentive Rate, Realized Capital Gains | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incentive fee, percent |  |  |  |  |  |  |  |  |  |  | 20.00% |
Investment Management Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incentive management fees |  |  |  |  |  |  | $ 5,600,000 | 6,600,000 | $ 24,500,000 | 15,900,000 |  |
Investment Management Agreement - Incentive Rate, Capital Gain Fee |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Incentive management fees |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 |  |
MVC Credit Support Agreement | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Related party transaction amount (up to) |  |  |  |  | $ 23,000,000 |  |  |  |  |  |  |
Related party transaction, term |  |  |  |  | 10 years |  |  |  |  |  |  |
MVC Credit Support Agreement - Covered Credit Losses Minimum | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Related party transaction amount (up to) |  |  |  |  | $ 0.00 |  |  |  |  |  |  |
Sierra Credit Support Agreement | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Related party transaction amount (up to) |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |
Related party transaction, term |  |  | 10 years |  |  |  |  |  |  |  |  |
Sierra Credit Support Agreement Covered Credit Losses Minimum | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Related party transaction amount (up to) |  |  | $ 0.00 |  |  |  |  |  |  |  |  |

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