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Management Fees, Incentive Fees and Other Expenses - Additional Information (Details) |  | 3 Months Ended | 9 Months Ended | 74 Months Ended |  |  |  |
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Feb. 24, 2025 | Sep. 30, 2025 USD ($) $ / shares | Sep. 30, 2025 USD ($) $ / shares | Mar. 31, 2025 | Dec. 31, 2024 USD ($) | Mar. 18, 2024 $ / shares | Mar. 17, 2024 | Feb. 08, 2019 $ / shares
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |  |  |  |  |  |
Percentage of management fee on assets |  |  |  | 200.00% |  |  |  |
Percentage of management fee on net asset value |  |  |  | 1.50% |  |  |  |
Base management fee rate |  |  |  |  |  |  |  | 1.5
Percentage of net asset value |  |  |  |  |  |  |  | 200.00%
Mangement fee waving description | On February 24, 2025, the Advisor voluntarily agreed to waive one third of its management fee for each of the first three quarters of 2025, starting on January 1, 2025 and ending on September 30, 2025. |  |  |  |  |  |  |
Advisor waived | $ |  | $ (1,800,000) | $ (5,500,000) |  |  |  |  |
Price per share | $ / shares |  | $ 6.2 | $ 6.2 |  |  |  |  |
Cumulative total return |  |  | 7.00% |  |  |  |  |
Accrued reserve for additional incentive compensation | $ |  | $ 0 | $ 0 |  | $ 0 |  |  |
Maximum |  |  |  |  |  |  |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |  |  |  |  |  |
Percentage of management fee on net asset value |  |  |  | 1.50% |  |  |  |
Percentage of reduction of incentive compensation on net investment income and net unrealized losses |  |  |  | 20.00% |  |  |  |
Percentage of reduction of cumulative return hurdle |  |  |  | 8.00% |  |  |  |
Percentage rate of net realized gains on income fee reduction |  |  |  |  |  |  |  | 20.00%
Minimum |  |  |  |  |  |  |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |  |  |  |  |  |
Percentage of management fee on net asset value |  |  |  | 1.00% |  |  |  |
Percentage of reduction of incentive compensation on net investment income and net unrealized losses |  |  |  | 17.50% |  |  |  |
Percentage of reduction of cumulative return hurdle |  |  |  | 7.00% |  |  |  |
Percentage rate of net realized gains on income fee reduction |  |  |  |  |  |  |  | 17.50%
BlackRock Capital Investment Corporation |  |  |  |  |  |  |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |  |  |  |  |  |
Base management fee rate |  |  |  |  |  | 0.01 | 0.015 | 1
Percentage of net asset value |  |  |  |  |  | 200.00% | 200.00% |
BlackRock Capital Investment Corporation | Maximum |  |  |  |  |  |  |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |  |  |  |  |  |
Base management fee rate |  |  |  |  |  | 0.015 |  | 1.5
Price per share | $ / shares |  |  |  |  |  | $ 0.32 |  | $ 0.32
BlackRock Capital Investment Corporation | Minimum |  |  |  |  |  |  |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |  |  |  |  |  |
Base management fee rate |  |  |  |  |  | 0.0125 |  | 1.25
Percentage of net asset value |  |  |  |  |  | 200.00% |  | 200.00%

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