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INVESTMENTS - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details) | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | $ 2,505,992,000 | [1] | $ 2,448,935,000 | [2]
Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | 1,700,975,000 |  | 1,696,192,000 |
Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | 246,997,000 |  | 263,139,000 |
Structured products |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | 81,068,000 |  | 73,550,000 |
Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | 356,201,000 |  | 284,570,000 |
Equity warrants |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | 1,144,000 |  | 1,057,000 |
Fair Value, Inputs, Level 3 | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | 1,596,129,000 |  | 1,591,356,000 |
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | 209,090,000 |  | 234,214,000 |
Fair Value, Inputs, Level 3 | Structured products |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | 30,895,000 |  | 17,827,000 |
Fair Value, Inputs, Level 3 | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | 355,175,000 |  | 283,067,000 |
Fair Value, Inputs, Level 3 | Equity warrants |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | 1,144,000 |  | 1,057,000 |
Fair Value, Inputs, Level 3 | Yield Analysis | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value |  |  | 1,305,819,000 |
Fair Value, Inputs, Level 3 | Yield Analysis | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value |  |  | 182,856,000 |
Fair Value, Inputs, Level 3 | Yield Analysis | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value |  |  | 12,600,000 |
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | 1,499,714,000 |  |  |
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | 165,875,000 |  |  |
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Structured products |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | 18,797,000 |  |  |
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | 8,220,000 |  |  |
Fair Value, Inputs, Level 3 | Market Approach | Equity warrants |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value |  |  | 1,054,000 |
Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | $ 15,133,000 |  | $ 14,794,000 |
Input | 5.8 |  | 6.0 |
Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | $ 36,829,000 |  | $ 35,536,000 |
Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | 337,091,000 |  | 259,219,000 |
Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | 1,141,000 |  |  |
Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | $ 1,141,000 |  | $ 1,263,000 |
Input | 0.2 |  | 0.2 |
Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value |  |  | $ 2,186,000 |
Input |  |  | 0.5 |
Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | $ 1,425,000 |  | $ 1,321,000 |
Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA/Revenue Multiple Blend | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value |  |  | $ 221,000 |
Input |  |  | 5.8 |
Fair Value, Inputs, Level 3 | Discounted Cash Flow Analysis | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value |  |  | $ 13,153,000 |
Fair Value, Inputs, Level 3 | Discounted Cash Flow Analysis | Structured products |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value |  |  | $ 3,792,000 |
Fair Value, Inputs, Level 3 | Discounted Cash Flow Analysis | Discount Rate | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input |  |  | 13 |
Fair Value, Inputs, Level 3 | Discounted Cash Flow Analysis | Discount Rate | Structured products |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input |  |  | 0.104 |
Fair Value, Inputs, Level 3 | Net Asset Approach | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value |  |  | $ 1,932,000 |
Fair Value, Inputs, Level 3 | Net Asset Approach | Liabilities | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | $ 2,938,000 |  |  |
Input | (33,951,400) |  | (8,941,800) |
Fair Value, Inputs, Level 3 | Recent Transaction | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value |  |  | $ 233,824,000 |
Fair Value, Inputs, Level 3 | Recent Transaction | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value |  |  | 513,000 |
Fair Value, Inputs, Level 3 | Recent Transaction | Structured products |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value |  |  | 5,239,000 |
Fair Value, Inputs, Level 3 | Recent Transaction | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value |  |  | $ 4,921,000 |
Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | $ 47,748,000 |  |  |
Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | 1,504,000 |  |  |
Input |  |  | 0.973 |
Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Structured products |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input |  |  | 1.000 |
Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | 2,111,000 |  |  |
Fair Value, Inputs, Level 3 | Expected Recovery | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value |  |  | $ 112,000 |
Fair Value, Inputs, Level 3 | Expected Recovery | Equity warrants |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value |  |  | $ 3,000 |
Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | 112,000 |  |  |
Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity warrants |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | $ 3,000 |  |  |
Input | 3.0 |  | 3.0 |
Fair Value, Inputs, Level 3 | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | $ 32,393,000 |  | $ 22,503,000 |
Fair Value, Inputs, Level 3 | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | 4,882,000 |  | 13,123,000 |
Fair Value, Inputs, Level 3 | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Structured products |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | 12,098,000 |  | 8,796,000 |
Fair Value, Inputs, Level 3 | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Fair Value | $ 3,278,000 |  | $ 2,741,000 |
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.075 |  | 0.077 |
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.086 |  | 0.084 |
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Structured products |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.082 |  |  |
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.136 |  | 0.157 |
Minimum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 7.0 |  | 6.5 |
Minimum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 1.8 |  | 4.0 |
Minimum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 5.3 |  | 4.0 |
Minimum | Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.2 |  | 0.2 |
Minimum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.933 |  | 0.967 |
Minimum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.970 |  |  |
Minimum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.98 |  | 0.00 |
Minimum | Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 2.5 |  | 2.5 |
Maximum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.306 |  | 0.373 |
Maximum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.181 |  | 0.166 |
Maximum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Structured products |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.116 |  |  |
Maximum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.148 |  | 0.178 |
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 11.0 |  | 9.0 |
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 40.0 |  | 43.0 |
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 14.5 |  | 17.5 |
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 9.5 |  | 7.0 |
Maximum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.975 |  | 1.000 |
Maximum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.980 |  |  |
Maximum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 14.94 |  | 1,015.13 |
Maximum | Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 110.0 |  | 110 |
Weighted Average | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.119 |  | 0.117 |
Weighted Average | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.135 |  | 0.131 |
Weighted Average | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Structured products |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.092 |  |  |
Weighted Average | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.142 |  | 0.167 |
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 5.8 |  | 6.0 |
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 8.2 |  | 7.4 |
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 10.7 |  | 9.4 |
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 8.4 |  | 7.3 |
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.2 |  | 0.2 |
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input |  |  | 0.5 |
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 6.6 |  | 6.8 |
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA/Revenue Multiple Blend | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input |  |  | 5.8 |
Weighted Average | Fair Value, Inputs, Level 3 | Discounted Cash Flow Analysis | Discount Rate | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input |  |  | 0.130 |
Weighted Average | Fair Value, Inputs, Level 3 | Discounted Cash Flow Analysis | Discount Rate | Structured products |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input |  |  | 0.104 |
Weighted Average | Fair Value, Inputs, Level 3 | Net Asset Approach | Liabilities | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | (33,951,400) |  | (8,941,800) |
Weighted Average | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Senior debt and 1st lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.960 |  | 0.975 |
Weighted Average | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Subordinated debt and 2nd lien notes |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 0.976 |  | 0.973 |
Weighted Average | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Structured products |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input |  |  | 1.000 |
Weighted Average | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 11.8 |  | 521.22 |
Weighted Average | Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity shares |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 107,600 |  | 107.6 |
Weighted Average | Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity warrants |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Input | 3.0 |  | 3.0 |
[1] | All of the investment is or will be encumbered as security for the Company’s $1.1 billion senior secured credit facility with ING Capital LLC initially entered into in February 2019 (as amended, restated and otherwise modified from time to time, the “February 2019 Credit Facility”).
[2] | All of the investment is or will be encumbered as security for the Company's $1.1 billion senior secured credit facility with ING Capital LLC initially entered into in the February 2019 Credit Facility.

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- Definition Investment Owned, Fair Value, Measurement Input + References No definition available. + Details
Name: | bbdc_InvestmentOwnedFairValueMeasurementInput
Namespace Prefix: | bbdc_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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