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INVESTMENTS - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details)	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 2,521,635,000	$ 2,448,935,000	[1]
Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	1,700,689,000	1,696,192,000
Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	257,633,000	263,139,000
Structured products
Schedule of Equity Method Investments [Line Items]
Fair Value	89,731,000	73,550,000
Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	355,690,000	284,570,000
Equity warrants
Schedule of Equity Method Investments [Line Items]
Fair Value	1,246,000	1,057,000
Fair Value, Inputs, Level 3 | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	1,602,327,000	1,591,356,000
Fair Value, Inputs, Level 3 | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	243,597,000	234,214,000
Fair Value, Inputs, Level 3 | Structured products
Schedule of Equity Method Investments [Line Items]
Fair Value	35,600,000	17,827,000
Fair Value, Inputs, Level 3 | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	355,621,000	283,067,000
Fair Value, Inputs, Level 3 | Equity warrants
Schedule of Equity Method Investments [Line Items]
Fair Value	1,246,000	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	1,397,313,000
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	172,950,000
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Structured products
Schedule of Equity Method Investments [Line Items]
Fair Value	23,519,000
Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	8,518,000
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	13,132,000	$ 14,794,000
Input		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	21,563,000	$ 35,536,000
Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Fair Value	330,192,000	259,219,000
Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants
Schedule of Equity Method Investments [Line Items]
Fair Value	1,243,000
Fair Value, Inputs, Level 3 | Market Approach | Revenue Multiple | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	$ 1,127,000	$ 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	$ 1,452,000	$ 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	$ 3,026,000
Input	(44,742,400)	(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	$ 167,325,000
Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Subordinated debt and 2nd lien notes
Schedule of Equity Method Investments [Line Items]
Fair Value	3,176,000
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	3,326,000
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	1,402,000
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	$ 23,430,000	$ 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	45,908,000	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	12,081,000	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	$ 7,705,000	$ 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	0.073	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	0.090	0.084
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Structured products
Schedule of Equity Method Investments [Line Items]
Input	0.088
Minimum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	0.142	0.157
Minimum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Senior debt and 1st lien notes
Schedule of Equity Method Investments [Line Items]
Input	5.0
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	5.0	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	0.961	0.967
Minimum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	1.00	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	0.414	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	0.189	0.166
Maximum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Structured products
Schedule of Equity Method Investments [Line Items]
Input	0.110
Maximum | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	0.155	0.178
Maximum | 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
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	12.50	9.0
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	35.0	43.0
Maximum | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants
Schedule of Equity Method Investments [Line Items]
Input	14.0	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	1.000	1.000
Maximum | Fair Value, Inputs, Level 3 | Recent Transaction | Transaction Price | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	1,000	1,015.13
Maximum | Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	1,400	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	0.122	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	0.136	0.131
Weighted Average | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Structured products
Schedule of Equity Method Investments [Line Items]
Input	0.095
Weighted Average | Fair Value, Inputs, Level 3 | Yield Analysis | Market Yield | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	0.149	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	5.1	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	9.3	7.4
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	10.6	9.4
Weighted Average | Fair Value, Inputs, Level 3 | Market Approach | Adjusted EBITDA Multiple | Equity warrants
Schedule of Equity Method Investments [Line Items]
Input	7.9	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	6.7	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	(44,742,400)	(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	0.976	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	1.000	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	171.5	521.22
Weighted Average | Fair Value, Inputs, Level 3 | Expected Recovery | Expected Recovery | Equity shares
Schedule of Equity Method Investments [Line Items]
Input	1,397,500	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 the February 2019 Credit Facility.

X

- 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

X

- Definition

Fair value of investment in security owned.

+ References

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