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N-2 - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 28, 2026 | Sep. 09, 2025 | Mar. 11, 2024 | Nov. 24, 2020 | Feb. 10, 2020 | Mar. 31, 2026 | Dec. 31, 2025 | Mar. 31, 2025 | Dec. 31, 2024
Cover [Abstract] |  |  |  |  |  |  |  |  |  |
Entity Central Index Key |  |  |  |  |  |  | 0001572694 |  |  |
Amendment Flag |  |  |  |  |  |  | false |  |  |
Securities Act File Number |  |  |  |  |  |  | 814-00998 |  |  |
Document Type |  |  |  |  |  |  | 10-Q |  |  |
Entity Registrant Name |  |  |  |  |  |  | Goldman Sachs BDC, Inc. |  |  |
Entity Address, Address Line One |  |  |  |  |  |  | 200 West Street |  |  |
Entity Address, City or Town |  |  |  |  |  |  | New York |  |  |
Entity Address, State or Province |  |  |  |  |  |  | NY |  |  |
Entity Address, Postal Zip Code |  |  |  |  |  |  | 10282 |  |  |
City Area Code |  |  |  |  |  |  | 312 |  |  |
Local Phone Number |  |  |  |  |  |  | 655 - 4419 |  |  |
Entity Emerging Growth Company |  |  |  |  |  |  | false |  |  |
General Description of Registrant [Abstract] |  |  |  |  |  |  |  |  |  |
Investment Objectives and Practices [Text Block] |  |  |  |  |  |  | The Company’s investment objective is to generate current income and, to a lesser extent, capital appreciation primarily through direct originations of secured debt, including first lien debt, unitranche debt, including last-out portions of such loans, and second lien debt, and unsecured debt, including mezzanine debt, as well as through select equity investments. |  |  |
Risk Factors [Table Text Block] |  |  |  |  |  |  | ITEM 1A. RISK FACTORS. An investment in our securities involves a high degree of risk. There have been no material changes to the risk factors previously reported under Item 1A. “Risk Factors” of our annual report on Form 10-K for the year ended December 31, 2025, which was filed with the SEC on February 26, 2026. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial may materially affect our business, financial condition and/or operating results. |  |  |
NAV Per Share | [1],[2] |  |  |  |  |  | $ 12.17 | $ 12.64 | $ 13.2 | $ 13.41
Capital Stock, Long-Term Debt, and Other Securities [Abstract] |  |  |  |  |  |  |  |  |  |
Long Term Debt, Title [Text Block] |  |  |  |  |  |  | Revolving Credit Facility |  |  |
2025 Notes |  |  |  |  |  |  |  |  |  |
Capital Stock, Long-Term Debt, and Other Securities [Abstract] |  |  |  |  |  |  |  |  |  |
Long Term Debt, Title [Text Block] |  |  |  |  |  |  | 2025 Notes |  |  |
Long Term Debt, Principal |  |  |  |  |  | $ 360,000 |  |  |  |
Long Term Debt, Structuring [Text Block] |  |  |  |  |  |  | On February 10, 2020, we closed an offering of $360.00 million aggregate principal amount of 3.750% unsecured notes due 2025 (the “2025 Notes”). The 2025 Notes were issued pursuant to an indenture between us and Computershare Trust Company, National Association, as Trustee (as successor to Wells Fargo Bank, National Association (“Wells Fargo”)). The 2025 Notes bore interest at a rate of 3.750% per year, payable semi-annually in arrears on February 10 and August 10 of each year. The 2025 Notes matured and were fully repaid on February 10, 2025 in accordance with their terms, using proceeds from the Revolving Credit Facility. For further details, see Note 6 “Debt—2025 Notes” to our consolidated financial statements included in this report. |  |  |
2026 Notes |  |  |  |  |  |  |  |  |  |
Capital Stock, Long-Term Debt, and Other Securities [Abstract] |  |  |  |  |  |  |  |  |  |
Long Term Debt, Title [Text Block] |  |  |  |  |  |  | 2026 Notes |  |  |
Long Term Debt, Principal |  |  |  |  | $ 500,000 |  |  |  |  |
Long Term Debt, Structuring [Text Block] |  |  |  |  |  |  | 2026 Notes On November 24, 2020, we closed an offering of $500.00 million aggregate principal amount of 2.875% unsecured notes due 2026 (the “2026 Notes”). The 2026 Notes were issued pursuant to an indenture between us and Computershare Trust Company, National Association, as Trustee (as successor to Wells Fargo). The 2026 Notes bore interest at a rate of 2.875% per year, payable semi-annually in arrears on January 15 and July 15 of each year. The 2026 Notes matured and were fully repaid on January 15, 2026 in accordance with their terms, using proceeds from the Revolving Credit Facility. For further details, see Note 6 “Debt—2026 Notes” to our consolidated financial statements included in this report. |  |  |
2027 Notes |  |  |  |  |  |  |  |  |  |
Capital Stock, Long-Term Debt, and Other Securities [Abstract] |  |  |  |  |  |  |  |  |  |
Long Term Debt, Title [Text Block] |  |  |  |  |  |  | 2027 Notes |  |  |
Long Term Debt, Principal |  |  |  | $ 400,000 |  |  |  |  |  |
Long Term Debt, Structuring [Text Block] |  |  |  |  |  |  | On March 11, 2024, we closed an offering of $400.00 million aggregate principal amount of 6.375% unsecured notes due 2027 (the “2027 Notes”). The 2027 Notes were issued pursuant to an indenture between us and Computershare Trust Company, National Association, as Trustee (as successor to Wells Fargo). The 2027 Notes bear interest at a rate of 6.375% per year, payable semi-annually in arrears on March 11 and September 11 of each year. The 2027 Notes will mature on March 11, 2027 and may be redeemed in whole or in part at our option at any time or from time to time at the redemption prices set forth in the indenture. In connection with the 2027 Notes, we entered into an interest rate swap to more closely align the interest rates of our fixed rate liabilities with the investment portfolio, which predominately consists of floating rate loans. We designated this interest rate swap and the 2027 Notes in a qualifying fair value hedging relationship. For further details, see Note 2 “Significant Accounting Policies—Derivatives”, Note 6 “Debt—2027 Notes” and Note 7 "Derivatives" to our consolidated financial statements included in this report. |  |  |
2029 Notes |  |  |  |  |  |  |  |  |  |
Capital Stock, Long-Term Debt, and Other Securities [Abstract] |  |  |  |  |  |  |  |  |  |
Long Term Debt, Title [Text Block] |  |  |  |  |  |  | 2029 Notes |  |  |
Long Term Debt, Principal |  | $ 400,000 |  |  |  |  |  |  |  |
Long Term Debt, Structuring [Text Block] |  |  |  |  |  |  | 2029 Notes On January 28, 2026, we closed an offering of $400.00 million aggregate principal amount of 5.100% unsecured notes due 2029 (the “2029 Notes”). The 2029 Notes were issued pursuant to an indenture between us and Computershare Trust Company, National Association, as Trustee (as successor to Wells Fargo). The 2029 Notes bear interest at a rate of 5.100% per year, payable semi-annually in arrears on January 28 and July 28 of each year, commencing on July 28, 2026. The 2029 Notes will mature on January 28, 2029 and may be redeemed in whole or in part at our option at any time or from time to time at the redemption prices set forth in the indenture. In connection with the 2029 Notes, we entered into an interest rate swap to more closely align the interest rates of our fixed rate liabilities with the investment portfolio, which predominately consists of floating rate loans. We designated this interest rate swap and the 2029 Notes in a qualifying fair value hedging relationship. For further details, see Note 2 “Significant Accounting Policies—Derivatives”, Note 6 “Debt—2029 Notes” and Note 7 "Derivatives" to our consolidated financial statements included in this report. |  |  |
2030 Notes |  |  |  |  |  |  |  |  |  |
Capital Stock, Long-Term Debt, and Other Securities [Abstract] |  |  |  |  |  |  |  |  |  |
Long Term Debt, Title [Text Block] |  |  |  |  |  |  | 2030 Notes |  |  |
Long Term Debt, Principal |  |  | $ 400,000 |  |  |  |  |  |  |
Long Term Debt, Structuring [Text Block] |  |  |  |  |  |  | On September 9, 2025, we closed an offering of $400.00 million aggregate principal amount of 5.650% unsecured notes due 2030 (the “2030 Notes”). The 2030 Notes were issued pursuant to an indenture between us and Computershare Trust Company, National Association, as Trustee (as successor to Wells Fargo). The 2030 Notes bear interest at a rate of 5.650% per year, payable semi-annually in arrears on March 9 and September 9 of each year. The 2030 Notes will mature on September 9, 2030 and may be redeemed in whole or in part at our option at any time or from time to time at the redemption prices set forth in the indenture. In connection with the 2030 Notes, we entered into an interest rate swap to more closely align the interest rates of our fixed rate liabilities with the investment portfolio, which predominately consists of floating rate loans. We designated this interest rate swap and the 2030 Notes in a qualifying fair value hedging relationship. For further details, see Note 2 “Significant Accounting Policies—Derivatives”, Note 6 “Debt—2030 Notes” and Note 7 "Derivatives" to our consolidated financial statements included in this report. |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Capital Stock, Long-Term Debt, and Other Securities [Abstract] |  |  |  |  |  |  |  |  |  |
Long Term Debt, Title [Text Block] |  |  |  |  |  |  | On September 19, 2013, we entered into the Revolving Credit Facility with various lenders. Truist Bank serves as administrative agent and Bank of America, N.A. serves as syndication agent under the Revolving Credit Facility. The aggregate committed borrowing amount under the Revolving Credit Facility is $1,695.00 million. The Revolving Credit Facility includes an uncommitted accordion feature that allows us, under certain circumstances, to increase the borrowing capacity of the Revolving Credit Facility to up to $2,542.50 million. We amended and restated the Revolving Credit Facility on numerous occasions between October 3, 2014 and January 14, 2026. Borrowings denominated in USD, including amounts drawn in respect of letters of credit, bear interest (at our election) of either (i) Term SOFR plus a margin of either (x) 2.00%, (y) 1.875% (subject to maintenance of certain long-term corporate debt ratings) or (z) 1.75% (subject to certain gross borrowing base conditions), in each case, plus an additional 0.10% credit adjustment spread, or (ii) an alternative base rate, which is the highest of (i) the Prime Rate in effect on such day, (ii) the Federal Funds Effective Rate for such day plus 1/2 of 1.00% and (iii) the rate per annum equal to (x) the greater of (A) Term SOFR for an interest period of one (1) month and (B) zero plus (y) 1.00%, plus a margin of either (x) 1.00%, (y) 0.875% (subject to maintenance of certain long-term corporate debt ratings) or (z) 0.75% (subject to certain gross borrowing base conditions). Borrowings denominated in non-USD bear interest of the applicable term benchmark rate or the applicable risk-free rate (“RFR rate”) plus a margin of either 2.00%, 1.875% or 1.75% (subject to the conditions applicable to borrowings denominated in USD that bear interest based on the applicable term benchmark rate or the applicable RFR rate), plus, (i) in the case of borrowings denominated in GBP only, an additional 0.1193% credit adjustment spread, (ii) in the case of borrowings denominated in CHF only, an additional 0.0031% and (iii) in the case of borrowings denominated in CAD only, an additional 0.29547% (one-month interest period) or an additional 0.32138% (three-month interest period) credit adjustment spread. Borrowings from certain lenders, which hold approximately 84% of total lending commitments (the "Extending Lenders"), bear interest at the applicable rates described above less 0.10%. With respect to borrowings denominated in USD, we may elect either Term SOFR, or an alternative base rate at the time of borrowing, and such borrowings may be converted from one benchmark to another at any time, subject to certain conditions. Interest is payable in arrears on the applicable interest payment date as specified therein. We pay a fee of 0.375% per annum on committed but undrawn amounts under the Revolving Credit Facility, payable quarterly in arrears. Any amounts borrowed under the Revolving Credit Facility with respect to the Extending Lenders, will mature, and all accrued and unpaid interest will be due and payable, on June 24, 2030. Any amounts borrowed under the Revolving Credit Facility will mature, and all accrued and unpaid interest will be due and payable, with respect to certain remaining lenders, on May 5, 2027, and with respect to other remaining lenders, on October 18, 2028. |  |  |
Long Term Debt, Structuring [Text Block] |  |  |  |  |  |  | Borrowings denominated in USD, including amounts drawn in respect of letters of credit, bear interest (at our election) of either (i) Term SOFR plus a margin of either (x) 2.00%, (y) 1.875% (subject to maintenance of certain long-term corporate debt ratings) or (z) 1.75% (subject to certain gross borrowing base conditions), in each case, plus an additional 0.10% credit adjustment spread, or (ii) an alternative base rate, which is the highest of (i) the Prime Rate in effect on such day, (ii) the Federal Funds Effective Rate for such day plus 1/2 of 1.00% and (iii) the rate per annum equal to (x) the greater of (A) Term SOFR for an interest period of one (1) month and (B) zero plus (y) 1.00%, plus a margin of either (x) 1.00%, (y) 0.875% (subject to maintenance of certain long-term corporate debt ratings) or (z) 0.75% (subject to certain gross borrowing base conditions). Borrowings denominated in non-USD bear interest of the applicable term benchmark rate or the applicable risk-free rate (“RFR rate”) plus a margin of either 2.00%, 1.875% or 1.75% (subject to the conditions applicable to borrowings denominated in USD that bear interest based on the applicable term benchmark rate or the applicable RFR rate), plus, (i) in the case of borrowings denominated in GBP only, an additional 0.1193% credit adjustment spread, (ii) in the case of borrowings denominated in CHF only, an additional 0.0031% and (iii) in the case of borrowings denominated in CAD only, an additional 0.29547% (one-month interest period) or an additional 0.32138% (three-month interest period) credit adjustment spread. Borrowings from certain lenders, which hold approximately 84% of total lending commitments (the "Extending Lenders"), bear interest at the applicable rates described above less 0.10%. With respect to borrowings denominated in USD, we may elect either Term SOFR, or an alternative base rate at the time of borrowing, and such borrowings may be converted from one benchmark to another at any time, subject to certain conditions. Interest is payable in arrears on the applicable interest payment date as specified therein. We pay a fee of 0.375% per annum on committed but undrawn amounts under the Revolving Credit Facility, payable quarterly in arrears. Any amounts borrowed under the Revolving Credit Facility with respect to the Extending Lenders, will mature, and all accrued and unpaid interest will be due and payable, on June 24, 2030. Any amounts borrowed under the Revolving Credit Facility will mature, and all accrued and unpaid interest will be due and payable, with respect to certain remaining lenders, on May 5, 2027, and with respect to other remaining lenders, on October 18, 2028. |  |  |
[1] | Amount rounds to less than $0.01
[2] | The per share data was derived by using the weighted average shares outstanding during the applicable period that the shares were outstanding, except for distributions recorded, which reflects the actual amount per share for the applicable period.

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