N-2 - USD ($) $ / shares in Units, $ in Millions |
6 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Mar. 31, 2024 |
Dec. 31, 2023 |
Sep. 30, 2023 |
Mar. 31, 2023 |
Dec. 31, 2022 |
Sep. 30, 2022 |
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| Cover [Abstract] | ||||||||||
| Entity Central Index Key | 0001414932 | |||||||||
| Amendment Flag | false | |||||||||
| Securities Act File Number | 1-33901 | |||||||||
| Document Type | 10-Q | |||||||||
| Entity Registrant Name | Oaktree Specialty Lending Corporation | |||||||||
| Entity Address, Address Line One | 333 South Grand Avenue | |||||||||
| Entity Address, Address Line Two | 28th Floor | |||||||||
| Entity Address, City or Town | Los Angeles | |||||||||
| Entity Address, State or Province | CA | |||||||||
| Entity Address, Postal Zip Code | 90071 | |||||||||
| City Area Code | 213 | |||||||||
| Local Phone Number | 830-6300 | |||||||||
| Entity Emerging Growth Company | false | |||||||||
| Financial Highlights [Abstract] | ||||||||||
| Senior Securities Amount | $ 1,680.7 | $ 1,767.6 | ||||||||
| General Description of Registrant [Abstract] | ||||||||||
| Investment Objectives and Practices [Text Block] | Our investment objective is to generate current income and capital appreciation by providing companies with flexible and innovative financing solutions, including first and second lien loans, unsecured and mezzanine loans, bonds, preferred equity and certain equity co-investments. We may also seek to generate capital appreciation and income through secondary investments at discounts to par in either private or syndicated transactions. Our portfolio may also include certain structured finance and other non-traditional structures. We invest in companies that typically possess resilient business models with strong underlying fundamentals. We intend to deploy capital across credit and economic cycles with a focus on long-term results, which we believe will enable us to build lasting partnerships with financial sponsors and management teams, and we may seek to opportunistically take advantage of dislocations in the financial markets and other situations that may benefit from Oaktree’s credit and structuring expertise. Sponsors may include financial sponsors, such as an institutional investor or a private equity firm, or a strategic entity seeking to invest in a portfolio company. We generally invest in securities that are rated below investment grade by rating agencies or that would be rated below investment grade if they were rated. Below investment grade securities, which are often referred to as “high yield” and “junk,” have predominantly speculative characteristics with respect to the issuer’s capacity to pay interest and repay principal. In the current market environment, Oaktree intends to focus on the following areas, in which Oaktree believes there is less competition and thus potential for greater returns, for our new investment opportunities: (1) situational lending, which we define to include directly originated loans to non-sponsor companies that are hard to understand and value using traditional underwriting techniques, (2) select sponsor lending, which we define to include financing to support leveraged buyouts of companies with specialized sponsors that have expertise in certain industries, (3) stressed sector and rescue lending, which we define to include opportunistic private loans in industries experiencing stress or limited access to capital and (4) public credit, where we seek discounted, high quality public debt investments particularly in times of market dislocation.
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| NAV Per Share | $ 18.72 | [1] | $ 19.14 | $ 19.63 | $ 19.66 | [1] | $ 19.63 | $ 20.38 | ||
| Capital Stock, Long-Term Debt, and Other Securities [Abstract] | ||||||||||
| Long Term Debt [Table Text Block] | Syndicated Facility On November 30, 2017, the Company entered into a senior secured revolving credit facility (as amended and restated, the “Syndicated Facility”) pursuant to a Senior Secured Revolving Credit Agreement with the lenders party thereto, ING Capital LLC, as administrative agent, ING Capital LLC, JPMorgan Chase Bank, N.A., BofA Securities, Inc. and MUFG Union Bank, N.A., as joint lead arrangers and joint bookrunners, and JPMorgan Chase Bank, N.A. and Bank of America, N.A., as syndication agents. The Syndicated Facility provides that the Company may use the proceeds of the loans and issuances of letters of credit under the Syndicated Facility for general corporate purposes, including acquiring and funding leveraged loans, mezzanine loans, high-yield securities, convertible securities, preferred stock, common stock and other investments. The Syndicated Facility further allows the Company to request letters of credit from ING Capital LLC, as the issuing bank. As of March 31, 2024, the size of the Syndicated Facility was $1.218 billion. In addition, pursuant to an "accordion" feature, the Company may increase the size of the facility to up to the greater of $1.25 billion and the Company's net worth, as defined in the facility, under certain circumstances. As of March 31, 2024, (i) the period during which the Company may make drawings with respect to $1.035 billion of commitments will expire on June 23, 2027 and the maturity date is June 23, 2028, (ii) the period during which the Company may make drawings with respect to the remaining commitments will expire on May 4, 2025 and the maturity date is May 4, 2026 and (iii) the interest rate margin for (a) SOFR loans (which may be 1- or 3-month, at the Company’s option) was 2.00% plus a SOFR adjustment which ranges between 0.11448% and 0.26161% and (b) alternate base rate loans was 1.00%. The Syndicated Facility is secured by substantially all of the Company’s assets (excluding, among other things, investments held in and by certain subsidiaries of the Company (including OSI 2 Senior Lending SPV, LLC, or “OSI 2 SPV”) or investments in certain portfolio companies of the Company) and guaranteed by certain subsidiaries of the Company. The Syndicated Facility requires the Company to, among other things, (i) make representations and warranties regarding the collateral as well as each of the Company’s portfolio companies’ businesses, (ii) agree to certain indemnification obligations, and (iii) comply with various affirmative and negative covenants, reporting requirements and other customary requirements for similar revolving credit facilities, including covenants related to: (A) limitations on the incurrence of additional indebtedness and liens, (B) limitations on certain investments, (C) limitations on certain asset transfers and restricted payments, (D) maintaining a certain minimum stockholders’ equity, (E) maintaining a ratio of total assets (less total liabilities) to total indebtedness, of the Company and its subsidiaries (subject to certain exceptions), of not less than 1.50 to 1.00, (F) maintaining a ratio of consolidated EBITDA to consolidated interest expense, of the Company and its subsidiaries (subject to certain exceptions), of not less than 2.25 to 1.00, (G) maintaining a minimum liquidity and net worth, and (H) limitations on the creation or existence of agreements that prohibit liens on certain properties of the Company and certain of its subsidiaries. The Syndicated Facility also includes usual and customary default provisions such as the failure to make timely payments under the facility, the occurrence of a change in control, and the failure by the Company to materially perform under the agreements governing the facility, which, if not complied with, could accelerate repayment under the facility. As of March 31, 2024, the Company was in compliance with all financial covenants under the Syndicated Facility. In addition to the asset coverage ratio described above, borrowings under the Syndicated Facility (and the incurrence of certain other permitted debt) are subject to compliance with a borrowing base that will apply different advance rates to different types of assets in the Company’s portfolio. Each loan or letter of credit originated or assumed under the Syndicated Facility is subject to the satisfaction of certain conditions. As of March 31, 2024 and September 30, 2023, the Company had $450.0 million and $430.0 million of borrowings outstanding under the Syndicated Facility, which had a fair value of $450.0 million and $430.0 million, respectively. The Company's borrowings under the Syndicated Facility bore interest at a weighted average interest rate of 7.579% and 6.255% for the six months ended March 31, 2024 and 2023, respectively. For the three and six months ended March 31, 2024, the Company recorded interest expense (inclusive of fees) of $9.6 million and $19.1 million, respectively, related to the Syndicated Facility. For the three and six months ended March 31, 2023, the Company recorded interest expense (inclusive of fees) of $13.1 million and $23.1 million, respectively, related to the Syndicated Facility. Citibank Facility On March 19, 2021, the Company became party to a revolving credit facility (as amended and/or restated from time to time, the “Citibank Facility”) with OCSL Senior Funding II LLC, the Company’s wholly-owned, special purpose financing subsidiary, as the borrower, the Company, as collateral manager and seller, each of the lenders from time to time party thereto, Citibank, N.A., as administrative agent, and Wells Fargo Bank, National Association, as collateral agent and custodian. On May 25, 2023, in connection with an amendment to the OSI2 Citibank Facility, the Citibank Facility was terminated. As of March 31, 2024 and September 30, 2023, the Company did not have any borrowings outstanding under the Citibank Facility. The Company's borrowings under the Citibank Facility bore interest at a weighted average interest rate of 6.678% for the six months ended March 31, 2023. For the three and six months ended March 31, 2023, the Company recorded interest expense (inclusive of fees) of $2.9 million and $5.6 million, respectively, related to the Citibank Facility. OSI2 Citibank Facility On January 23, 2023, as a result of the consummation of the OSI2 Merger, the Company became party to a revolving credit facility (as amended and/or restated from time to time, the “OSI2 Citibank Facility”) with OSI 2 SPV, the Company’s wholly-owned and consolidated subsidiary, as the borrower, the Company, as collateral manager, each of the lenders from time to time party thereto, Citibank, N.A., as administrative agent, and Deutsche Bank Trust Company Americas, as collateral agent. As of March 31, 2024, the Company was able to borrow up to $400 million under the OSI2 Citibank Facility (subject to borrowing base and other limitations). As of March 31, 2024, the OSI2 Citibank Facility had a reinvestment period through May 25, 2025, during which advances may be made, and matures on January 26, 2027. Following the reinvestment period, OSI 2 SPV will be required to make certain mandatory amortization payments. Borrowings under the OSI2 Citibank Facility bear interest payable quarterly at a rate per year equal to (a) in the case of a lender that is identified as a conduit lender, the lesser of (i) the applicable commercial paper rate for such conduit lender and (ii) SOFR plus 2.00% per annum on broadly syndicated loans and 2.75% on all other eligible loans and (b) for all other lenders, SOFR plus 2.00% per annum on broadly syndicated loans and 2.75% per annum on all other eligible loans, in all cases subject to a minimum overall rate of SOFR plus 2.50% per annum. After the reinvestment period, the applicable spread is 4.00% per year. There is also a non-usage fee of 0.50% per year on the unused portion of the OSI2 Citibank Facility, payable quarterly; provided that if the unused portion of the OSI2 Citibank Facility is greater than 30% of the commitments under the OSI2 Citibank Facility, the non-usage fee will be based on an unused portion of 30% of the commitments under the OSI2 Citibank Facility. The OSI2 Citibank Facility is secured by a first priority security interest in substantially all of OSI 2 SPV’s assets. As part of the OSI2 Citibank Facility, OSI 2 SPV is subject to certain limitations as to how borrowed funds may be used and the types of loans that are eligible to be acquired by OSI 2 SPV including restrictions on sector concentrations, loan size, tenor and minimum investment ratings (or estimated ratings). The OSI2 Citibank Facility also contains certain requirements relating to interest coverage, collateral quality and portfolio performance, certain violations of which could result in the acceleration of the amounts due under the OSI2 Citibank Facility. As of each of March 31, 2024 and September 30, 2023, the Company had $280.0 million outstanding under the OSI2 Citibank Facility, which had a fair value of $280.0 million. The Company’s borrowings under the OSI2 Citibank Facility bore interest at a weighted average interest rate of 8.079% and 7.172% for the six months ended March 31, 2024 and the period from January 23, 2023 to March 31, 2023, respectively. For the three and six months ended March 31, 2024, the Company recorded interest expense (inclusive of fees) of $6.0 million and $12.1 million, respectively, related to the OSI2 Citibank Facility. For the period from January 23, 2023 to March 31, 2023, the Company recorded interest expense (inclusive of fees) of $3.1 million related to the OSI2 Citibank Facility. 2025 Notes On February 25, 2020, the Company issued $300.0 million in aggregate principal amount of the 2025 Notes for net proceeds of $293.8 million after deducting OID of $2.5 million, underwriting commissions and discounts of $3.0 million and offering costs of $0.7 million. The OID on the 2025 Notes is amortized based on the effective interest method over the term of the 2025 Notes. The 2025 Notes were issued pursuant to an indenture, dated April 30, 2012, as supplemented by the fifth supplemental indenture, dated February 25, 2020 (collectively, the "2025 Notes Indenture"), between the Company and Deutsche Bank Trust Company Americas (the "Trustee"). The 2025 Notes are the Company's general unsecured obligations that rank senior in right of payment to all of the Company's existing and future indebtedness that is expressly subordinated in right of payment to the 2025 Notes. The 2025 Notes rank equally in right of payment with all of the Company's existing and future liabilities that are not so subordinated. The 2025 Notes effectively rank junior to any of the Company's secured indebtedness (including unsecured indebtedness that the Company later secures) to the extent of the value of the assets securing such indebtedness. The 2025 Notes rank structurally junior to all existing and future indebtedness (including trade payables) incurred by the Company's subsidiaries, financing vehicles or similar facilities. Interest on the 2025 Notes is paid semi-annually on February 25 and August 25 at a rate of 3.500% per annum. The 2025 Notes mature on February 25, 2025 and may be redeemed in whole or in part at any time or from time to time at the Company's option prior to maturity at par plus a “make-whole” premium, if applicable. In addition, holders of the 2025 Notes can require the Company to repurchase the 2025 Notes at 100% of their principal amount upon the occurrence of certain change of control events as described in the 2025 Notes Indenture. The 2025 Notes were issued in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof. During the three and six months ended March 31, 2024, the Company did not repurchase any of the 2025 Notes in the open market. The 2025 Notes Indenture contains certain covenants, including covenants requiring the Company's compliance with the asset coverage requirements set forth in Section 18(a)(1)(A) as modified by Section 61(a)(1) and (2) of the Investment Company Act or any successor provisions (but giving effect to any exemptive relief granted to the Company by the U.S. Securities and Exchange Commission ("SEC")), as well as covenants requiring the Company to provide financial information to the holders of the 2025 Notes and the Trustee if the Company ceases to be subject to the reporting requirements of the Securities Exchange Act of 1934, as amended (the "Exchange Act"). These covenants are subject to limitations and exceptions that are described in the 2025 Notes Indenture. 2027 Notes On May 18, 2021, the Company issued $350.0 million in aggregate principal amount of the 2027 Notes for net proceeds of $344.8 million after deducting OID of $1.0 million, underwriting commissions and discounts of $3.5 million and offering costs of $0.7 million. The OID on the 2027 Notes is amortized based on the effective interest method over the term of the 2027 Notes. The 2027 Notes were issued pursuant to an indenture, dated April 30, 2012, as supplemented by the sixth supplemental indenture, dated May 18, 2021 (collectively, the "2027 Notes Indenture"), between the Company and the Trustee. The 2027 Notes are the Company's general unsecured obligations that rank senior in right of payment to all of the Company's existing and future indebtedness that is expressly subordinated in right of payment to the 2027 Notes. The 2027 Notes rank equally in right of payment with all of the Company's existing and future liabilities that are not so subordinated. The 2027 Notes effectively rank junior to any of the Company's secured indebtedness (including unsecured indebtedness that the Company later secures) to the extent of the value of the assets securing such indebtedness. The 2027 Notes rank structurally junior to all existing and future indebtedness (including trade payables) incurred by the Company's subsidiaries, financing vehicles or similar facilities. Interest on the 2027 Notes is paid semi-annually on January 15 and July 15 at a rate of 2.700% per annum. The 2027 Notes mature on January 15, 2027 and may be redeemed in whole or in part at any time or from time to time at the Company's option prior to maturity at par plus a “make-whole” premium, if applicable. In addition, holders of the 2027 Notes can require the Company to repurchase the 2027 Notes at 100% of their principal amount upon the occurrence of certain change of control events as described in the 2027 Notes Indenture. The 2027 Notes were issued in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof. During the three and six months ended March 31, 2024, the Company did not repurchase any of the 2027 Notes in the open market. The 2027 Notes Indenture contains certain covenants, including covenants requiring the Company's compliance with the asset coverage requirements set forth in Section 18(a)(1)(A) as modified by Section 61(a)(1) and (2) of the Investment Company Act or any successor provisions (but giving effect to any exemptive relief granted to the Company by the SEC), as well as covenants requiring the Company to provide financial information to the holders of the 2027 Notes and the Trustee if the Company ceases to be subject to the reporting requirements of the Exchange Act. These covenants are subject to limitations and exceptions that are described in the 2027 Notes Indenture. In connection with the 2027 Notes, the Company entered into an interest rate swap to more closely align the interest rates of its liabilities with its investment portfolio, which consists of predominately floating rate loans. Under the interest rate swap agreement, the Company receives a fixed interest rate of 2.700% and pays a floating interest rate of the three-month SOFR plus 1.658% plus a SOFR adjustment of 0.26161% on a notional amount of $350.0 million. The Company designated the interest rate swap as the hedging instrument in an effective hedge accounting relationship. See Note 12 for more information regarding the interest rate swap. 2029 Notes On August 15, 2023, the Company issued $300.0 million in aggregate principal amount of the 2029 Notes for net proceeds of $292.9 million after deducting OID of $3.5 million, underwriting commissions and discounts of $3.0 million and offering costs of $0.6 million. The OID on the 2029 Notes is amortized based on the effective interest method over the term of the 2029 Notes. The 2029 Notes were issued pursuant to an indenture, dated April 30, 2012, as supplemented by the seventh supplemental indenture, dated August 15, 2023 (collectively, the "2029 Notes Indenture"), between the Company and the Trustee. The 2029 Notes are the Company's general unsecured obligations that rank senior in right of payment to all of the Company's existing and future indebtedness that is expressly subordinated in right of payment to the 2029 Notes. The 2029 Notes rank equally in right of payment with all of the Company's existing and future liabilities that are not so subordinated. The 2029 Notes effectively rank junior to any of the Company's secured indebtedness (including unsecured indebtedness that the Company later secures) to the extent of the value of the assets securing such indebtedness. The 2029 Notes rank structurally junior to all existing and future indebtedness (including trade payables) incurred by the Company's subsidiaries, financing vehicles or similar facilities. Interest on the 2029 Notes is paid semi-annually on February 15 and August 15 at a rate of 7.100% per annum. The 2029 Notes mature on February 15, 2029 and may be redeemed in whole or in part at any time or from time to time at the Company's option prior to maturity at par plus a “make-whole” premium, if applicable. In addition, holders of the 2029 Notes can require the Company to repurchase the 2029 Notes at 100% of their principal amount upon the occurrence of certain change of control events as described in the 2029 Notes Indenture. The 2029 Notes were issued in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof. During the three and six months ended March 31, 2024, the Company did not repurchase any of the 2029 Notes in the open market. The 2029 Notes Indenture contains certain covenants, including covenants requiring the Company's compliance with the asset coverage requirements set forth in Section 18(a)(1)(A) as modified by Section 61(a)(1) and (2) of the Investment Company Act or any successor provisions (but giving effect to any exemptive relief granted to the Company by the SEC), as well as covenants requiring the Company to provide financial information to the holders of the 2029 Notes and the Trustee if the Company ceases to be subject to the reporting requirements of the Exchange Act. These covenants are subject to limitations and exceptions that are described in the 2029 Notes Indenture. In connection with the 2029 Notes, the Company entered into an interest rate swap to more closely align the interest rates of its liabilities with its investment portfolio, which consists of predominately floating rate loans. Under the interest rate swap agreement, the Company receives a fixed interest rate of 7.100% and pays a floating interest rate of the three-month SOFR plus 3.1255% on a notional amount of $300.0 million. The Company designated the interest rate swap as the hedging instrument in an effective hedge accounting relationship. See Note 12 for more information regarding the interest rate swap.
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| 2025 Notes [Member] | ||||||||||
| Capital Stock, Long-Term Debt, and Other Securities [Abstract] | ||||||||||
| Long Term Debt, Title [Text Block] | 2025 Notes | |||||||||
| Long Term Debt, Structuring [Text Block] | On February 25, 2020, the Company issued $300.0 million in aggregate principal amount of the 2025 Notes for net proceeds of $293.8 million after deducting OID of $2.5 million, underwriting commissions and discounts of $3.0 million and offering costs of $0.7 million. The OID on the 2025 Notes is amortized based on the effective interest method over the term of the 2025 Notes. The 2025 Notes were issued pursuant to an indenture, dated April 30, 2012, as supplemented by the fifth supplemental indenture, dated February 25, 2020 (collectively, the "2025 Notes Indenture"), between the Company and Deutsche Bank Trust Company Americas (the "Trustee"). The 2025 Notes are the Company's general unsecured obligations that rank senior in right of payment to all of the Company's existing and future indebtedness that is expressly subordinated in right of payment to the 2025 Notes. The 2025 Notes rank equally in right of payment with all of the Company's existing and future liabilities that are not so subordinated. The 2025 Notes effectively rank junior to any of the Company's secured indebtedness (including unsecured indebtedness that the Company later secures) to the extent of the value of the assets securing such indebtedness. The 2025 Notes rank structurally junior to all existing and future indebtedness (including trade payables) incurred by the Company's subsidiaries, financing vehicles or similar facilities. Interest on the 2025 Notes is paid semi-annually on February 25 and August 25 at a rate of 3.500% per annum. The 2025 Notes mature on February 25, 2025 and may be redeemed in whole or in part at any time or from time to time at the Company's option prior to maturity at par plus a “make-whole” premium, if applicable. In addition, holders of the 2025 Notes can require the Company to repurchase the 2025 Notes at 100% of their principal amount upon the occurrence of certain change of control events as described in the 2025 Notes Indenture. The 2025 Notes were issued in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof. During the three and six months ended March 31, 2024, the Company did not repurchase any of the 2025 Notes in the open market.
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| Long Term Debt, Dividends and Covenants [Text Block] | The 2025 Notes Indenture contains certain covenants, including covenants requiring the Company's compliance with the asset coverage requirements set forth in Section 18(a)(1)(A) as modified by Section 61(a)(1) and (2) of the Investment Company Act or any successor provisions (but giving effect to any exemptive relief granted to the Company by the U.S. Securities and Exchange Commission ("SEC")), as well as covenants requiring the Company to provide financial information to the holders of the 2025 Notes and the Trustee if the Company ceases to be subject to the reporting requirements of the Securities Exchange Act of 1934, as amended (the "Exchange Act"). These covenants are subject to limitations and exceptions that are described in the 2025 Notes Indenture.
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| 2027 Notes [Member] | ||||||||||
| Capital Stock, Long-Term Debt, and Other Securities [Abstract] | ||||||||||
| Long Term Debt, Title [Text Block] | 2027 Notes | |||||||||
| Long Term Debt, Structuring [Text Block] | On May 18, 2021, the Company issued $350.0 million in aggregate principal amount of the 2027 Notes for net proceeds of $344.8 million after deducting OID of $1.0 million, underwriting commissions and discounts of $3.5 million and offering costs of $0.7 million. The OID on the 2027 Notes is amortized based on the effective interest method over the term of the 2027 Notes. The 2027 Notes were issued pursuant to an indenture, dated April 30, 2012, as supplemented by the sixth supplemental indenture, dated May 18, 2021 (collectively, the "2027 Notes Indenture"), between the Company and the Trustee. The 2027 Notes are the Company's general unsecured obligations that rank senior in right of payment to all of the Company's existing and future indebtedness that is expressly subordinated in right of payment to the 2027 Notes. The 2027 Notes rank equally in right of payment with all of the Company's existing and future liabilities that are not so subordinated. The 2027 Notes effectively rank junior to any of the Company's secured indebtedness (including unsecured indebtedness that the Company later secures) to the extent of the value of the assets securing such indebtedness. The 2027 Notes rank structurally junior to all existing and future indebtedness (including trade payables) incurred by the Company's subsidiaries, financing vehicles or similar facilities. Interest on the 2027 Notes is paid semi-annually on January 15 and July 15 at a rate of 2.700% per annum. The 2027 Notes mature on January 15, 2027 and may be redeemed in whole or in part at any time or from time to time at the Company's option prior to maturity at par plus a “make-whole” premium, if applicable. In addition, holders of the 2027 Notes can require the Company to repurchase the 2027 Notes at 100% of their principal amount upon the occurrence of certain change of control events as described in the 2027 Notes Indenture. The 2027 Notes were issued in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof. During the three and six months ended March 31, 2024, the Company did not repurchase any of the 2027 Notes in the open market.
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| Long Term Debt, Dividends and Covenants [Text Block] | The 2027 Notes Indenture contains certain covenants, including covenants requiring the Company's compliance with the asset coverage requirements set forth in Section 18(a)(1)(A) as modified by Section 61(a)(1) and (2) of the Investment Company Act or any successor provisions (but giving effect to any exemptive relief granted to the Company by the SEC), as well as covenants requiring the Company to provide financial information to the holders of the 2027 Notes and the Trustee if the Company ceases to be subject to the reporting requirements of the Exchange Act. These covenants are subject to limitations and exceptions that are described in the 2027 Notes Indenture. | |||||||||
| 2029 Notes [Member] | ||||||||||
| Capital Stock, Long-Term Debt, and Other Securities [Abstract] | ||||||||||
| Long Term Debt, Title [Text Block] | 2029 Notes | |||||||||
| Long Term Debt, Structuring [Text Block] | On August 15, 2023, the Company issued $300.0 million in aggregate principal amount of the 2029 Notes for net proceeds of $292.9 million after deducting OID of $3.5 million, underwriting commissions and discounts of $3.0 million and offering costs of $0.6 million. The OID on the 2029 Notes is amortized based on the effective interest method over the term of the 2029 Notes. The 2029 Notes were issued pursuant to an indenture, dated April 30, 2012, as supplemented by the seventh supplemental indenture, dated August 15, 2023 (collectively, the "2029 Notes Indenture"), between the Company and the Trustee. The 2029 Notes are the Company's general unsecured obligations that rank senior in right of payment to all of the Company's existing and future indebtedness that is expressly subordinated in right of payment to the 2029 Notes. The 2029 Notes rank equally in right of payment with all of the Company's existing and future liabilities that are not so subordinated. The 2029 Notes effectively rank junior to any of the Company's secured indebtedness (including unsecured indebtedness that the Company later secures) to the extent of the value of the assets securing such indebtedness. The 2029 Notes rank structurally junior to all existing and future indebtedness (including trade payables) incurred by the Company's subsidiaries, financing vehicles or similar facilities. Interest on the 2029 Notes is paid semi-annually on February 15 and August 15 at a rate of 7.100% per annum. The 2029 Notes mature on February 15, 2029 and may be redeemed in whole or in part at any time or from time to time at the Company's option prior to maturity at par plus a “make-whole” premium, if applicable. In addition, holders of the 2029 Notes can require the Company to repurchase the 2029 Notes at 100% of their principal amount upon the occurrence of certain change of control events as described in the 2029 Notes Indenture. The 2029 Notes were issued in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof. During the three and six months ended March 31, 2024, the Company did not repurchase any of the 2029 Notes in the open market.
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| Long Term Debt, Dividends and Covenants [Text Block] | The 2029 Notes Indenture contains certain covenants, including covenants requiring the Company's compliance with the asset coverage requirements set forth in Section 18(a)(1)(A) as modified by Section 61(a)(1) and (2) of the Investment Company Act or any successor provisions (but giving effect to any exemptive relief granted to the Company by the SEC), as well as covenants requiring the Company to provide financial information to the holders of the 2029 Notes and the Trustee if the Company ceases to be subject to the reporting requirements of the Exchange Act. These covenants are subject to limitations and exceptions that are described in the 2029 Notes Indenture. In connection with the 2029 Notes, the Company entered into an interest rate swap to more closely align the interest rates of its liabilities with its investment portfolio, which consists of predominately floating rate loans. Under the interest rate swap agreement, the Company receives a fixed interest rate of 7.100% and pays a floating interest rate of the three-month SOFR plus 3.1255% on a notional amount of $300.0 million. The Company designated the interest rate swap as the hedging instrument in an effective hedge accounting relationship. See Note 12 for more information regarding the interest rate swap.
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| Syndicated Facility [Member] | ||||||||||
| Capital Stock, Long-Term Debt, and Other Securities [Abstract] | ||||||||||
| Long Term Debt, Title [Text Block] | Syndicated Facility | |||||||||
| Long Term Debt, Structuring [Text Block] | On November 30, 2017, the Company entered into a senior secured revolving credit facility (as amended and restated, the “Syndicated Facility”) pursuant to a Senior Secured Revolving Credit Agreement with the lenders party thereto, ING Capital LLC, as administrative agent, ING Capital LLC, JPMorgan Chase Bank, N.A., BofA Securities, Inc. and MUFG Union Bank, N.A., as joint lead arrangers and joint bookrunners, and JPMorgan Chase Bank, N.A. and Bank of America, N.A., as syndication agents. The Syndicated Facility provides that the Company may use the proceeds of the loans and issuances of letters of credit under the Syndicated Facility for general corporate purposes, including acquiring and funding leveraged loans, mezzanine loans, high-yield securities, convertible securities, preferred stock, common stock and other investments. The Syndicated Facility further allows the Company to request letters of credit from ING Capital LLC, as the issuing bank. As of March 31, 2024, the size of the Syndicated Facility was $1.218 billion. In addition, pursuant to an "accordion" feature, the Company may increase the size of the facility to up to the greater of $1.25 billion and the Company's net worth, as defined in the facility, under certain circumstances. As of March 31, 2024, (i) the period during which the Company may make drawings with respect to $1.035 billion of commitments will expire on June 23, 2027 and the maturity date is June 23, 2028, (ii) the period during which the Company may make drawings with respect to the remaining commitments will expire on May 4, 2025 and the maturity date is May 4, 2026 and (iii) the interest rate margin for (a) SOFR loans (which may be 1- or 3-month, at the Company’s option) was 2.00% plus a SOFR adjustment which ranges between 0.11448% and 0.26161% and (b) alternate base rate loans was 1.00%. The Syndicated Facility is secured by substantially all of the Company’s assets (excluding, among other things, investments held in and by certain subsidiaries of the Company (including OSI 2 Senior Lending SPV, LLC, or “OSI 2 SPV”) or investments in certain portfolio companies of the Company) and guaranteed by certain subsidiaries of the Company.
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| Long Term Debt, Dividends and Covenants [Text Block] | The Syndicated Facility requires the Company to, among other things, (i) make representations and warranties regarding the collateral as well as each of the Company’s portfolio companies’ businesses, (ii) agree to certain indemnification obligations, and (iii) comply with various affirmative and negative covenants, reporting requirements and other customary requirements for similar revolving credit facilities, including covenants related to: (A) limitations on the incurrence of additional indebtedness and liens, (B) limitations on certain investments, (C) limitations on certain asset transfers and restricted payments, (D) maintaining a certain minimum stockholders’ equity, (E) maintaining a ratio of total assets (less total liabilities) to total indebtedness, of the Company and its subsidiaries (subject to certain exceptions), of not less than 1.50 to 1.00, (F) maintaining a ratio of consolidated EBITDA to consolidated interest expense, of the Company and its subsidiaries (subject to certain exceptions), of not less than 2.25 to 1.00, (G) maintaining a minimum liquidity and net worth, and (H) limitations on the creation or existence of agreements that prohibit liens on certain properties of the Company and certain of its subsidiaries. The Syndicated Facility also includes usual and customary default provisions such as the failure to make timely payments under the facility, the occurrence of a change in control, and the failure by the Company to materially perform under the agreements governing the facility, which, if not complied with, could accelerate repayment under the facility. As of March 31, 2024, the Company was in compliance with all financial covenants under the Syndicated Facility. In addition to the asset coverage ratio described above, borrowings under the Syndicated Facility (and the incurrence of certain other permitted debt) are subject to compliance with a borrowing base that will apply different advance rates to different types of assets in the Company’s portfolio. Each loan or letter of credit originated or assumed under the Syndicated Facility is subject to the satisfaction of certain conditions. | |||||||||
| Citibank Facility [Member] | ||||||||||
| Capital Stock, Long-Term Debt, and Other Securities [Abstract] | ||||||||||
| Long Term Debt, Title [Text Block] | Citibank Facility | |||||||||
| Long Term Debt, Structuring [Text Block] | On March 19, 2021, the Company became party to a revolving credit facility (as amended and/or restated from time to time, the “Citibank Facility”) with OCSL Senior Funding II LLC, the Company’s wholly-owned, special purpose financing subsidiary, as the borrower, the Company, as collateral manager and seller, each of the lenders from time to time party thereto, Citibank, N.A., as administrative agent, and Wells Fargo Bank, National Association, as collateral agent and custodian. On May 25, 2023, in connection with an amendment to the OSI2 Citibank Facility, the Citibank Facility was terminated. | |||||||||
| OSI2 Citibank Facility [Member] | ||||||||||
| Capital Stock, Long-Term Debt, and Other Securities [Abstract] | ||||||||||
| Long Term Debt, Title [Text Block] | OSI2 Citibank Facility | |||||||||
| Long Term Debt, Structuring [Text Block] | On January 23, 2023, as a result of the consummation of the OSI2 Merger, the Company became party to a revolving credit facility (as amended and/or restated from time to time, the “OSI2 Citibank Facility”) with OSI 2 SPV, the Company’s wholly-owned and consolidated subsidiary, as the borrower, the Company, as collateral manager, each of the lenders from time to time party thereto, Citibank, N.A., as administrative agent, and Deutsche Bank Trust Company Americas, as collateral agent. As of March 31, 2024, the Company was able to borrow up to $400 million under the OSI2 Citibank Facility (subject to borrowing base and other limitations).
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| Long Term Debt, Dividends and Covenants [Text Block] | As of March 31, 2024, the OSI2 Citibank Facility had a reinvestment period through May 25, 2025, during which advances may be made, and matures on January 26, 2027. Following the reinvestment period, OSI 2 SPV will be required to make certain mandatory amortization payments. Borrowings under the OSI2 Citibank Facility bear interest payable quarterly at a rate per year equal to (a) in the case of a lender that is identified as a conduit lender, the lesser of (i) the applicable commercial paper rate for such conduit lender and (ii) SOFR plus 2.00% per annum on broadly syndicated loans and 2.75% on all other eligible loans and (b) for all other lenders, SOFR plus 2.00% per annum on broadly syndicated loans and 2.75% per annum on all other eligible loans, in all cases subject to a minimum overall rate of SOFR plus 2.50% per annum. After the reinvestment period, the applicable spread is 4.00% per year. There is also a non-usage fee of 0.50% per year on the unused portion of the OSI2 Citibank Facility, payable quarterly; provided that if the unused portion of the OSI2 Citibank Facility is greater than 30% of the commitments under the OSI2 Citibank Facility, the non-usage fee will be based on an unused portion of 30% of the commitments under the OSI2 Citibank Facility. The OSI2 Citibank Facility is secured by a first priority security interest in substantially all of OSI 2 SPV’s assets. As part of the OSI2 Citibank Facility, OSI 2 SPV is subject to certain limitations as to how borrowed funds may be used and the types of loans that are eligible to be acquired by OSI 2 SPV including restrictions on sector concentrations, loan size, tenor and minimum investment ratings (or estimated ratings). The OSI2 Citibank Facility also contains certain requirements relating to interest coverage, collateral quality and portfolio performance, certain violations of which could result in the acceleration of the amounts due under the OSI2 Citibank Facility. | |||||||||
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