N-2 - $ / shares	6 Months Ended
N-2 - $ / shares	Jun. 30, 2025	Dec. 31, 2024
Cover [Abstract]
Entity Central Index Key	0001850787
Amendment Flag	false
Securities Act File Number	814-01393
Document Type	10-Q
Entity Registrant Name	Kayne DL 2021, Inc.
Entity Address, Address Line One	717 Texas Avenue
Entity Address, Address Line Two	Suite 2200
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77002
City Area Code	(713)
Local Phone Number	493-2020
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
General Description of Registrant [Abstract]
Investment Objectives and Practices [Text Block]	*Investment Objective, Principal Strategy and Investment Structure* Kayne DL 2021, Inc. is a Delaware corporation formed to make investments in middle-market companies and commenced operations on December 16, 2021. We are an externally managed, closed-end, non-diversified management investment company that has elected to be regulated as a BDC under the 1940 Act, as amended. In addition, for U.S. federal income tax purposes, we intend to qualify, annually, as a RIC under Subchapter M of the Code. Our investment activities are managed by KA Credit Advisors II, LLC (the “Advisor”), an indirect controlled subsidiary of Kayne Anderson Capital Advisors, L.P. (“Kayne Anderson”), and the Advisor operates within Kayne Anderson’s middle market private credit platform (“KAPC” or “Kayne Anderson Private Credit”). The Advisor is an investment advisor registered with the United States Securities and Exchange Commission (the “SEC”) under the Investment Advisers Act of 1940, as amended (the “Advisers Act”). In accordance with the Advisers Act, our Advisor is responsible for originating prospective investments, conducting research and due diligence investigations on potential investments, analyzing investment opportunities, negotiating and structuring investments, and monitoring our investments and portfolio companies on an ongoing basis. The Advisor benefits from the scale and resources of Kayne Anderson and specifically KAPC. Our investment objective is to generate current income and, to a lesser extent, capital appreciation. We intend to have nearly all of our debt investments in private middle market companies. We use “private” to refer to companies that are not traded on a securities exchange and define “middle market companies” as companies that, in general, generate between $10 million and $150 million of annual earnings before interest, taxes, depreciation and amortization, or EBITDA. Further, we refer to companies that generate between $10 million and $50 million of annual EBITDA as “core middle market companies” and companies that generate between $50 million and $150 million of annual EBITDA as “upper middle market companies.” We typically adjust EBITDA for non-recurring and/or normalizing items to assess the financial performance of our borrowers over time. We intend to achieve our investment objective by investing primarily in first lien senior secured loans, with a secondary focus on unitranche and split-lien loans to middle market companies. Under normal market conditions, we expect at least 90% of our portfolio (including investments purchased with proceeds from borrowings under credit facilities) to be invested in first lien senior secured, unitranche and split-lien loans. Our investment decisions are made on a case-by-case basis. We expect that a majority of these debt investments will be made in core middle market companies and will generally have stated maturities of three to six years. We expect that the loans in which we principally invest will be to companies that are located in the United States. We determine the location of a company as being in the United States by (i) such company being organized under the laws of one of the states in the United States; or (ii) during its most recent fiscal year, such company derived at least 50% of its revenues or profits from goods produced or sold, investments made, or services performed in the United States or has at least 50% of its assets in the United States. The Advisor executes on our investment objective by (1) accessing the established loan sourcing channels developed by KAPC, which includes an extensive network of private equity firms, other middle market lenders, financial advisors, intermediaries and management teams, (2) selecting investments within our middle market company focus, (3) implementing KAPC’s underwriting process and (4) drawing upon its experience and resources and the broader Kayne Anderson network. KAPC was established in 2011 and manages (directly and through affiliates) assets under management (“AUM”) of approximately $7.2 billion related to middle market private credit as of June 30, 2025.
Risk Factors [Table Text Block]	Item 1A. Risk Factors. In addition to the other information set forth in this report, you should carefully consider the risk factors described below and in Part I, “Item 1A. Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2024, which could materially affect our business, financial condition and/or operating results. The risks described in our Annual Report on Form 10-K for the fiscal year ended December 31, 2024 are not the only risks facing us. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially and adversely affect our business, financial condition and/or operating results. *Changes to U.S. tariff and import/export regulations may have a negative effect on our portfolio companies and, in turn, on our performance.* There have been recent proposed changes to United States trade policies, treaties and tariffs, and, in the future, there may be additional significant changes. These and any future developments, and continued uncertainty surrounding trade policies, treaties and tariffs, may have a material adverse effect on global economic conditions, inflation and the stability of global financial markets, and may significantly reduce global trade and, in particular, trade between the impacted nations and the United States. Any of these factors could depress economic activity and restrict our portfolio companies’ access to suppliers or customers, increase their supply-chain costs and expenses.
NAV Per Share	$ 5,259	$ 5,259
Changes to U.S. tariff and import/export regulations may have a negative effect on our portfolio companies and, in turn, on our performance. [Member]
General Description of Registrant [Abstract]
Risk [Text Block]	*Changes to U.S. tariff and import/export regulations may have a negative effect on our portfolio companies and, in turn, on our performance.* There have been recent proposed changes to United States trade policies, treaties and tariffs, and, in the future, there may be additional significant changes. These and any future developments, and continued uncertainty surrounding trade policies, treaties and tariffs, may have a material adverse effect on global economic conditions, inflation and the stability of global financial markets, and may significantly reduce global trade and, in particular, trade between the impacted nations and the United States. Any of these factors could depress economic activity and restrict our portfolio companies’ access to suppliers or customers, increase their supply-chain costs and expenses.

Kayne DL 2021, Inc. 10-Q