N-2 - USD ($) |
6 Months Ended | ||||||
|---|---|---|---|---|---|---|---|
Mar. 31, 2026 |
Sep. 30, 2025 |
Mar. 31, 2025 |
Feb. 14, 2025 |
Dec. 17, 2024 |
Nov. 05, 2024 |
Sep. 30, 2024 |
|
| Cover [Abstract] | |||||||
| Entity Central Index Key | 0001901606 | ||||||
| Amendment Flag | false | ||||||
| Securities Act File Number | 814-01505 | ||||||
| Document Type | 10-Q | ||||||
| Entity Registrant Name | Golub Capital Direct Lending Unlevered Corporation | ||||||
| Entity Address, Address Line One | 200 Park Avenue | ||||||
| Entity Address, Address Line Two | 25th Floor | ||||||
| Entity Address, City or Town | New York | ||||||
| Entity Address, State or Province | NY | ||||||
| Entity Address, Postal Zip Code | 10166 | ||||||
| City Area Code | 212 | ||||||
| Local Phone Number | 750-6060 | ||||||
| Entity Emerging Growth Company | true | ||||||
| Entity Ex Transition Period | true | ||||||
| Financial Highlights [Abstract] | |||||||
| Senior Securities Amount | $ 0 | $ 0 | |||||
| General Description of Registrant [Abstract] | |||||||
| Investment Objectives and Practices [Text Block] | Our investment objective is to generate current income and capital appreciation by investing primarily in one stop (a loan that combines characteristics of traditional first lien senior secured loans and second lien or subordinated loans and that are often referred to by other middle-market lenders as unitranche loans) and other senior secured loans of U.S. middle-market companies. We also selectively invest in second lien and subordinated loans of, and warrants and minority equity securities in U.S. middle-market companies. We intend to achieve our investment objective by (1) accessing the established loan origination channels developed by Golub Capital, a leading lender to U.S. middle-market companies with over $90.0 billion in capital under management(1) as of January 1, 2026, (2) selecting investments within our core middle-market company focus, (3) partnering with experienced private equity firms, or sponsors, in many cases with whom Golub Capital has invested alongside in the past, (4) implementing the disciplined underwriting standards of Golub Capital and (5) drawing upon the aggregate experience and resources of Golub Capital.
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| Risk Factors [Table Text Block] | Risk Factors.There have been no material changes during the six months ended March 31, 2026 to the risk factors discussed in Item 1A. Risk Factors in our Annual Report on Form 10-K for the year ended September 30, 2025. | ||||||
| NAV Per Share | $ 14.95 | $ 15.00 | $ 15.00 | $ 15.00 | $ 15.00 | $ 15.00 | $ 15.00 |