v3.25.2
Cover
Jul. 14, 2025
Cover [Abstract]  
Entity Registrant Name Golub Capital Direct Lending Unlevered Corporation
Document Type 8-K
Document Period End Date Jul. 14, 2025
Local Phone Number 750-6060
City Area Code 212
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
Entity Ex Transition Period true
Entity Emerging Growth Company true
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Central Index Key 0001901606
Amendment Flag false
Entity Incorporation, State or Country Code MD
Securities Act File Number 814-01505
Entity Tax Identification Number 88-1632039