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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2024
Mar. 05, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2024    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Document Annual Report true    
Document Transition Report false    
Entity Registrant Name Onex Direct Lending BDC Fund    
No Trading Symbol Flag true    
Entity Central Index Key 0001860424    
Current Fiscal Year End Date --12-31    
Securities Act File Number 814-01405    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 86-3687484    
Entity Address, Address Line One 930 Sylvan Avenue    
Entity Address, City or Town Englewood Cliffs,    
Entity Address, State or Province NJ    
Entity Address, Postal Zip Code 07632    
City Area Code 201    
Local Phone Number 541-2121    
Title of 12(b) Security None    
Security Exchange Name NONE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Auditor Name DELOITTE & TOUCHE LLP    
Auditor Location Boston, MA    
Auditor Firm ID 34    
Entity Common Stock, Shares Outstanding   10,797,540  
Entity Public Float     $ 0
Auditor Opinion [Text Block]

Opinion on the Financial Statements and Financial Highlights

We have audited the accompanying consolidated statements of assets and liabilities of Onex Direct Lending BDC Fund and subsidiaries (the "Company"), including the consolidated schedules of investments, as of December 31, 2024 and 2023, the related consolidated statements of operations, changes in net assets, and cash flows for each of the three years in the period then ended, the financial highlights for the years ended December 31, 2024, 2023, 2022 and the period from October 1, 2021 (commencement of operations) through December 31, 2021, and the related notes. In our opinion, the financial statements and financial highlights present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of its operations, changes in net assets, and cash flows for each of the three years in the period then ended, and the financial highlights for the years ended December 31, 2024, 2023, 2022 and the period from October 1, 2021 (commencement of operations) through December 31, 2021 in conformity with accounting principles generally accepted in the United States of America.