XML 12 R1.htm IDEA: XBRL DOCUMENT v3.25.3
Cover - shares
 9 Months Ended
Sep. 30, 2025
Nov. 11, 2025
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Sep. 30, 2025  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2025  
Current Fiscal Year End Date --12-31  
Entity File Number 001-41134  
Entity Registrant Name YHN Acquisition I Limited  
Entity Central Index Key 0002020987  
Entity Tax Identification Number 00-0000000  
Entity Incorporation, State or Country Code D8  
Entity Address, Address Line One 2/F, Hang Seng Building  
Entity Address, Address Line Two 200 Hennessy Road  
Entity Address, City or Town Wanchai  
Entity Address, Country HK  
Entity Address, Postal Zip Code 00000  
City Area Code 852  
Local Phone Number 5499 8101  
Entity Current Reporting Status No  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Elected Not To Use the Extended Transition Period false  
Entity Shell Company true  
Entity Common Stock, Shares Outstanding   7,750,000
Units [Member]    
Title of 12(b) Security Units, each consisting of one Ordinary Share, no par value, and one Right entitling the holder to receive one-tenth of an Ordinary Share  
Trading Symbol YHNAU  
Security Exchange Name NASDAQ  
Ordinary Share [Member]    
Title of 12(b) Security Ordinary Share  
Trading Symbol YHNA  
Security Exchange Name NASDAQ  
Rights [Member]    
Title of 12(b) Security Rights  
Trading Symbol YHNAR  
Security Exchange Name NASDAQ