v3.26.1
Cover - $ / shares
6 Months Ended
Jun. 30, 2026
Aug. 12, 2026
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2026  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2026  
Current Fiscal Year End Date --12-31  
Entity File Number 001-43084  
Entity Registrant Name UNITED ACQUISITION CORP. I  
Entity Central Index Key 0002098669  
Entity Tax Identification Number 98-1893434  
Entity Incorporation, State or Country Code E9  
Entity Address, Address Line One 7100 W. Camino Real  
Entity Address, Address Line Two Suite 302-48  
Entity Address, City or Town Boca Raton  
Entity Address, State or Province FL  
Entity Address, Postal Zip Code 33433  
City Area Code (212)  
Local Phone Number 847-3248  
Entity Current Reporting Status Yes  
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  
Units, each consisting of one Class A ordinary share and one-quarter of one redeemable warrant    
Title of 12(b) Security Units, each consisting of one Class A ordinary share and one-quarter of one redeemable warrant  
Trading Symbol UACU  
Security Exchange Name NYSEAMER  
Class A ordinary shares, par value $0.0001 per share    
Title of 12(b) Security Class A ordinary shares, par value $0.0001 per share  
Trading Symbol UAC  
Security Exchange Name NYSEAMER  
Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50    
Title of 12(b) Security Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50  
Trading Symbol UACW  
Security Exchange Name NYSEAMER  
Common Class A [Member]    
Entity Common Stock, Shares Outstanding   10,459,580
Entity Listing, Par Value Per Share $ 0.0001  
Common Class B [Member]    
Entity Common Stock, Shares Outstanding   3,394,100
Entity Listing, Par Value Per Share $ 0.0001