v3.26.1
Cover - $ / shares
 3 Months Ended
Mar. 31, 2026
Jul. 31, 2026
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Mar. 31, 2026  
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2026  
Current Fiscal Year End Date --12-31  
Entity File Number 001-40981  
Entity Registrant Name Cactus Acquisition Corp. 1 Ltd.  
Entity Central Index Key 0001865861  
Entity Tax Identification Number 00-0000000  
Entity Incorporation, State or Country Code E9  
Entity Address, Address Line One 11 Deer Park Drive  
Entity Address, Address Line Two Suite 204  
Entity Address, City or Town Monmouth Junction  
Entity Address, State or Province NJ  
Entity Address, Postal Zip Code 088512  
City Area Code (609)  
Local Phone Number 495-2216  
Entity Current Reporting Status No  
Entity Interactive Data Current No  
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  
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 CCTSF  
Redeemable warrants, each warrant exercisable for one Class A ordinary share at an exercise price of $11.50    
Title of 12(b) Security Redeemable warrants, each warrant exercisable for one Class A ordinary share at an exercise price of $11.50  
Trading Symbol CTSWF  
Units, each consisting of one Class A ordinary share and one-half of a redeemable warrant    
Title of 12(b) Security Units, each consisting of one Class A ordinary share and one-half of a redeemable warrant  
Trading Symbol CTSUF  
Common Class A [Member]    
Entity Common Stock, Shares Outstanding   3,926,061
Entity Listing, Par Value Per Share $ 0.0001  
Common Class B [Member]    
Entity Common Stock, Shares Outstanding   1
Entity Listing, Par Value Per Share $ 0.0001