v3.26.1
Cover - shares
 6 Months Ended
Jun. 30, 2026
Aug. 12, 2026
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Amendment Flag false  
Entity Interactive Data Current Yes  
Document Period End Date Jun. 30, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Entity Registrant Name K2 CAPITAL ACQUISITION CORP.  
Entity Central Index Key 0002086524  
Entity File Number 001-43086  
Entity Tax Identification Number 00-0000000  
Entity Incorporation, State or Country Code E9  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Shell Company true  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Address, Address Line One 244 Fifth Avenue  
Entity Address, Address Line Two Suite #1833  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10001  
City Area Code +1 (236)  
Local Phone Number 521-6500  
Class A Ordinary Shares    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   14,126,875
Class B Ordinary Shares    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   5,914,286
Units, each consisting of one Class A ordinary share, par value of $0.0001, and one right to receive one-fifth (1/5) of one Class A ordinary share    
Document Information [Line Items]    
Title of 12(b) Security Units, each consisting of one Class A ordinary share, par value of $0.0001, and one right to receive one-fifth (1/5) of one Class A ordinary share  
Trading Symbol KTWOU  
Security Exchange Name NASDAQ  
Class A ordinary shares included as part of the units    
Document Information [Line Items]    
Title of 12(b) Security Class A ordinary shares included as part of the units  
Trading Symbol KTWO  
Security Exchange Name NASDAQ  
Rights included as part of the units    
Document Information [Line Items]    
Title of 12(b) Security Rights included as part of the units  
Trading Symbol KTWOR  
Security Exchange Name NASDAQ