v3.26.1
Cover
Jun. 26, 2026
Document Type 8-K
Amendment Flag false
Document Period End Date Jun. 26, 2026
Entity File Number 001-43112
Entity Registrant Name COLUMBUS CIRCLE CAPITAL CORP II
Entity Central Index Key 0002088805
Entity Tax Identification Number 98-1890239
Entity Incorporation, State or Country Code E9
Entity Address, Address Line One 3 Columbus Circle
Entity Address, Address Line Two 24th Floor
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10019
City Area Code 646
Local Phone Number 792-5600
Written Communications true
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false
Units, each consisting of one Class A ordinary share and one-third of one redeemable warrant  
Title of 12(b) Security Units, each consisting of one Class A ordinary share and one-third of one redeemable warrant
Trading Symbol CMIIU
Security Exchange Name NASDAQ
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 CMII
Security Exchange Name NASDAQ
Redeemable warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share  
Title of 12(b) Security Redeemable warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share
Trading Symbol CMIIW
Security Exchange Name NASDAQ