Cover - shares	9 Months Ended
	Sep. 30, 2025	Nov. 14, 2025
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Amendment Flag	false
Document Period End Date	Sep. 30, 2025
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q3
Entity Information [Line Items]
Entity Registrant Name	Columbus Acquisition Corp/Cayman Islands
Entity Central Index Key	0002028201
Entity File Number	001-42485
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 Contact Personnel [Line Items]
Entity Address, Address Line One	14 Prudential Tower
Entity Address, City or Town	Singapore
Entity Address, Country	SG
Entity Address, Postal Zip Code	049712
Entity Phone Fax Numbers [Line Items]
City Area Code	(+1)
Local Phone Number	949 899 1827
Entity Listings [Line Items]
Entity Common Stock, Shares Outstanding		7,944,290
Units, consisting of one ordinary share, $0.0001 par value, and one Right to acquire one-seventh of one ordinary share
Entity Listings [Line Items]
Title of 12(b) Security	Units, consisting of one Ordinary Share, $0.0001 par value, and one Right to acquire one-seventh of one Ordinary Share
Trading Symbol	COLAU
Security Exchange Name	NASDAQ
Ordinary shares, par value $0.0001 per share
Entity Listings [Line Items]
Title of 12(b) Security	Ordinary shares, par value $0.0001 per share
Trading Symbol	COLA
Security Exchange Name	NASDAQ
Rights, each whole right to acquire one-seventh of one ordinary share
Entity Listings [Line Items]
Title of 12(b) Security	Rights, each whole right to acquire one-seventh of one ordinary share
Trading Symbol	COLAR
Security Exchange Name	NASDAQ