v3.26.3
Document and Entity Information
Sep. 30, 2026
Document And Entity Information [Line Items]  
Document Type 8-K
Document Period End Date Sep. 30, 2026
Entity Registrant Name Oceanhawk Acquisition Corp.
Entity Incorporation State Country Code E9
Entity File Number 001-43309
Entity Tax Identification Number 98-1886973
Entity Address Address Line 1 515 Madison Avenue
Entity Address Address Line 2 8th Floor
Entity Address City Or Town New York
Entity Address State Or Province NY
Entity Address Postal Zip Code 10022
City Area Code 212
Local Phone Number 931-1898
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Entity Emerging Growth Company true
Entity Ex Transition Period false
Entity Central Index Key 0002090787
Amendment Flag false
Pre Commencement Issuer Tender Offer false
Units, each consisting of one Class A ordinary share and one-right to receive one-fourth of one Class A ordinary share [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Units, each consisting of one Class A ordinary share and one-right to receive one-fourth of one Class A ordinary share
Trading Symbol OHACU
Security Exchange Name NASDAQ
Class A ordinary share, par value $0.0001 per share [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Class A ordinary share, par value $0.0001 per share
Trading Symbol OHAC
Security Exchange Name NASDAQ
Rights, each right to receive one-fourth of one Class A ordinary share [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Rights, each right to receive one-fourth of one Class A ordinary share
Trading Symbol OHACR
Security Exchange Name NASDAQ