v3.26.1
Cover - shares
 6 Months Ended
Jun. 30, 2026
Aug. 13, 2026
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 Jun. 30, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Entity Information [Line Items]    
Entity Registrant Name Oceanhawk Acquisition Corp.  
Entity Central Index Key 0002090787  
Entity File Number 001-43309  
Entity Tax Identification Number 98-1886973  
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 515 Madison Avenue  
Entity Address, Address Line Two 8th Floor  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10022  
Entity Phone Fax Numbers [Line Items]    
City Area Code 212  
Local Phone Number 212-931-1898  
Units, each consisting of one Class A ordinary share and one right to receive one-fourth of one Class A ordinary share    
Entity Listings [Line Items]    
Title of 12(b) Security 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    
Entity Listings [Line Items]    
Title of 12(b) Security 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    
Entity Listings [Line Items]    
Title of 12(b) Security Rights, each right to receive one-fourth of one Class A ordinary share  
Trading Symbol OHACR  
Security Exchange Name NASDAQ  
Class A Ordinary Shares    
Entity Listings [Line Items]    
Entity Common Stock, Shares Outstanding   18,930,000
Class B Ordinary Shares    
Entity Listings [Line Items]    
Entity Common Stock, Shares Outstanding   6,133,333