XML 11 R1.htm IDEA: XBRL DOCUMENT v3.26.1
Cover - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2025
Mar. 24, 2026
Jun. 30, 2025
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2025    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2025    
Current Fiscal Year End Date --12-31    
Entity File Number 001-42280    
Entity Registrant Name CAYSON ACQUISITION CORP    
Entity Central Index Key 0002024203    
Entity Tax Identification Number 00-0000000    
Entity Incorporation, State or Country Code E9    
Entity Address, Address Line One 420 Lexington Ave    
Entity Address, Address Line Two Suite 2446    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10170    
City Area Code (203)    
Local Phone Number 998-5540    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company true    
Elected Not To Use the Extended Transition Period false    
Entity Shell Company true    
Entity Public Float     $ 61.9
Entity Common Stock, Shares Outstanding   5,288,092  
Documents Incorporated by Reference [Text Block] None    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Listing, Par Value Per Share $ 0.0001    
Auditor Firm ID 206    
Auditor Opinion [Text Block] We have audited the accompanying balance sheets of Cayson Acquisition Corp (the “Company”) as of December 31, 2025 and 2024, and the related statements of operations, changes in shareholders’ deficit, and cash flows for the year ended December 31, 2025 and for the period from May 27, 2024 (inception) through December 31, 2024, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2025 and 2024, and the results of its operations and its cash flows for the year ended December 31, 2025 and for the period from May 27, 2024 (inception) through December 31, 2024, in conformity with accounting principles generally accepted in the United States of America.    
Auditor Name MaloneBailey, LLP    
Auditor Location Houston, Texas    
Units, each consisting of one ordinary share and one right      
Title of 12(b) Security Units, each consisting of one ordinary share and one right    
Trading Symbol CAPNU    
Security Exchange Name NASDAQ    
Ordinary Shares, par value $0.0001 per share      
Title of 12(b) Security Ordinary Shares, par value $0.0001 per share    
Trading Symbol CAPN    
Security Exchange Name NASDAQ    
Rights, each entitling the holder to one-tenth of one ordinary share upon the completion of the Company’s initial business combination      
Title of 12(b) Security Rights, each entitling the holder to one-tenth of one ordinary share upon the completion of the Company’s initial business combination    
Trading Symbol CAPNR    
Security Exchange Name NASDAQ