v3.26.1
Document And Entity Information - shares
 6 Months Ended
Jun. 30, 2026
Aug. 13, 2026
Document Information Line Items    
Entity Central Index Key 0002125551  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Fiscal Year Focus 2026  
Document Transition Report false  
Entity File Number 001-43369  
Entity Registrant Name Alpex Acquisition Corporation  
Entity Incorporation, State or Country Code E9  
Entity Tax Identification Number 00-0000000  
Entity Address, Address Line One 300 Delaware Ave.  
Entity Address, Address Line Two Suite 210 #494  
Entity Address, City or Town Wilmington  
Entity Address, State or Province DE  
Entity Address, Postal Zip Code 19801  
City Area Code (302)  
Local Phone Number 251-6637  
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  
Entity Ex Transition Period false  
Entity Shell Company true  
Amendment Flag false  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --12-31  
Units, consisting of one Class A ordinary share, $0.0001 par value, one redeemable Warrant to acquire one Class A ordinary share, and one Right to acquire one-fourth of one Class A ordinary share    
Document Information Line Items    
Title of 12(b) Security Units, consisting of one Class A ordinary share, $0.0001 par value, one redeemable Warrant to acquire one Class A ordinary share, and one Right  
Trading Symbol ALPXU  
Security Exchange Name NASDAQ  
Class AOrdinary Shares Par Value00001 Per Share Member    
Document Information Line Items    
Title of 12(b) Security Class A ordinary shares, par value $0.0001 per share  
Trading Symbol ALPX  
Security Exchange Name NASDAQ  
Redeemable Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50    
Document Information Line Items    
Title of 12(b) Security Redeemable Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50  
Trading Symbol ALPXW  
Security Exchange Name NASDAQ  
Rights, each whole right to acquire one-fourth of one Class A ordinary share    
Document Information Line Items    
Title of 12(b) Security Rights, each whole right to acquire one-fourth of one Class A ordinary share  
Trading Symbol ALPXR  
Security Exchange Name NASDAQ  
Class A Ordinary Shares    
Document Information Line Items    
Entity Common Stock, Shares Outstanding   11,917,500
Class B Ordinary Shares    
Document Information Line Items    
Entity Common Stock, Shares Outstanding   2,875,000