v3.26.1
Document And Entity Information - shares
 6 Months Ended
Jun. 30, 2026
Aug. 12, 2026
Document Information [Line Items]    
Entity Central Index Key 0001890361  
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 001-42401  
Entity Registrant Name ASPAC III Acquisition Corp.  
Entity Incorporation, State or Country Code D8  
Entity Tax Identification Number 00-0000000  
Entity Address, Address Line One The Sun’s Group Center  
Entity Address, Address Line Two 29th Floor  
Entity Address, Address Line Three 200 Gloucester Road  
Entity Address, City or Town Wan Chai  
Entity Address, Country HK  
City Area Code +1  
Local Phone Number 702 287 9776  
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  
Entity Address, Postal Zip Code 000000  
Units    
Document Information [Line Items]    
Title of 12(b) Security Units  
Trading Symbol ASPCU  
Security Exchange Name NASDAQ  
Class A ordinary shares, no par value    
Document Information [Line Items]    
Title of 12(b) Security Class A ordinary shares, no par value  
Trading Symbol ASPC  
Security Exchange Name NASDAQ  
Rights    
Document Information [Line Items]    
Title of 12(b) Security Rights  
Trading Symbol ASPCR  
Security Exchange Name NASDAQ  
Class A Ordinary Shares    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   2,337,481
Class B Ordinary Shares    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   100