v3.26.1
Document And Entity Information - shares
 3 Months Ended
Mar. 31, 2026
May 11, 2026
Document Information Line Items    
Entity Central Index Key 0001876716  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2026  
Document Fiscal Year Focus 2026  
Document Transition Report false  
Entity Registrant Name ASPAC II Acquisition Corp.  
Entity Incorporation, State or Country Code D8  
Entity File Number 001-41372  
Entity Tax Identification Number 00-0000000  
Entity Address, Address Line One 289 Beach Road  
Entity Address, Address Line Two #03-01  
Entity Address, City or Town Singapore  
Entity Address, Country SG  
Entity Address, Postal Zip Code 199552  
City Area Code (65)  
Local Phone Number 6818 5796  
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 Q1  
Current Fiscal Year End Date --12-31  
Units, each consisting of one Class A ordinary share, with no par value, one-half of one redeemable warrant and one right to receive one-tenth of one Class A ordinary share    
Document Information Line Items    
Title of 12(g) Security Units, each consisting of one Class A ordinary share, with no par value, one-half of one redeemable warrant  
Trading Symbol ASUUF  
Class A ordinary shares, no par value, included as part of the units    
Document Information Line Items    
Title of 12(g) Security Class A ordinary shares, no par value, included as part of the units  
Trading Symbol ASCBF  
Redeemable warrants, each whole warrant exercisable for one Class A ordinary share, included as part of the units    
Document Information Line Items    
Title of 12(g) Security Redeemable warrants, each whole warrant exercisable for one Class A ordinary share, included as part of the units  
Trading Symbol ASCWF  
Rights, each Right to receive one-tenth (1/10) of one Class A ordinary share included as part of the units    
Document Information Line Items    
Title of 12(g) Security Rights, each Right to receive one-tenth (1/10) of one Class A ordinary share included as part of the units  
Trading Symbol ASCRF  
Class A Ordinary Shares    
Document Information Line Items    
Entity Common Stock, Shares Outstanding   5,243,594
Class B Ordinary Shares    
Document Information Line Items    
Entity Common Stock, Shares Outstanding   100,000