v3.26.1
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2026
Jul. 21, 2026
Document and Entity Information    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Securities Act File Number 001-42377  
Entity Registrant Name ALDEL FINANCIAL II INC.  
Entity Incorporation, State or Country Code E9  
Entity Tax Identification Number 98-1800702  
Entity Address, Address Line One 104 S. Walnut Street  
Entity Address, Address Line Two Unit 1A  
Entity Address, City or Town Itasca  
Entity Address, State or Province IL  
Entity Address, Postal Zip Code 60143  
City Area Code 847  
Local Phone Number 791-6817  
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  
Entity Central Index Key 0002031561  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Class A ordinary shares    
Document and Entity Information    
Entity Common Stock, Shares Outstanding   23,707,500
Class B ordinary shares    
Document and Entity Information    
Entity Common Stock, Shares Outstanding   6,160,714
Units    
Document and Entity Information    
Title of 12(b) Security Units  
Trading Symbol ALDF.U  
Security Exchange Name NASDAQ  
Ordinary Share    
Document and Entity Information    
Title of 12(b) Security Class A Ordinary Share  
Trading Symbol ALDF  
Security Exchange Name NASDAQ  
Warrants    
Document and Entity Information    
Title of 12(b) Security Warrants  
Trading Symbol ALDF.W  
Security Exchange Name NASDAQ