v3.25.2
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2025
Aug. 13, 2025
Document Information    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 001-42134  
Entity Registrant Name Melar Acquisition Corp. I/Cayman  
Entity Incorporation, State or Country Code E9  
Entity Tax Identification Number 87-1634103  
Entity Address, Postal Zip Code 10023  
Entity Address, Address Line One 143 West 72nd Street  
Entity Address, Address Line Two 4th Floor  
Entity Address, City or Town New York  
Entity Address State Or Province NY  
City Area Code 702  
Local Phone Number 781-1120  
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 0002016221  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Units, each consisting of one Class A ordinary share and one-half of one redeemable warrant    
Document Information    
Title of 12(b) Security Units, each consisting of one Class A ordinary share and one-half of one redeemable warrant  
Trading Symbol MACIU  
Security Exchange Name NASDAQ  
Class A ordinary shares    
Document Information    
Title of 12(b) Security Class A ordinary shares, par value $0.0001 per share  
Trading Symbol MACI  
Security Exchange Name NASDAQ  
Entity Common Stock, Shares Outstanding   16,000,000
Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price    
Document Information    
Title of 12(b) Security Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share  
Trading Symbol MACIW  
Security Exchange Name NASDAQ  
Class B ordinary shares    
Document Information    
Entity Common Stock, Shares Outstanding   5,621,622