v3.26.1
Cover - shares
 6 Months Ended
Jun. 30, 2026
Aug. 13, 2026
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Amendment Flag false  
Document Period End Date Jun. 30, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Entity Information [Line Items]    
Entity Registrant Name Melar Acquisition Corp. I/Cayman  
Entity Central Index Key 0002016221  
Entity File Number 001-42134  
Entity Tax Identification Number 87-1634103  
Entity Incorporation, State or Country Code E9  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Shell Company true  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Contact Personnel [Line Items]    
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  
Entity Address, Postal Zip Code 10023  
Entity Phone Fax Numbers [Line Items]    
City Area Code (702)  
Local Phone Number 781-1120  
Units, each consisting of one Class A Ordinary Share and one-half of one redeemable Warrant    
Entity Listings [Line Items]    
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, par value $0.0001 per share    
Entity Listings [Line Items]    
Title of 12(b) Security Class A Ordinary Shares, par value $0.0001 per share  
Trading Symbol MACI  
Security Exchange Name NASDAQ  
Warrants, each whole Warrant exercisable for one Class A Ordinary Share at an exercise price of $11.50 per share    
Entity Listings [Line Items]    
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 A Ordinary Shares    
Entity Listings [Line Items]    
Entity Common Stock, Shares Outstanding   9,545,544
Class B Ordinary Share    
Entity Listings [Line Items]    
Entity Common Stock, Shares Outstanding   1