Document and Entity Information - USD ($)	10 Months Ended
	Dec. 31, 2024	Mar. 20, 2025
Document Information
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2024
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 Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
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
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	true
Entity Public Float	$ 161,280,000
Entity Central Index Key	0002016221
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Amendment Flag	false
Transition Report	true
Auditor Name	WithumSmith+Brown, PC
Auditor Location	New York
Auditor Firm ID	100
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