v3.25.1
Cover Page
 12 Months Ended
Dec. 31, 2024
Document Information [Line Items]  
Document Type S-4/A
Amendment Flag true
Amendment Description Amendment No. 4
Entity Registrant Name CSLM Holdings, Inc.
Entity Central Index Key 0002033383
Entity Tax Identification Number 98-1602789
Entity Incorporation, State or Country Code DE
Entity Filer Category Non-accelerated Filer
Entity Small Business true
Entity Emerging Growth Company true
Entity Ex Transition Period false
Entity Address, Address Line One 2400 E. Commercial Boulevard
Entity Address, Address Line Two Suite 900
Entity Address, City or Town Fort Lauderdale
Entity Address, State or Province FL
Entity Address, Postal Zip Code 33308
City Area Code 954
Local Phone Number 315-9380
Entity Primary SIC Number 6770
Business Contact [Member]  
Document Information [Line Items]  
Entity Address, Address Line One 2400 E. Commercial Boulevard
Entity Address, Address Line Two Suite 900
Entity Address, City or Town Fort Lauderdale
Entity Address, State or Province FL
Entity Address, Postal Zip Code 33308
City Area Code 954
Local Phone Number 315-9381
Contact Personnel Name Charles Cassel