| Document and Entity Information | Feb. 19, 2025 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 19, 2025 |
| Entity Registrant Name | CSLM Acquisition Corp. |
| Entity Incorporation State Country Code | E9 |
| Entity File Number | 001-41219 |
| Entity Tax Identification Number | 98-1602789 |
| Entity Address Address Line 1 | 2400 E. Commercial Boulevard |
| Entity Address Address Line 2 | Suite 900 |
| Entity Address City Or Town | Ft. Lauderdale |
| Entity Address State Or Province | FL |
| Entity Address Postal Zip Code | 33308 |
| City Area Code | 954 |
| Local Phone Number | 315-9381 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity Central Index Key | 0001875493 |
| Amendment Flag | false |
| Capital Units [Member] | |
| Document Information [Line Items] | |
| Security 12b Title | Units, each consisting of one Class A ordinary share, one right and one-half of one redeemable warrant |
| Trading Symbol | CSLFU |
| Security Exchange Name | NONE |
| Class A ordinary shares, par value $0.0001 per share [Member] | |
| Document Information [Line Items] | |
| Security 12b Title | Class A ordinary shares, par value $0.0001 per share |
| Trading Symbol | CSLMF |
| Security Exchange Name | NONE |
| Warrant [Member] | |
| Document Information [Line Items] | |
| Security 12b Title | Redeemable warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 |
| Trading Symbol | CSLWF |
| Security Exchange Name | NONE |
| Rights to acquire one-tenth of one Class A ordinary share [Member] | |
| Document Information [Line Items] | |
| Security 12b Title | Rights to acquire one-tenth of one Class A ordinary share |
| Trading Symbol | CSLRF |
| Security Exchange Name | NONE |
