| Document And Entity Information | Nov. 01, 2024 |
| Document Information [Line Items] | |
| Entity, Registrant Name | Cactus Acquisition Corp. 1 Ltd. |
| Document, Type | 8-K |
| Document, Period End Date | Nov. 01, 2024 |
| Entity, Incorporation, State or Country Code | E9 |
| Entity, File Number | 001-40981 |
| Entity, Address, Address Line One | 4B Cedar Brook Drive |
| Entity, Address, City or Town | Cranbury |
| Entity, Address, State or Province | NJ |
| Entity, Address, Postal Zip Code | 08512 |
| City Area Code | 919 |
| Local Phone Number | 699 9827 |
| Written Communications | true |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity, Emerging Growth Company | true |
| Entity, Ex Transition Period | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0001865861 |
