| Document And Entity Information | Oct. 29, 2024 |
| Document Information [Line Items] | |
| Entity, Registrant Name | CACTUS ACQUISITION CORP. 1 LIMITED |
| Document, Type | 8-K |
| Document, Period End Date | Oct. 29, 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 | 609 |
| Local Phone Number | 495-2222 |
| 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 |
| Amendment Flag | false |
| Entity, Central Index Key | 0001865861 |
| UnitsEachConsistingOfOneClassAOrdinaryShareAndOnehalfRedeemableWarrant Custom [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Units, each consisting of one Class A ordinary share and one-half redeemable warrant |
| Trading Symbol | CCTSU |
| Security Exchange Name | NASDAQ |
| ClassAOrdinarySharesParValue00001PerShare Custom [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Class A ordinary shares, par value $0.0001 per share |
| Trading Symbol | CCTS |
| Security Exchange Name | NASDAQ |
| RedeemableWarrantsEachWarrantExercisableForOneClassAOrdinaryShareAtAnExercisePriceOf1150 Custom [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Redeemable warrants, each warrant exercisable for one Class A ordinary share at an exercise price of $11.50 |
| Trading Symbol | CCTSW |
| Security Exchange Name | NASDAQ |
