| Document and Entity Information | Dec. 07, 2022 |
| Document And Entity Information [Line Items] | |
| Entity Tax Identification Number | 00-0000000 |
| Amendment Flag | false |
| Entity Central Index Key | 0001837739 |
| Document Type | 8-K |
| Document Period End Date | Dec. 07, 2022 |
| Entity Registrant Name | COLONNADE ACQUISITION CORP. II |
| Entity Incorporation State Country Code | E9 |
| Entity File Number | 001-40184 |
| Entity Address, Address Line One | 1400 Centrepark Blvd. Ste. 810 |
| Entity Address, City or Town | West Palm Beach |
| Entity Address, State or Province | FL |
| Entity Address, Postal Zip Code | 33401 |
| City Area Code | (561) |
| Local Phone Number | 712-7860 |
| 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 |
| Units Each Consisting Of One Class A Ordinary Share And One Fifth Of One Redeemable Warrant [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Units, each consisting of one Class A ordinary share and one-fifth of one redeemable warrant |
| Trading Symbol | CLAA.U |
| Security Exchange Name | NYSE |
| Common Class A [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Class A ordinary shares, par value $0.0001 per share |
| Trading Symbol | CLAA |
| Security Exchange Name | NYSE |
| Redeemable Warrants Each Warrant Exercisable For One Class A Ordinary Share Each At An Exercise Price Of 11.50 Per Share [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Redeemable warrants, each warrant exercisable for one Class A ordinary share, each at an exercise price of $11.50 per share |
| Trading Symbol | CLAA WS |
| Security Exchange Name | NYSE |
