| Document and Entity Information | Mar. 23, 2023 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Mar. 23, 2023 |
| Entity Registrant Name | COLONNADE ACQUISITION CORP. II |
| Entity Incorporation, State or Country Code | E9 |
| Entity File Number | 001-40184 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Address, Address Line One | 1400 Centrepark Blvd. |
| Entity Address, Address Line Two | 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 | 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 | 0001837739 |
| Units, each consisting of one Class A ordinary share, $0.0001 par value, and one-fifth of one redeemable warrant [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Units, each consisting of one Class A ordinary share, $0.0001 par value, and one-fifth of one redeemable warrant |
| Trading Symbol | CLAA.U |
| Security Exchange Name | NYSE |
| Class A ordinary shares subject to possible redemption [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Class A ordinary shares, par value $0.0001 per share |
| Trading Symbol | CLAA |
| Security Exchange Name | NYSE |
| Warrant [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | 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 |
