| Cover | Dec. 31, 2024 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Dec. 31, 2024 |
| Entity File Number | 001-40514 |
| Entity Registrant Name | Coliseum Acquisition Corp. |
| Entity Central Index Key | 0001847440 |
| Entity Tax Identification Number | 98-1583230 |
| Entity Incorporation, State or Country Code | E9 |
| Entity Address, Address Line One | 1180 North Town Center Drive |
| Entity Address, Address Line Two | Suite 100 |
| Entity Address, City or Town | Las Vegas |
| Entity Address, State or Province | NV |
| Entity Address, Postal Zip Code | 89144 |
| City Area Code | 702 |
| Local Phone Number | 781-4313 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Units [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Units, each consisting of one Class A ordinary share, par value $0.001 per share, and one-third of one redeemable warrant |
| Trading Symbol | MITAU |
| Security Exchange Name | NASDAQ |
| Common Class A [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Class A ordinary shares, par value $0.001 per share |
| Trading Symbol | MITA |
| Security Exchange Name | NASDAQ |
| Redeemable Warrants [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Redeemable warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 |
| Trading Symbol | MITAW |
| Security Exchange Name | NASDAQ |
