| Cover | Jul. 24, 2023 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jul. 24, 2023 |
| Current Fiscal Year End Date | --12-31 |
| Entity File Number | 001-40266 |
| Entity Registrant Name | Magnum Opus Acquisition Limited |
| Entity Central Index Key | 0001843121 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Incorporation, State or Country Code | E9 |
| Entity Address, Address Line One | Unit 1009 |
| Entity Address, Address Line Two | ICBC Tower |
| Entity Address, Address Line Three | Three Garden Road |
| Entity Address, City or Town | Central |
| Entity Address, Country | HK |
| City Area Code | 852 |
| Local Phone Number | 3757 9857 |
| 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 |
| Class A ordinary shares, par value $0.0001 per share | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Class A ordinary shares, par value $0.0001 per share |
| Trading Symbol | OPA |
| Security Exchange Name | NYSE |
| Redeemable warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 | |
| 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 | OPA WS |
| Security Exchange Name | NYSE |
| Units, each consisting of one Class A ordinary share and one-half of one redeemable warrant | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Units, each consisting of one Class A ordinary share and one-half of one redeemable warrant |
| Trading Symbol | OPA.U |
| Security Exchange Name | NYSE |
