| Cover | Sep. 01, 2024 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Sep. 01, 2024 |
| Entity File Number | 001-40367 |
| Entity Registrant Name | BARINTHUS BIOTHERAPEUTICS PLC |
| Entity Central Index Key | 0001828185 |
| Entity Tax Identification Number | 00-0000000 |
| Entity Incorporation, State or Country Code | X0 |
| Entity Address, Address Line One | Barinthus Biotherapeutics plc |
| Entity Address, Address Line Two | Unit 6-10 |
| Entity Address, Address Line Three | Zeus Building Rutherford Avenue, |
| Entity Address, City or Town | Harwell, Didcot |
| Entity Address, Country | GB |
| Entity Address, Postal Zip Code | OX11 0DF |
| City Area Code | +44 (0) |
| Local Phone Number | 1865 818 808 |
| 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 |
| American Depositary Shares[Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | American Depositary Shares |
| Trading Symbol | BRNS |
| Security Exchange Name | NASDAQ |
| Common Stock [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Ordinary shares, nominal value £0.000025 per share* |
