| Cover | Mar. 21, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Mar. 21, 2024 |
| Entity Registrant Name | Autolus Therapeutics plc |
| Entity Incorporation, State or Country Code | X0 |
| Entity File Number | 001-38547 |
| Entity Address, Address Line One | The Mediaworks |
| Entity Address, Address Line Two | 191 Wood Lane |
| Entity Address, City or Town | London |
| Entity Address, Postal Zip Code | W12 7FP |
| Entity Address, Country | GB |
| City Area Code | (44) 20 |
| Local Phone Number | 3829 6230 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Central Index Key | 0001730463 |
| Amendment Flag | false |
| Common Class A | |
| Cover [Abstract] | |
| Title of 12(b) Security | Ordinary shares, nominal value $0.000042 per share* |
| Trading Symbol | * |
| Security Exchange Name | NASDAQ |
| Entity Listings [Line Items] | |
| Title of 12(b) Security | Ordinary shares, nominal value $0.000042 per share* |
| Trading Symbol | * |
| Security Exchange Name | NASDAQ |
| 8880 American Depositary Receipts | |
| Cover [Abstract] | |
| Title of 12(b) Security | American Depositary Shares, each representing one ordinary share, nominal value $0.000042 per share |
| Trading Symbol | AUTL |
| Security Exchange Name | NASDAQ |
| Entity Listings [Line Items] | |
| Title of 12(b) Security | American Depositary Shares, each representing one ordinary share, nominal value $0.000042 per share |
| Trading Symbol | AUTL |
| Security Exchange Name | NASDAQ |
