| Document and Entity Information | Feb. 08, 2024 |
| Cover [Abstract] | |
| Entity Tax Identification Number | 00-0000000 |
| Amendment Flag | false |
| Entity Central Index Key | 0001730463 |
| Document Type | 8-K |
| Document Period End Date | Feb. 08, 2024 |
| Entity Registrant Name | Autolus Therapeutics plc |
| Entity Incorporation State 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 |
| Security 12b Title | American Depositary Shares, each representing one ordinary share, par value $0.000042 per share |
| Trading Symbol | AUTL |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
