| Cover | Aug. 08, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Aug. 08, 2023 |
| Current Fiscal Year End Date | --09-30 |
| Entity File Number | 001-34887 |
| Entity Registrant Name | MULLEN AUTOMOTIVE INC. |
| Entity Central Index Key | 0001499961 |
| Entity Tax Identification Number | 86-3289406 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 1405 Pioneer Street |
| Entity Address, City or Town | Brea |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 92821 |
| City Area Code | 714 |
| Local Phone Number | 613-1900 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.001 |
| Trading Symbol | MULN |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
