| Document And Entity Information | Dec. 01, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Document Period End Date | Dec. 01, 2023 |
| Entity Registrant Name | 5E ADVANCED MATERIALS, INC. |
| Entity Central Index Key | 0001888654 |
| Entity Emerging Growth Company | true |
| Entity File Number | 001-41279 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 87-3426517 |
| Entity Address, Address Line One | 9329 Mariposa Road, Suite 210 |
| Entity Address, City or Town | Hesperia |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 92344 |
| City Area Code | (442) |
| Local Phone Number | 221-0225 |
| Written Communications | false |
| Soliciting Material | true |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Ex Transition Period | true |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | FEAM |
| Security Exchange Name | NASDAQ |
| Amendment Description | This Amendment No. 1 to the Current Report on Form 8-K amends Item 5.02 of the Current Report on Form 8-K filed on December 6, 2023 (the “Original Form 8-K”) solely to clarify the effective dates of Mr. Stefan Selig’s director appointment. The agreement provided as Exhibit 10.4 to the Original Form 8-K should be disregarded and is superseded in its entirety by Exhibit 10.1 to this Amendment No. 1 to Form 8-K. On December 11, 2023, the Company issued a press release, clarifying that Mr. Selig’s appointment to the Company’s Board of Directors (the “Board”) commenced effective as of December 11, 2023. Concurrent wtih Mr. Selig’s appointment to the Board, he tendered his resignation as a member of the Board effective June 11, 2024. No other changes have been made to the Original Form 8-K. |
