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Accounts Payable and Accrued Liabilities - Summary of Accounts Payable and Accrued Liabilities (Parenthetical) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023
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Payables and Accruals [Abstract] |  |
Capital expenditure included in trade accounts payable | $ 1,324 | $ 699

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- Definition Capital expenditure included in trade accounts payable + References No definition available. + Details
Name: | feam_CapitalExpenditureIncludedInTradeAccountsPayable
Namespace Prefix: | feam_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_PayablesAndAccrualsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration