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Mineral Rights and Properties, Net - Summary of Mineral Rights and Properties, Net (Parenthetical) (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023
Asset Retirement Cost [Member]
Mineral Properties Net [Line Items]
Asset retirement cost, accumulated amortization	$ 28	$ 23

X

- Definition

Mineral properties, accumulated amortization.

+ References

No definition available.

+ Details

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Namespace Prefix:	feam_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Mineral properties net.

+ References

No definition available.

+ Details

Name:	feam_MineralPropertiesNetLineItems
Namespace Prefix:	feam_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	feam_MineralRightsAndPropertiesAxis=feam_AssetRetirementCostMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: