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v3.25.2

Other Current Assets (Details) | 12 Months Ended
--- | ---
Jun. 30, 2025
Other Current Assets [Abstract] |
Term deposit | 150 days
Maturity Date | Oct. 17, 2025

X
- Definition Maturity date. + References No definition available. + Details
Name: | athe_MaturityDate
Namespace Prefix: | athe_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Term deposit. + References No definition available. + Details
Name: | athe_TermDeposit
Namespace Prefix: | athe_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | ifrs-full_CurrentAssetsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration