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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