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Interest and Other Income from Continuing Operations (Details) - USD ($)	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Interest and Other Income from Continuing Operations [Abstract]
Refundable tax offset rate	43.50%
Annual aggregate turnover	$ 20,000,000
Other income	5,438,918	$ 4,019,285	$ 3,914,230
Miscellaneous income, dispute with catalent	1,975,056
Miscellaneous income, settlement of an insurance claim	$ 227,542

X

- Definition

Represents the amount of expenditure eligible for offset under the tax incentive scheme.

+ References

No definition available.

+ Details

Name:	athe_EligibleAmountUnderTaxIncentiveScheme
Namespace Prefix:	athe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the amount of miscellaneous income, dispute with catalent.

+ References

No definition available.

+ Details

Name:	athe_MiscellaneousIncomeDisputeWithCatalent
Namespace Prefix:	athe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the amount of Miscellaneous income, settlement of an insurance claim.

+ References

No definition available.

+ Details

Name:	athe_MiscellaneousIncomeSettlementOfAnInsuranceClaim
Namespace Prefix:	athe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

When ALL data is continuing and no discontinued values are reported, the 'continuing operations' dimension tag need NOT be individually applied.

+ References

No definition available.

+ Details

Name:	athe_TurnoverRevenue
Namespace Prefix:	athe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	ifrs-full_ComprehensiveIncomeContinuingAndDiscontinuedOperationsAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from a change in tax rate. [Refer: Average effective tax rate; Applicable tax rate]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2024-01-01
-Paragraph 81
-Subparagraph c
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_c_ii&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_TaxRateEffectFromChangeInTaxRate
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:percentItemType
Balance Type:	na
Period Type:	duration