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v3.25.2

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