XML 109 R95.htm IDEA: XBRL DOCUMENT
v3.25.2

Financial Instruments - Schedule of Financial Assets and Liabilities Subject to Foreign Currency Risk (Details) - AUD ($) | Jun. 30, 2025 | Jun. 30, 2024
--- | --- | ---
Schedule of Financial Assets and Liabilities [Line Items] |  |
Total exposure | $ 1,050,099 | $ (288,924)
Cash and Cash Equivalent [Member] | USD [Member] |  |
Schedule of Financial Assets and Liabilities [Line Items] |  |
Total exposure | 1,544,448 | 225,722
Trade and Other Payables [Member] | USD [Member] |  |
Schedule of Financial Assets and Liabilities [Line Items] |  |
Total exposure | (495,145) | (507,820)
Trade and Other Payables [Member] | £GBP [Member] |  |
Schedule of Financial Assets and Liabilities [Line Items] |  |
Total exposure | 796 | (3,834)
Trade and Other Payables [Member] | JPY [Member] |  |
Schedule of Financial Assets and Liabilities [Line Items] |  |
Total exposure |  | $ (2,992)

X
- Definition The financial instruments total exposure. + References No definition available. + Details
Name: | athe_FinancialInstrumentsTotalExposure
Namespace Prefix: | athe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfFinancialAssetsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=athe_CashAndCashEquivalentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_USD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=athe_TradeAndOtherPayablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_GBP
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_JPY
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |