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Earnings per share - Additional Information (Detail) - shares | 12 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022
Unissued Shares Under Options [Member] |  |  |
Earnings per share [line items] |  |  |
Number of options that have been excluded from the calculations as they were antidilutive | 36,180,000 | 14,780,000 | 8,655,500

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- 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_EarningsPerShareLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of antidilutive share options excluded from calculation of earnings per share. + References No definition available. + Details
Name: | kzia_NumberOfAntidilutiveShareOptionsExcludedFromCalculationOfEarningsPerShare
Namespace Prefix: | kzia_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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