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Revenue - Additional Information (Detail) - Licensing Agreement [Member] $ in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |
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Mar. 31, 2024 USD ($) | Mar. 31, 2021 USD ($) | Jun. 30, 2024 AUD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2024 USD ($)
Oasmia [Member] |  |  |  |  |
Statement [line items] |  |  |  |  |
Upfront payment received |  |  |  | $ 4.0 |
Simcere Pharmaceutical Group Limited [Member] |  |  |  |  |
Statement [line items] |  |  |  |  |
Upfront payment received |  | $ 11.0 |  |  |
Upfront payment received in cash |  | 7.0 |  |  |
Upfront payment received in shares |  | $ 4.0 |  |  |
Premium on investment percentage |  | 20.00% |  |  |
Oasmia And Simcere Pharmaceutical Group [Member] |  |  |  |  |
Statement [line items] |  |  |  |  |
Revenue recognized of consideration received from customers during the period |  |  | $ 2.3 |  |
Sovargen Co Ltd [Member] |  |  |  |  |
Statement [line items] |  |  |  |  |
Upfront payment received | $ 1.5 |  |  |  |
Commercial Milestone [Member] | Oasmia [Member] |  |  |  |  |
Statement [line items] |  |  |  |  |
Contingent milestone payment receivable |  |  |  | $ 42.0 |
Commercial Milestone [Member] | Simcere Pharmaceutical Group Limited [Member] |  |  |  |  |
Statement [line items] |  |  |  |  |
Contingent milestone payment receivable |  | $ 281.0 |  |  |
Commercial Milestone [Member] | Sovargen Co Ltd [Member] |  |  |  |  |
Statement [line items] |  |  |  |  |
Contingent milestone payment receivable |  |  |  |  | $ 19.0

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- Definition Contingent milestone payment receivable. + References No definition available. + Details
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Namespace Prefix: | kzia_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Premium on investment percentage. + References No definition available. + Details
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Namespace Prefix: | kzia_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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- Definition Revenue recognized of consideration received from customers during the period. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | kzia_
Data Type: | xbrli:stringItemType
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- Definition Upfront payment received. + References No definition available. + Details
Name: | kzia_UpfrontPaymentReceived
Namespace Prefix: | kzia_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Upfront payment received in cash. + References No definition available. + Details
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Namespace Prefix: | kzia_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Upfront payment received in shares. + References No definition available. + Details
Name: | kzia_UpfrontPaymentReceivedInShares
Namespace Prefix: | kzia_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | kzia_AgreementAxis=kzia_LicensingAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CounterpartyNameAxis=kzia_SimcerePharmaceuticalGroupLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CounterpartyNameAxis=kzia_OasmiaAndSimcerePharmaceuticalGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CounterpartyNameAxis=kzia_SovargenCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |