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Equity - Other contributed equity - Additional Information (Detail) - shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Oct. 31, 2016 | Sep. 10, 2016
Statement of changes in equity [abstract] |  |  |  |
Number of ordinary shares issued | 138,755,376 | 132,012,209 |  | 20,000,000
Number of ordinary shares available for conversion |  |  | 16,000,000 |
Number of convertible note may be converted into ordinary shares | 1,855,357 |  |  |

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- Definition The number of shares issued by the entity, for which full payment has been received. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 79 -Subparagraph a -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_79_a_ii&doctype=Standard -URIDate 2021-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition convertible note represents ordinary shares. + References No definition available. + Details
Name: | kzia_ConvertibleNoteRepresentsOrdinaryShares
Namespace Prefix: | kzia_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of ordinary shares available for conversion. + References No definition available. + Details
Name: | kzia_NumberOfOrdinarySharesAvailableForConversion
Namespace Prefix: | kzia_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant