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Current assets - trade and other receivables - Additional Information (Detail) | 12 Months Ended |
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Jun. 30, 2020 AUD ($) | Jun. 30, 2019 AUD ($) | Jun. 30, 2020 EUR (€)
Trade and other receivables [abstract] |  |  |
Guarantee included in deposits held | $ 409,098 |  | € 250,000
Recognised a loss in profit or loss in respect of impairment of receivables (excluding 'deposits held') | $ 0 | $ 16,767 |

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- Definition The amount of impairment loss recognised in profit or loss for trade receivables. [Refer: Impairment loss recognised in profit or loss; Trade receivables] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Guarantee deposits assets current. + References No definition available. + Details
Name: | kzia_GuaranteeDepositsAssetsCurrent
Namespace Prefix: | kzia_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant