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Earnings per share - Additional Information (Detail)	6 Months Ended
	Dec. 31, 2022 shares
Unlisted options [member]
Earnings per share [line items]
Number of options that have been excluded from the calculations as they were antidilutive	8,640,000

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

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Data Type:	xbrli:stringItemType
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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

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Namespace Prefix:	kzia_
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Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=kzia_UnlistedOptionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: