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Earnings per share - Additional Information (Detail) - shares	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Unissued Shares Under Options [Member]
Earnings per share [line items]
Number of options that have been excluded from the calculations as they were antidilutive	50,813,500	36,180,000	14,780,000

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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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
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Period Type:	duration

X

- 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_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

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