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Fair value measurement - Additional Information (Detail)	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Disclosure of fair value measurement of assets [line items]
Milestone payment discount rate	15.00%	35.00%
Bottom of range [member]
Disclosure of fair value measurement of assets [line items]
Milestone payment discount rate	35.00%
Top of range [member]
Disclosure of fair value measurement of assets [line items]
Milestone payment discount rate	55.00%

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain 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
Balance Type:	na
Period Type:	duration

X

- Definition

Milestone payment discount rate.

+ References

No definition available.

+ Details

Name:	kzia_MilestonePaymentDiscountRate
Namespace Prefix:	kzia_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: