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Income tax benefit - Summary of Income tax benefit (Parenthetical) (Detail)	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Disclosure Of Income Tax Benefit [Line Items]
Statutory tax rate	27.50%	27.50%	30.00%
US [member]
Disclosure Of Income Tax Benefit [Line Items]
Statutory tax rate	21.00%	21.00%	21.00%

X

- Definition

The applicable income tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2017-01-01
-Paragraph 81
-Subparagraph c
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_c_ii&doctype=Standard
-URIDate 2017-03-09

+ Details

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X

- Definition

Disclosure of income tax benefit [Line Items]

+ References

No definition available.

+ Details

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Namespace Prefix:	kzia_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: