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Non-current liabilities - Contingent consideration - Summary of Outcomes of Contingent Consideration (Detail) - AUD ($) | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Top of range [member] |  |
Disclosure Of Other Non Current Liabilities [line items] |  |
Contingent consideration | $ 6,843,000 |
Bottom of range [member] |  |
Disclosure Of Other Non Current Liabilities [line items] |  |
Contingent consideration |  | $ 6,044,000
Milestone Two [member] | Top of range [member] |  |
Disclosure Of Other Non Current Liabilities [line items] |  |
Contingent consideration | 1,250,000 |
Milestone Two [member] | Bottom of range [member] |  |
Disclosure Of Other Non Current Liabilities [line items] |  |
Contingent consideration |  | 1,250,000
Milestone Four [member] | Top of range [member] |  |
Disclosure Of Other Non Current Liabilities [line items] |  |
Contingent consideration | 4,199,000 |
Milestone Four [member] | Bottom of range [member] |  |
Disclosure Of Other Non Current Liabilities [line items] |  |
Contingent consideration |  | 3,400,000
Milestone Five [member] | Top of range [member] |  |
Disclosure Of Other Non Current Liabilities [line items] |  |
Contingent consideration | $ 1,394,000 |
Milestone Five [member] | Bottom of range [member] |  |
Disclosure Of Other Non Current Liabilities [line items] |  |
Contingent consideration |  | $ 1,394,000

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