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Non-current liabilities - Contingent consideration - Summary of Outcomes of Contingent Consideration (Detail)
 12 Months Ended
Jun. 30, 2020
AUD ($)
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