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Non-current assets - intangibles - Summary of reconciliations of intangibles (Detail) - AUD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of detailed information about intangible assets [line items]      
Beginning balance $ 15,918 $ 822  
Additions   8  
Disposals (3)    
Additions through business combinations   16,408  
Amortisation expense (1,336) (1,320) $ (570)
Ending balance 14,579 15,918 822
Software [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 5 2  
Additions   8  
Disposals (3)    
Amortisation expense (2) (5)  
Ending balance   5 2
Patents and intellectual property [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 250 820  
Amortisation expense (250) (570) (570)
Ending balance   250 $ 820
GDC licensing agreement [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 15,663    
Additions through business combinations   16,408  
Amortisation expense (1,084) (745)  
Ending balance $ 14,579 $ 15,663