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Non-current assets - Financial assets - Summary of non-current assets - financial assets (Detail) - AUD ($)
$ in Thousands
Jun. 30, 2019
Jun. 30, 2018
Non-current financial assets at fair value through profit or loss [line items]    
Financial assets $ 168 $ 4,335
Listed ordinary shares [member] | Financial assets at fair value through profit or loss [member]    
Non-current financial assets at fair value through profit or loss [line items]    
Financial assets 25  
Listed ordinary shares [member] | Financial assets available-for-sale [member]    
Non-current financial assets at fair value through profit or loss [line items]    
Financial assets   3,680
Unlisted shares and options [member] | Financial assets at fair value through profit or loss [member]    
Non-current financial assets at fair value through profit or loss [line items]    
Financial assets $ 143 $ 655