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Financial instruments - Summary of foreign currency risk (Detail) - Foreign currency risk [member] - AUD ($)
$ in Thousands
Jun. 30, 2019
Jun. 30, 2018
Disclosure of detailed information about financial instruments [line items]    
Assets $ 31 $ 317
Liabilities 1,047 896
US dollars [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets 31 317
Liabilities 1,046 $ 896
Euros [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities $ 1