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Financial instruments - Summary of foreign currency risk (Detail) - Foreign currency risk [member] - AUD ($)
$ in Thousands
Jun. 30, 2020
Jun. 30, 2019
Disclosure of detailed information about financial instruments [line items]    
Assets $ 272 $ 31
Liabilities 2,196 1,047
US dollars [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets 272 31
Liabilities $ 2,196 1,046
Euros [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities   $ 1