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Financial instruments - Summary of foreign currency risk sensitivity (Detail) - Foreign currency risk [member] - AUD ($)
$ in Thousands
Jun. 30, 2019
Jun. 30, 2018
US dollars [member]    
Disclosure of detailed information about financial instruments [line items]    
% change 10.00% 10.00%
Increase in market risk [member] | US dollars [member]    
Disclosure of detailed information about financial instruments [line items]    
% change 10.00% 10.00%
Effect of increase in market risk on profit (loss) before tax [member]    
Disclosure of detailed information about financial instruments [line items]    
Effect on profit before tax/equity $ 102  
Effect of increase in market risk on profit (loss) before tax [member] | US dollars [member]    
Disclosure of detailed information about financial instruments [line items]    
Effect on profit before tax/equity 102 $ 58
Effect of increase in market risk on equity [member]    
Disclosure of detailed information about financial instruments [line items]    
Effect on profit before tax/equity 102  
Effect of increase in market risk on equity [member] | US dollars [member]    
Disclosure of detailed information about financial instruments [line items]    
Effect on profit before tax/equity $ 102 $ 58
Decrease in market risk [member] | US dollars [member]    
Disclosure of detailed information about financial instruments [line items]    
% change 10.00% 10.00%
Effect of decrease in market risk on equity [member]    
Disclosure of detailed information about financial instruments [line items]    
Effect on profit before tax/equity $ 102  
Effect of decrease in market risk on equity [member] | US dollars [member]    
Disclosure of detailed information about financial instruments [line items]    
Effect on profit before tax/equity 102 $ 58
Effect of decrease in market risk on profit (loss) before tax [member]    
Disclosure of detailed information about financial instruments [line items]    
Effect on profit before tax/equity 102  
Effect of decrease in market risk on profit (loss) before tax [member] | US dollars [member]    
Disclosure of detailed information about financial instruments [line items]    
Effect on profit before tax/equity $ 102 $ 58