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Financial instruments - Summary of foreign currency risk sensitivity (Detail) - Foreign currency risk [member] - AUD ($)
$ in Thousands
Jun. 30, 2021
Jun. 30, 2020
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%
Increase in market risk [member] | Euros [member]    
Disclosure of detailed information about financial instruments [line items]    
% change 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 $ (1,761)  
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 (1,762) $ 192
Effect of increase in market risk on profit (loss) before tax [member] | Euros [member]    
Disclosure of detailed information about financial instruments [line items]    
Effect on profit before tax/equity 1  
Effect of increase in market risk on equity [member]    
Disclosure of detailed information about financial instruments [line items]    
Effect on profit before tax/equity (1,761)  
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 (1,762) $ 192
Effect of increase in market risk on equity [member] | Euros [member]    
Disclosure of detailed information about financial instruments [line items]    
Effect on profit before tax/equity $ 1  
Decrease in market risk [member] | US dollars [member]    
Disclosure of detailed information about financial instruments [line items]    
% change (10.00%) (10.00%)
Decrease in market risk [member] | Euros [member]    
Disclosure of detailed information about financial instruments [line items]    
% change (10.00%)  
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 $ 1,761  
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 1,762 $ (192)
Effect of decrease in market risk on profit (loss) before tax [member] | Euros [member]    
Disclosure of detailed information about financial instruments [line items]    
Effect on profit before tax/equity (1)  
Effect of decrease in market risk on equity [member]    
Disclosure of detailed information about financial instruments [line items]    
Effect on profit before tax/equity 1,761  
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 1,762 $ (192)
Effect of decrease in market risk on equity [member] | Euros [member]    
Disclosure of detailed information about financial instruments [line items]    
Effect on profit before tax/equity $ (1)