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Financial instruments - Summary of foreign currency risk sensitivity (Detail) - Foreign currency risk [member] - AUD ($)
$ in Thousands
Jun. 30, 2022
Jun. 30, 2021
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% 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 $ (400) $ (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 (420) (1,762)
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 20 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 (400) (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 (420) (1,762)
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 $ 20 $ 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%) (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 $ 400 $ 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 420 1,762
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 (20) (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 400 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 420 1,762
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 $ (20) $ (1)