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Financial instruments - Summary of foreign currency risk sensitivity (Detail) - Foreign currency risk [member] - AUD ($)
$ in Thousands
Jun. 30, 2023
Jun. 30, 2022
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 $ (223) $ (400)
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 (494) (420)
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 271 20
Effect of increase in market risk on equity [member]    
Disclosure of detailed information about financial instruments [line items]    
Effect on profit before tax/equity (223) (400)
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 (494) (420)
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 $ 271 $ 20
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 $ 223 $ 400
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 494 420
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 (271) (20)
Effect of decrease in market risk on equity [member]    
Disclosure of detailed information about financial instruments [line items]    
Effect on profit before tax/equity 223 400
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 494 420
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 $ (271) $ (20)