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Financial instruments - Summary of foreign currency risk sensitivity (Detail) - Foreign currency risk [member] - AUD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
US dollars [member]    
Disclosure of detailed information about financial instruments [line items]    
% change 10.00% 10.00%
Pound Sterling [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] | Pound Sterling [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   $ (470)
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 $ 58 (478)
Effect of increase in market risk on profit (loss) before tax [member] | Pound Sterling [member]    
Disclosure of detailed information about financial instruments [line items]    
Effect on profit before tax/equity   8
Effect of increase in market risk on equity [member]    
Disclosure of detailed information about financial instruments [line items]    
Effect on profit before tax/equity   (470)
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 $ 58 (478)
Effect of increase in market risk on equity [member] | Pound Sterling [member]    
Disclosure of detailed information about financial instruments [line items]    
Effect on profit before tax/equity   $ 8
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] | Pound Sterling [member]    
Disclosure of detailed information about financial instruments [line items]    
% change   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   $ 470
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 $ (58) 478
Effect of decrease in market risk on equity [member] | Pound Sterling [member]    
Disclosure of detailed information about financial instruments [line items]    
Effect on profit before tax/equity   (8)
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   470
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 $ (58) 478
Effect of decrease in market risk on profit (loss) before tax [member] | Pound Sterling [member]    
Disclosure of detailed information about financial instruments [line items]    
Effect on profit before tax/equity   $ (8)