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Earnings per share - Additional Information (Detail) - AUD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Oct. 31, 2016
Earnings per share [line items]      
Number of unlisted convertible notes 1,865,000   16,000,000
Face value of convertible notes $ 464 $ 600  
Unlisted options [member]      
Earnings per share [line items]      
Number of options that have been excluded from the calculations as they were antidilutive 4,798,266    
Listed options [member]      
Earnings per share [line items]      
Number of options that have been excluded from the calculations as they were antidilutive 3,148,400