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Income tax benefit - Summary of Income tax benefit (Parenthetical) (Detail)
12 Months Ended
Jun. 30, 2019
Disclosure Of Income Tax Benefit [line items]  
Statutory tax rate 27.50%
Australia [member]  
Disclosure Of Income Tax Benefit [line items]  
Statutory tax rate 27.50%
US [member]  
Disclosure Of Income Tax Benefit [line items]  
Statutory tax rate 21.00%