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Income tax benefit/expense - Summary of Income tax benefit (Parenthetical) (Detail)
12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure Of Income Tax Benefit [line items]      
Statutory tax rate 25.00% 25.00% 26.00%
Australia [member]      
Disclosure Of Income Tax Benefit [line items]      
Statutory tax rate 25.00% 25.00% 26.00%
US [member]      
Disclosure Of Income Tax Benefit [line items]      
Statutory tax rate 21.00% 21.00% 21.00%