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Employees - Summary of Employees (Detail) - Employees
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of average number of employees [line items]      
Average number of employees 34,478 31,589 28,926
Australia [member]      
Disclosure of average number of employees [line items]      
Average number of employees 23,828 20,967 18,146
South America [member]      
Disclosure of average number of employees [line items]      
Average number of employees 7,390 7,330 6,979
North America [member]      
Disclosure of average number of employees [line items]      
Average number of employees 1,299 1,296 1,999
Asia [member]      
Disclosure of average number of employees [line items]      
Average number of employees 1,907 1,939 1,743
Europe [member]      
Disclosure of average number of employees [line items]      
Average number of employees 54 57 59