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Employees - Summary of Employees (Detail) - Employees
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Disclosure of average number of employees [line items]      
Average number of employees 31,589 28,926 27,161
Continuing operation [member]      
Disclosure of average number of employees [line items]      
Average number of employees 31,589 28,926 26,510
Continuing operation [member] | Australia [member]      
Disclosure of average number of employees [line items]      
Average number of employees 20,967 18,146 16,504
Continuing operation [member] | South America [member]      
Disclosure of average number of employees [line items]      
Average number of employees 7,330 6,979 6,729
Continuing operation [member] | North America [member]      
Disclosure of average number of employees [line items]      
Average number of employees 1,296 1,999 1,839
Continuing operation [member] | Asia [member]      
Disclosure of average number of employees [line items]      
Average number of employees 1,939 1,743 1,368
Continuing operation [member] | Europe [member]      
Disclosure of average number of employees [line items]      
Average number of employees 57 59 70
Discontinued operations [member]      
Disclosure of average number of employees [line items]      
Average number of employees     651