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Employees - Summary of Employees (Detail) - Employees
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Disclosure of average number of employees [line items]      
Average number of employees 28,926 27,161 26,146
Continuing operation [member]      
Disclosure of average number of employees [line items]      
Average number of employees 28,926 26,510 25,432
Continuing operation [member] | Australia [member]      
Disclosure of average number of employees [line items]      
Average number of employees 18,146 16,504 15,906
Continuing operation [member] | South America [member]      
Disclosure of average number of employees [line items]      
Average number of employees 6,979 6,729 6,361
Continuing operation [member] | North America [member]      
Disclosure of average number of employees [line items]      
Average number of employees 1,999 1,839 2,072
Continuing operation [member] | Asia [member]      
Disclosure of average number of employees [line items]      
Average number of employees 1,743 1,368 1,019
Continuing operation [member] | Europe [member]      
Disclosure of average number of employees [line items]      
Average number of employees 59 70 74
Discontinued operations [member]      
Disclosure of average number of employees [line items]      
Average number of employees   651 714