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Employees - Summary of Employees (Detail) - Employees
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of average number of employees [Line Items]      
Average number of employees 27,161 26,146 26,827
Continuing operations [member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 26,510 25,432 25,974
Continuing operations [member] | Australia [member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 16,504 15,906 15,834
Continuing operations [member] | South America [member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 6,729 6,361 6,509
Continuing operations [member] | North America [member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 1,839 2,072 2,748
Continuing operations [member] | Asia 1 [member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 1,368 1,019 822
Continuing operations [member] | Europe [member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 70 74 61
Discontinued operations [member]      
Disclosure of average number of employees [Line Items]      
Average number of employees 651 714 853