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Employees - Summary of Employees (Detail) - Employees | 12 Months Ended
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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

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