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Auditor's Remuneration - Summary of Auditors' Remuneration (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Auditors remuneration [line items]      
Total assurance services $ 16,276 $ 14,515 $ 23,850
Other services 400 13  
Total other services 400 13  
Total fees 16,676 14,528 23,850
Parent [member]      
Auditors remuneration [line items]      
Total assurance services 11,196 6,764 6,585
Subsidiaries, joint ventures and associates [member]      
Auditors remuneration [line items]      
Total assurance services 1,262 5,127 5,369
Audit-related assurance services required by legislation to be provided by the auditor [Member]      
Auditors remuneration [line items]      
Total assurance services 1,815 1,358 1,363
Other assurance and agreed-upon procedures under legislation or contractual arrangements [Member]      
Auditors remuneration [line items]      
Total assurance services $ 2,003 $ 1,266 $ 10,533