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Auditor's Remuneration - Additional Information (Detail) - USD ($)
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Auditors remuneration [line items]      
Fees payable in respect of the audit of pension funds $ 16,276,000 $ 14,515,000 $ 23,850,000
Tax compliance and advisory services 400,000 13,000  
Tax compliance services [member]      
Auditors remuneration [line items]      
Tax compliance and advisory services 269,000 13,000 0
Pension funds [member]      
Auditors remuneration [line items]      
Fees payable in respect of the audit of pension funds 0 0 0
Tax Advisory Services [Member]      
Auditors remuneration [line items]      
Tax compliance and advisory services $ 131,000 $ 0 $ 0