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Related Party Transactions - Summary of Transactions with Related Parties (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Joint operations [member]    
Disclosure of transactions between related parties [line items]    
Sales of goods/services $ 0 $ 0
Interest income 1,532 1,764
Net loans made to/(repayments from) related parties 12,539 60,566
Joint ventures [member]    
Disclosure of transactions between related parties [line items]    
Sales of goods/services 0 0
Associates [member]    
Disclosure of transactions between related parties [line items]    
Sales of goods/services 0 0
Purchases of goods/services 1,141,230 1,358,016
Interest income 826 19,337
Interest expense 11  
Dividends received 509,577 693,105
Net loans made to/(repayments from) related parties $ 14,547 $ (599,979)