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Key Management Personnel - Additional Information (Detail) - USD ($)
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Key management personnel [member]      
Disclosure of transactions between related parties [line items]      
Purchases $ 0 $ 0 $ 0
Amounts payable 0 0 0
Key management personnel [member] | Loans [member]      
Disclosure of transactions between related parties [line items]      
Amounts payable 0 0 0
Amounts receivable 0 0 0
Director related entities [member]      
Disclosure of transactions between related parties [line items]      
Purchases 0 0 0
Amounts payable $ 0 $ 0 $ 0