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Related party transactions - Additional Information (Detail) - AUD ($)
Jun. 30, 2020
Jun. 30, 2019
Disclosure of transactions between related parties [line items]    
Trade receivables from related parties $ 0  
Trade payables to related parties 0  
Loan to related parties 0  
Loan from related parties 0  
Parent [member]    
Disclosure of transactions between related parties [line items]    
Contingent liabilities 0 $ 0
Capital commitments for property, plant and equipment $ 0 $ 0