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Business combinations - Summary of range of outcomes of contingent consideration (Detail)
$ in Thousands
Jun. 30, 2018
AUD ($)
Bottom of range [member]  
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]  
Contingent consideration $ 10,294
Top of range [member]  
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]  
Contingent consideration 11,798
Milestone 1 [member] | Bottom of range [member]  
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]  
Contingent consideration 1,250
Milestone 1 [member] | Top of range [member]  
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]  
Contingent consideration 1,250
Milestone 2 [member] | Bottom of range [member]  
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]  
Contingent consideration 1,250
Milestone 2 [member] | Top of range [member]  
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]  
Contingent consideration 1,250
Milestone 3 [member] | Bottom of range [member]  
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]  
Contingent consideration 3,000
Milestone 3 [member] | Top of range [member]  
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]  
Contingent consideration 3,705
Milestone 4 [member] | Bottom of range [member]  
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]  
Contingent consideration 3,400
Milestone 4 [member] | Top of range [member]  
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]  
Contingent consideration 4,199
Milestone 5 [member] | Bottom of range [member]  
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]  
Contingent consideration 1,394
Milestone 5 [member] | Top of range [member]  
Disclosure of transactions recognised separately from acquisition of assets and assumption of liabilities in business combination [line items]  
Contingent consideration $ 1,394