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Financial instruments - Summary of variable interest rate balances (Detail) - AUD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Disclosure of financial instruments by type of interest rate [line items]    
Cash at bank and in hand $ 21,087 $ 1,264
Short term deposits 6,500 7,500
Interest rate risk [member] | Variable interest rate [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Cash at bank and in hand 21,087 1,264
Short term deposits 6,500 7,500
Net exposure to cash flow interest rate risk $ 27,587 $ 8,764
Interest rate risk [member] | Variable interest rate [member] | Weighted average [member] | Cash at bank and in hand [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest rate 0.00% 0.04%
Interest rate risk [member] | Variable interest rate [member] | Weighted average [member] | Short term deposits [member]    
Disclosure of financial instruments by type of interest rate [line items]    
Interest rate 0.04% 0.95%