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Financial instruments - Summary of variable interest rate balances (Detail) - AUD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Disclosure of financial instruments by type of interest rate [line items]    
Cash at bank and in hand $ 1,264 $ 834
Short term deposits 7,500 4,600
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 1,264 834
Short term deposits 7,500 4,600
Net exposure to cash flow interest rate risk $ 8,764 $ 5,434
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 0.04% 0.03%
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 0.95% 1.88%