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Financial risk management - Schedule of Deposits Held which Derive Interest Revenue Together with the Maximum and Minimum Interest Rates Being Earned (Details) - Interest Rate Risk $ in Thousands, $ in Thousands | 6 Months Ended | 12 Months Ended
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Dec. 31, 2023 USD ($) | Dec. 31, 2023 AUD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2023 AUD ($)
USD |  |  |  |
Disclosure of Financial Risk Management [Line Items] |  |  |  |
Funds invested | $ 49,950 |  | $ 40,569 |
Rate increase on funds invested | 92 |  | 73 |
Rate decrease on funds invested | $ (92) |  | $ (73) |
USD | Bottom of Range |  |  |  |
Disclosure of Financial Risk Management [Line Items] |  |  |  |
Funds invested percentage | 1.84% | 1.84% | 1.79% | 1.79%
Rate increase | 2.02% | 2.02% | 1.97% | 1.97%
Rate decrease | 1.66% | 1.66% | 1.61% | 1.61%
USD | Top of Range |  |  |  |
Disclosure of Financial Risk Management [Line Items] |  |  |  |
Funds invested percentage | 1.84% | 1.84% | 1.79% | 1.79%
Rate increase | 2.02% | 2.02% | 1.97% | 1.97%
Rate decrease | 1.66% | 1.66% | 1.61% | 1.61%
AUD |  |  |  |
Disclosure of Financial Risk Management [Line Items] |  |  |  |
Funds invested |  | $ 35,466 |  | $ 35,707
Rate increase on funds invested |  | 151 |  | 143
Rate decrease on funds invested |  | $ (151) |  | $ (143)
AUD | Bottom of Range |  |  |  |
Disclosure of Financial Risk Management [Line Items] |  |  |  |
Funds invested percentage | 3.85% | 3.85% | 3.60% | 3.60%
Rate increase | 4.24% | 4.24% | 3.96% | 3.96%
Rate decrease | 3.47% | 3.47% | 3.24% | 3.24%
AUD | Top of Range |  |  |  |
Disclosure of Financial Risk Management [Line Items] |  |  |  |
Funds invested percentage | 4.88% | 4.88% | 4.59% | 4.59%
Rate increase | 5.37% | 5.37% | 5.05% | 5.05%
Rate decrease | 4.39% | 4.39% | 4.13% | 4.13%

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