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Share-based payments - Long-Term Incentive Plan Restricted Stock Units (Details) | 12 Months Ended
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Jun. 30, 2024 shares tranche | Jun. 30, 2023 shares tranche $ / shares
Share-based payments [Abstract] |  |
Number of tranches | tranche | 3 |
2022 Long-Term Incentive Plan Restricted Stock Units ("2022 LTIP") |  |
Share-based payments [Abstract] |  |
Number of tranches | tranche | 2 |
Vesting period |  | 3 years 3 months
Percentage of grants vested |  | 50.00%
Percentage of remaining grants vested |  | 50.00%
Remaining vesting period |  | 4 years 3 months
Percentage of vesting based on continued service |  | 80.00%
Percentage of vesting based on total shareholder return |  | 20.00%
Number of RSUs granted (in shares) | 0 |
Volume weighted average market price (in dollars per share) | $ / shares |  | $ 28
Number of trading days |  | 10 days
Number of consecutive trading days |  | 15 days
2022 Long-Term Incentive Plan Restricted Stock Units ("2022 LTIP") | Tranche One |  |
Share-based payments [Abstract] |  |
Vesting period | 3 years |
2022 Long-Term Incentive Plan Restricted Stock Units ("2022 LTIP") | Tranche Two |  |
Share-based payments [Abstract] |  |
Vesting period | 4 years |
2023 Long-Term Incentive Plan Restricted Stock Units ("2023 LTIP") |  |
Share-based payments [Abstract] |  |
Number of tranches | tranche | 3 |
2023 Long-Term Incentive Plan Restricted Stock Units ("2023 LTIP") | Tranche One | Time Based Vesting Conditions |  |
Share-based payments [Abstract] |  |
Vesting period | 1 year |
Number of RSUs issued (in shares) | 809,883 |
2023 Long-Term Incentive Plan Restricted Stock Units ("2023 LTIP") | Tranche Two | Time Based Vesting Conditions |  |
Share-based payments [Abstract] |  |
Vesting period | 2 years |
Number of RSUs issued (in shares) | 809,883 |
2023 Long-Term Incentive Plan Restricted Stock Units ("2023 LTIP") | Tranche One And Two | Time Based Vesting Conditions |  |
Share-based payments [Abstract] |  |
Number of tranches | tranche | 2 |
2023 Long-Term Incentive Plan Restricted Stock Units ("2023 LTIP") | Tranche Three | Performance Based Vesting Conditions |  |
Share-based payments [Abstract] |  |
Vesting period | 3 years |
Number of RSUs issued (in shares) | 1,574,725 |
Daniel Roberts | 2022 Long-Term Incentive Plan Restricted Stock Units ("2022 LTIP") |  |
Share-based payments [Abstract] |  |
Number of tranches | tranche |  | 3
Number of RSUs granted (in shares) |  | 305,630
Number of RSUs vested (in shares) |  | 713,166
William Roberts | 2022 Long-Term Incentive Plan Restricted Stock Units ("2022 LTIP") |  |
Share-based payments [Abstract] |  |
Number of tranches | tranche |  | 3
Number of RSUs granted (in shares) |  | 305,630
Number of RSUs vested (in shares) |  | 713,166
Non-Executive Director | 2022 Long-Term Incentive Plan Restricted Stock Units ("2022 LTIP") |  |
Share-based payments [Abstract] |  |
Vesting period |  | 10 days
Number of RSUs vested (in shares) |  | 108,559
Non-Executive Director | 2023 Long-Term Incentive Plan Restricted Stock Units ("2023 LTIP") |  |
Share-based payments [Abstract] |  |
Vesting period | 10 days |
Number of RSUs vested (in shares) | 120,303 |
Key Management Personnel | 2022 Long-Term Incentive Plan Restricted Stock Units ("2022 LTIP") |  |
Share-based payments [Abstract] |  |
Number of RSUs issued (in shares) |  | 1,594,215
Key Management Personnel | 2023 Long-Term Incentive Plan Restricted Stock Units ("2023 LTIP") |  |
Share-based payments [Abstract] |  |
Number of RSUs issued (in shares) | 3,194,491 |

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