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Share-based payments - Measuring Fair Value of Arrangements Granted (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Jun. 30, 2024 USD ($) shares $ / shares | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($)
Fair Value of Arrangements Granted |  |  |
Expense from share-based payment transactions | $ | $ 23,636 | $ 14,356 | $ 13,896
Long Term Incentive Plan Date 1 July 2022, Service RSUs |  |  |
Fair Value of Arrangements Granted |  |  |
Expected dividend as percentage, share options granted | 0.00% |  |
Expected volatility, share options granted | 0.00% |  |
Risk free interest rate, share options granted | 0.00% |  |
Weighted average expected life | 3 years 8 months 26 days |  |
Exercise price, share options granted | $ 3.73 |  |
Exercise price (in dollars per share) | 0 |  |
Weighted average of fair value (in dollars per share) | $ 3.73 |  |
Granted during the year (in shares) | shares | 1,109,500 |  |
Long Term Incentive Plan Date 1 July 2022, TSR RSUs |  |  |
Fair Value of Arrangements Granted |  |  |
Expected dividend as percentage, share options granted | 0.00% |  |
Expected volatility, share options granted | 120.00% |  |
Risk free interest rate, share options granted | 3.00% |  |
Weighted average expected life | 3 years 3 months |  |
Exercise price, share options granted | $ 3.73 |  |
Exercise price (in dollars per share) | 0 |  |
Weighted average of fair value (in dollars per share) | $ 3.22 |  |
Granted during the year (in shares) | shares | 138,189 |  |
Vesting period | 3 years 3 months |  |
Long Term Incentive Plan Date 1 July 2022, TSR RSUs |  |  |
Fair Value of Arrangements Granted |  |  |
Expected dividend as percentage, share options granted | 0.00% |  |
Expected volatility, share options granted | 120.00% |  |
Risk free interest rate, share options granted | 3.25% |  |
Weighted average expected life | 4 years 3 months |  |
Exercise price, share options granted | $ 3.73 |  |
Exercise price (in dollars per share) | 0 |  |
Weighted average of fair value (in dollars per share) | $ 3.38 |  |
Granted during the year (in shares) | shares | 138,189 |  |
Vesting period | 4 years 3 months |  |
Long Term Incentive Plan Date 1 July 2022, Share Price Target RSU |  |  |
Fair Value of Arrangements Granted |  |  |
Expected dividend as percentage, share options granted | 0.00% |  |
Expected volatility, share options granted | 120.00% |  |
Risk free interest rate, share options granted | 3.60% |  |
Weighted average expected life | 15 years |  |
Exercise price, share options granted | $ 3.73 |  |
Exercise price (in dollars per share) | 0 |  |
Weighted average of fair value (in dollars per share) | $ 1.72 |  |
Granted during the year (in shares) | shares | 611,260 |  |
Long Term Incentive Plan Date 22 December 2022, Service RSUs |  |  |
Fair Value of Arrangements Granted |  |  |
Expected dividend as percentage, share options granted | 0.00% |  |
Expected volatility, share options granted | 0.00% |  |
Risk free interest rate, share options granted | 0.00% |  |
Weighted average expected life | 1 year |  |
Exercise price, share options granted | $ 1.13 |  |
Exercise price (in dollars per share) | 0 |  |
Weighted average of fair value (in dollars per share) | $ 1.13 |  |
Granted during the year (in shares) | shares | 104,559 |  |
Long Term Incentive Plan Date 11 January 2023, Service RSUs |  |  |
Fair Value of Arrangements Granted |  |  |
Expected dividend as percentage, share options granted | 0.00% |  |
Expected volatility, share options granted | 0.00% |  |
Risk free interest rate, share options granted | 0.00% |  |
Weighted average expected life | 3 years 9 months |  |
Exercise price, share options granted | $ 1.53 |  |
Exercise price (in dollars per share) | 0 |  |
Weighted average of fair value (in dollars per share) | $ 1.53 |  |
Granted during the year (in shares) | shares | 169,870 |  |
Long Term Incentive Plan Date 11 January 2023, TSR RSUs |  |  |
Fair Value of Arrangements Granted |  |  |
Expected dividend as percentage, share options granted | 0.00% |  |
Expected volatility, share options granted | 120.00% |  |
Risk free interest rate, share options granted | 3.25% |  |
Weighted average expected life | 3 years 9 months |  |
Exercise price, share options granted | $ 1.53 |  |
Exercise price (in dollars per share) | 0 |  |
Weighted average of fair value (in dollars per share) | $ 1.32 |  |
Granted during the year (in shares) | shares | 42,467 |  |
Long Term Incentive Plan Date 19 June 2023, Service RSUs |  |  |
Fair Value of Arrangements Granted |  |  |
Expected dividend as percentage, share options granted | 0.00% |  |
Expected volatility, share options granted | 0.00% |  |
Risk free interest rate, share options granted | 0.00% |  |
Weighted average expected life | 2 years |  |
Exercise price, share options granted | $ 3.42 |  |
Exercise price (in dollars per share) | 0 |  |
Weighted average of fair value (in dollars per share) | $ 3.42 |  |
Granted during the year (in shares) | shares | 1,426,332 |  |
Long Term Incentive Plan Date 1 July 2023, Service RSUs |  |  |
Fair Value of Arrangements Granted |  |  |
Expected dividend as percentage, share options granted | 0.00% |  |
Expected volatility, share options granted | 0.00% |  |
Risk free interest rate, share options granted | 0.00% |  |
Weighted average expected life | 2 years |  |
Exercise price, share options granted | $ 4.66 |  |
Exercise price (in dollars per share) | 0 |  |
Weighted average of fair value (in dollars per share) | $ 4.66 |  |
Granted during the year (in shares) | shares | 1,676,083 |  |
Long Term Incentive Plan Date 1 July 2023, TSR RSUs |  |  |
Fair Value of Arrangements Granted |  |  |
Expected dividend as percentage, share options granted | 0.00% |  |
Expected volatility, share options granted | 0.00% |  |
Risk free interest rate, share options granted | 4.39% |  |
Weighted average expected life | 3 years |  |
Exercise price, share options granted | $ 4.66 |  |
Exercise price (in dollars per share) | 0 |  |
Weighted average of fair value (in dollars per share) | $ 2.40 |  |
Granted during the year (in shares) | shares | 1,534,598 |  |
Long Term Incentive Plan Date 17 July 2023, Service RSUs |  |  |
Fair Value of Arrangements Granted |  |  |
Expected dividend as percentage, share options granted | 0.00% |  |
Expected volatility, share options granted | 0.00% |  |
Risk free interest rate, share options granted | 0.00% |  |
Weighted average expected life | 1 year |  |
Exercise price, share options granted | $ 7.14 |  |
Exercise price (in dollars per share) | 0 |  |
Weighted average of fair value (in dollars per share) | $ 7.14 |  |
Granted during the year (in shares) | shares | 18,908 |  |
Long Term Incentive Plan Date 13 January 2024, Service RSUs |  |  |
Fair Value of Arrangements Granted |  |  |
Expected dividend as percentage, share options granted | 0.00% |  |
Expected volatility, share options granted | 0.00% |  |
Risk free interest rate, share options granted | 0.00% |  |
Weighted average expected life | 2 years |  |
Exercise price, share options granted | $ 5.15 |  |
Exercise price (in dollars per share) | 0 |  |
Weighted average of fair value (in dollars per share) | $ 5.15 |  |
Granted during the year (in shares) | shares | 45,078 |  |
Long Term Incentive Plan Date 13 January 2024, TSR RSUs |  |  |
Fair Value of Arrangements Granted |  |  |
Expected dividend as percentage, share options granted | 0.00% |  |
Expected volatility, share options granted | 0.00% |  |
Risk free interest rate, share options granted | 3.85% |  |
Weighted average expected life | 3 years |  |
Exercise price, share options granted | $ 5.15 |  |
Exercise price (in dollars per share) | 0 |  |
Weighted average of fair value (in dollars per share) | $ 2.98 |  |
Granted during the year (in shares) | shares | 40,127 |  |

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- Definition The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The exercise price of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The percentage of an expected dividend used to calculate the fair value of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of expense arising from share-based payment transactions in which the goods or services received did not qualify for recognition as assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 51 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_51_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The number of share options granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 45 -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_45_b_ii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The weighted average exercise price of share options granted in a share-based payment arrangement. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 45 -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_45_b_ii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The weighted average remaining contractual life of outstanding share options. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 45 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_45_d&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References No definition available. + Details
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