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Key management personnel disclosures - Movement in Options and RSUs Outstanding Issued to Directors and Other Members of KMP (Details) - Share Options and Restricted Share Units [Member] | 12 Months Ended
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Jun. 30, 2024 shares $ / shares | Jun. 30, 2023 shares $ / shares
Number of Options and RSUs [Abstract] |  |
Outstanding at beginning of year (in shares) | shares | 10,008,224 | 6,973,516
Granted during the year (in shares) | shares | 2,564,809 | 3,070,379
Forfeited during the year (in shares) | shares | 0 | (31,671)
Exercised during the period (in shares) | shares | (104,559) | (4,000)
Outstanding at end of year (in shares) | shares | 12,468,474 | 10,008,224
Exercisable at end of year (in shares) | shares | 2,017,021 | 2,017,021
Weighted average exercise price |  |
Outstanding at beginning of year (in dollars per share) | $ / shares | $ 37.84 | $ 53.16
Granted during the year (in dollars per share) | $ / shares | 0 | 2.97
Weighted average exercise price of share options forfeited in share-based payment arrangement | $ / shares | 0 | 36.45
Weighted average exercise price of share options exercised in share-based payment arrangement | $ / shares | 0 | 0
Outstanding at end of year (in dollars per share) | $ / shares | 30.37 | 37.84
Exercisable at end of year (in dollars per share) | $ / shares | $ 3.92 | $ 3.87

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