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Share-based payments - Reconciliation of Outstanding Share Options (Details) - Share Options
 12 Months Ended
Jun. 30, 2024
shares
$ / shares
Jun. 30, 2023
shares
$ / shares
Number of options    
Outstanding at beginning of year (in shares) | shares 8,906,839 9,010,547
Granted during the year (in shares) | shares 34,454 0
Forfeited during the year (in shares) | shares 0 (103,708)
Exercised during the period (in shares) | shares (457,282) 0
Outstanding at end of year (in shares) | shares 8,484,011 8,906,839
Exercisable at end of year (in shares) | shares 3,332,076 3,485,302
Weighted average exercise price    
Outstanding at beginning of year (in dollars per share) $ 41.93 $ 41.67
Granted during the year (in dollars per share) 13.47 0
Weighted average exercise price of share options forfeited in share-based payment arrangement 0 20.03
Weighted average exercise price of share options exercised in share-based payment arrangement 1.89 0
Outstanding at end of year (in dollars per share) 43.97 41.93
Exercisable at end of year (in dollars per share) $ 3.01 $ 2.97
Weighted average remaining contractual life 6 years 6 months 21 days 7 years 6 months 25 days
Weighted average share price at date of exercise (in dollars per share) $ 9.27  
Minimum    
Weighted average exercise price    
Outstanding at beginning of year (in dollars per share) 1.53  
Outstanding at end of year (in dollars per share) 1.53 $ 1.53
Maximum    
Weighted average exercise price    
Outstanding at beginning of year (in dollars per share) 75.00  
Outstanding at end of year (in dollars per share) $ 75.00 $ 75.00