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Share capital - Share-based long-term incentives (Details) - shares
1 Months Ended 9 Months Ended
Mar. 31, 2025
Jun. 30, 2025
Share capital    
Options granted 425,000 425,000
Employee Stock Option | Maximum    
Share capital    
Award term (in years)   10 years
Restricted stock units    
Share capital    
Number of shares per unit of RSU   1
Vesting period (in years)   2 years
RSU granted 2,478,753 2,479,000