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Financial risk management and financial instruments - Credit Risk (Details) - customer
 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Financial risk management and financial instruments      
Loss given default for unsecured financial assets 50.00%    
Loss given default for secured financial assets 40.00%    
Number of customers representing more than ten percent of turnover 0 0 0
Number of customers representing more than ten percent of trade receivables 0 0 0