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Financial risk management and financial instruments - Significant Exchange Rates (Details)
12 Months Ended
Jun. 30, 2025
R / €
Jun. 30, 2025
R / $
R / €
Jun. 30, 2024
R / €
Jun. 30, 2024
R / $
R / €
Jun. 30, 2025
R / $
Jun. 30, 2024
R / $
Financial risk management and financial instruments            
Average rate 19.76 18.17 20.24 18.71    
Closing rate 20.92 20.92 19.49 19.49 17.75 18.19