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Financial risk management and financial instruments - Significant Exchange Rates (Details)
12 Months Ended
Jun. 30, 2022
R / €
Jun. 30, 2022
R / €
R / $
Jun. 30, 2021
R / €
Jun. 30, 2021
R / €
R / $
Jun. 30, 2022
R / $
Jun. 30, 2021
R / $
Financial risk management and financial instruments            
Average rate 17.15 15.21 18.38 15.40    
Closing rate 17.07 17.07 16.93 16.93 16.28 14.28