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Financial risk management and financial instruments - Significant Exchange Rates (Details)
12 Months Ended
Jun. 30, 2021
R / €
Jun. 30, 2021
R / €
R / $
Jun. 30, 2020
R / €
Jun. 30, 2020
R / $
R / €
Jun. 30, 2021
R / $
Jun. 30, 2020
R / $
Financial risk management and financial instruments            
Average rate 18.38 15.40 17.34 15.69    
Closing rate 16.93 16.93 19.46 19.46 14.28 17.33