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Financial risk management and financial instruments - Credit Risk (Details) - customer
12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Credit risk      
Loss given default for unsecured financial assets 50.00% 50.00%  
Loss given default for secured financial assets 40.00% 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
Minimum      
Credit risk      
Contractual payment terms for receivables 30 days    
Maximum      
Credit risk      
Contractual payment terms for receivables 120 days    
South Africa      
Credit risk      
Percentage of total turnover 49.00% 48.00% 42.00%
Europe      
Credit risk      
Percentage of total turnover 19.00% 21.00% 24.00%
United States      
Credit risk      
Percentage of total turnover 16.00% 16.00% 18.00%