XML 420 R181.htm IDEA: XBRL DOCUMENT v3.22.2.2
Financial risk management and financial instruments - Credit Risk (Details) - customer
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
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 48.00% 42.00% 44.00%
Europe      
Credit risk      
Percentage of total turnover 21.00% 24.00% 23.00%
United States      
Credit risk      
Percentage of total turnover 16.00% 18.00% 17.00%