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Financial risk management and fair values - Credit risk (Details) - debtor
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Disclosure of credit risk exposure [line items]    
Percentage of total trade receivables due from the Group's five largest debtors 53.00% 30.00%
Number of Group's largest debtors 5 5
Period of past due that debtors are requested to settle before any further credit is granted 6 months  
Minimum.    
Disclosure of credit risk exposure [line items]    
Period of trade receivables is due 30 days  
Maximum.    
Disclosure of credit risk exposure [line items]    
Period of trade receivables is due 180 days