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Financial risk management and fair values - Credit risk (Details) - debtor
6 Months Ended
Dec. 31, 2023
Jun. 30, 2023
Jun. 30, 2022
Disclosure of credit risk exposure      
Percentage of total trade receivables due from the Group's five largest debtors 40.00% 40.00% 53.00%
Number of Group's largest debtors 5 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      
Instalments within the periods ranging 32 months    
Period of other trade receivables is due 20 days    
Maximum      
Disclosure of credit risk exposure      
Instalments within the periods ranging 36 months    
Period of other trade receivables is due 180 days