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Employee-related expenditure - Number of employees (Details) - employee
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Number and average number of employees      
Permanent employees 28,725 30,670 31,112
Non-permanent employees 224 331 317
Total number of employees 28,949 31,001 31,429
Enaex Africa (Pty) Ltd      
Number and average number of employees      
Number of employees transferred 968    
LyondellBasell      
Number and average number of employees      
Number of employees transferred 401