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Operating costs - Average number of employees (Details) - employee
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of operating segments [line items]      
Average number of employees 30,237 27,987 27,566
Operating segments | North America      
Disclosure of operating segments [line items]      
Average number of employees 2,884 2,811 2,562
Operating segments | Europe      
Disclosure of operating segments [line items]      
Average number of employees 2,789 3,014 3,237
Operating segments | Asia Pacific      
Disclosure of operating segments [line items]      
Average number of employees 6,856 6,500 6,474
Operating segments | Latin America and Caribbean      
Disclosure of operating segments [line items]      
Average number of employees 1,495 1,500 1,505
Operating segments | Africa      
Disclosure of operating segments [line items]      
Average number of employees 3,526 4,061 4,016
Operating segments | SC&P      
Disclosure of operating segments [line items]      
Average number of employees 6,934 5,025 5,085
Corporate and other      
Disclosure of operating segments [line items]      
Average number of employees 5,753 5,076 4,687