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Operating costs - Average number of employees (Details) - employee
 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Disclosure of operating segments [line items]      
Average number of employees 30,367 30,237 27,987
Operating segments | North America      
Disclosure of operating segments [line items]      
Average number of employees 2,869 2,884 2,811
Operating segments | Europe      
Disclosure of operating segments [line items]      
Average number of employees 2,932 2,789 3,014
Operating segments | Asia Pacific      
Disclosure of operating segments [line items]      
Average number of employees 6,588 6,856 6,500
Operating segments | Latin America and Caribbean      
Disclosure of operating segments [line items]      
Average number of employees 1,650 1,495 1,500
Operating segments | Africa      
Disclosure of operating segments [line items]      
Average number of employees 3,290 3,526 4,061
Operating segments | SC&P      
Disclosure of operating segments [line items]      
Average number of employees 6,977 6,934 5,025
Corporate and other      
Disclosure of operating segments [line items]      
Average number of employees 6,061 5,753 5,076