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Employee benefits and sharebased payments (Details) - shares
shares in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Employee benefits and sharebased payments      
At the beginning 3,865,110 4,162,917 4,483,656
Granted 368,934 297,807 320,739
At the end 3,496,176 3,865,110 4,162,917