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Employee benefits and share-based payments (Details) - shares
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Employee benefits and share-based payments      
At the beginning 200,000.0 2,100,000 2,400,000
Granted 0 (100,000) (300,000)
At the end 200,000 200,000.0 2,100,000