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Share capital - Shares Issued Roll Forward (Details) - shares
12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Reconciliation of number of shares outstanding      
Shares issued at beginning of year 635,676,817 634,244,336 632,365,757
Issued in terms of employee share schemes 4,990,795 1,432,481 1,878,579
Shares issued at end of year 640,667,612 635,676,817 634,244,336