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Share capital - Shares Issued Roll Forward (Details) - shares
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Reconciliation of number of shares outstanding      
Shares issued at beginning of year 634,244,336 632,365,757 631,028,318
Issued in terms of employee share schemes 1,432,481 1,878,579 1,337,439
Shares issued at end of year 635,676,817 634,244,336 632,365,757