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Share capital - Shares Issued Roll Forward (Details) - shares
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Reconciliation of number of shares outstanding      
Shares issued at beginning of year 632,365,757 631,028,318 645,560,928
Issued in terms of employee share schemes 1,878,579 1,337,439 1,566,581
Repurchase and cancellation of shares     (16,085,199)
Issued in terms of Sasol Khanyisa     (13,992)
Shares issued at end of year 634,244,336 632,365,757 631,028,318