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Share capital - Shares Issued Roll Forward (Details) - shares
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Reconciliation of number of shares outstanding      
Shares issued at beginning of year 645,560,928 679,822,439 679,775,162
Issued in terms of employee share schemes 1,566,581 1,776,361 47,277
Repurchase and cancellation of shares (16,085,199) (43,503,454)  
Issued in terms of Sasol Khanyisa (13,992) 7,465,582  
Shares issued at end of year 631,028,318 645,560,928 679,822,439