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Share capital - Shares Issued Roll Forward (Details) - shares
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Reconciliation of number of shares outstanding [abstract]      
Shares issued at beginning of year 679,822,439 679,775,162 679,480,362
Issued in terms of employee share schemes 1,776,361 47,277 294,800
Repurchase and cancellation of shares (43,503,454)    
Issued in terms of Sasol Khanyisa 7,465,582    
Shares issued at end of year 645,560,928 679,822,439 679,775,162
Shares in terms of Sasol Khanyisa      
Sasol BEE shares issued to Sasol Khanyisa Public 2,973,022    
Shares issued to Khanyisa Employee Share Ownership Plan 2,458,880    
Shares redesignated to SOL shares 1,876,288