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Share capital - Authorised, Issued, and Held in Reserve (Details) - R / shares
Jun. 30, 2018
Nov. 17, 2017
Nov. 16, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Disclosure of classes of share capital [line items]            
Shares authorised 1,314,407,571     1,175,000,000 1,175,000,000  
Shares issued 645,560,928     679,822,439 679,775,162 679,480,362
Unissued shares 668,846,643     495,177,561 495,224,838  
Ordinary Shares            
Disclosure of classes of share capital [line items]            
Par value per share (in Rand per share) R 0     R 0 R 0  
Shares authorised 1,127,690,590     1,127,690,590 1,127,690,590  
Shares issued 623,081,550     651,436,793 651,389,516  
Unissued shares 504,609,040     476,253,797 476,301,074  
Sasol preferred ordinary shares of no par value            
Disclosure of classes of share capital [line items]            
Par value per share (in Rand per share) R 0     R 0 R 0  
Shares authorised 28,385,646     28,385,646 28,385,646  
Shares issued 16,085,199     25,547,081 25,547,081  
Unissued shares 12,300,447     2,838,565 2,838,565  
Sasol BEE ordinary shares of no par value            
Disclosure of classes of share capital [line items]            
Par value per share (in Rand per share) R 0     R 0 R 0  
Shares authorised 158,331,335 158,331,335 18,923,764 18,923,764 18,923,764  
Shares issued 6,394,179     2,838,565 2,838,565  
Unissued shares 151,937,156     16,085,199 16,085,199