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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
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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 |

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