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Share-based payment reserve - The Sasol Inzalo share transaction (Details) - R / shares
12 Months Ended
Jun. 27, 2018
Jun. 04, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 25, 2018
May 31, 2008
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Repurchase and cancellation of shares     43,503,454      
Sasol Inzalo share transaction            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Percentage of transfer of beneficial ownership           10.00%
Number of shares transferred           63,100,000
Repurchase and cancellation of shares 9,461,882 25,231,686        
Share repurchase price   R 0.01     R 475.03  
The Sasol Inzalo Foundation            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Number of shares in entity held by entity or by its subsidiaries or associates     9,461,882      
Estimated share price at unwind of transaction to create value for participants     R 462.00 R 456.30