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Restricted Investments - Reconciliation of Movement in Investments Held by Environmental Trust Funds (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Increase (decrease) in financial assets      
Balance at beginning of year R 3,271    
Fair value gain 64 R 71 R 4
Balance at end of year 3,301 3,271  
Investments held by environmental trust funds      
Increase (decrease) in financial assets      
Balance at beginning of year 3,238 2,621  
Interest income 168 157 153
Fair value gain 48 79  
Moab Khotsong acquisition 0 382  
Equity-linked deposits acquired 300 0  
(Maturity)/acquisition of fixed deposits (481) 6  
Net transfer of cash and cash equivalents 183 (7)  
Withdrawal of funds for rehabilitation work performed (183) 0  
Balance at end of year R 3,273 3,238 R 2,621
Nufcor SA | Investments held by environmental trust funds      
Increase (decrease) in financial assets      
Moab Khotsong acquisition   R 58