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CAPITAL MANAGEMENT - Narrative (Details)
R in Millions
 12 Months Ended
Jun. 30, 2020
ZAR (R)
Sep. 30, 2020
ZAR (R)
Jun. 30, 2019
ZAR (R)
Dec. 31, 2018
ZAR (R)
Disclosure of objectives, policies and processes for managing capital [line items]        
Debt ratio 0.5      
Interest coverage ratio 0.25      
Phase 1 of FWGR [member]        
Disclosure of objectives, policies and processes for managing capital [line items]        
Undrawn Borrowing Facilities R 300   R 300  
Committed revolving credit facility (RCF) [member] | Guarantee Ekurhuleni Local Municipality [member]        
Disclosure of objectives, policies and processes for managing capital [line items]        
Undrawn Borrowing Facilities       R 125
Uncommitted revolving credit facility (RCF) [member]        
Disclosure of objectives, policies and processes for managing capital [line items]        
Undrawn Borrowing Facilities   R 200    
Uncommitted revolving credit facility (RCF) [member] | Bottom of Range [member]        
Disclosure of objectives, policies and processes for managing capital [line items]        
Increase (decrease) to interest rate margin 2.75%      
Uncommitted revolving credit facility (RCF) [member] | Top of range [member]        
Disclosure of objectives, policies and processes for managing capital [line items]        
Increase (decrease) to interest rate margin 3.25%