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OTHER INVESTMENTS - Investments in other entities (Details) - ZAR (R)
R in Millions
12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Investments in other entities R 168.6 R 151.4  
Fair value adjustment on equity instruments at fair value through OCI 17.2 (15.7) R (28.2)
Dividends received on equity instruments at fair value through OCI (78.3) (71.5) R (76.1)
Listed investments (Fair value hierarchy Level 1)      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Investments in other entities 7.2 10.7  
Unlisted investments (Fair value hierarchy Level 3)      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Investments in other entities 161.4 140.7  
West Wits Mining Limited ("WWM")      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Fair value adjustment on equity instruments at fair value through OCI R (3.5) (32.8)  
West Wits Mining Limited ("WWM") | Listed investments (Fair value hierarchy Level 1)      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Shares held in other entities (in shares) 47,812,500    
Investments in other entities R 7.2 10.7  
West Wits Mining Limited ("WWM") | Listed investments (Fair value hierarchy Level 1) | Top of range      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Percentage of interest held 2.40%    
West Wits Mining Limited ("WWM") | Listed investments (Fair value hierarchy Level 1) | Bottom of range      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Percentage of interest held 2.10%    
Rand Refinery Proprietary Limited ("Rand Refinery")      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Dividends received on equity instruments at fair value through OCI R (77.4) (70.1)  
Rand Refinery Proprietary Limited ("Rand Refinery") | At fair value      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Fair value adjustment on equity instruments at fair value through OCI R 20.2 16.8  
Rand Refinery Proprietary Limited ("Rand Refinery") | Unlisted investments (Fair value hierarchy Level 3)      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Shares held in other entities (in shares) 44,438    
Percentage of interest held 11.30%    
Investments in other entities R 156.3 136.1  
Rand Mutual Assurance Company Limited      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Fair value adjustment on equity instruments at fair value through OCI 0.5 0.3  
Dividends received on equity instruments at fair value through OCI R (0.9) (1.4)  
Rand Mutual Assurance Company Limited | Unlisted investments (Fair value hierarchy Level 3)      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Shares held in other entities (in shares) 12,659    
Percentage of interest held 1.30%    
Investments in other entities R 4.9 4.4  
Guardrisk Insurance Company Limited (Cell Captive A170) | Unlisted investments (Fair value hierarchy Level 3)      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Shares held in other entities (in shares) 20    
Percentage of interest held 100.00%    
Investments in other entities R 0.1 0.1  
Chamber of Mines Building Company Proprietary Limited | Unlisted investments (Fair value hierarchy Level 3)      
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Shares held in other entities (in shares) 42,292    
Percentage of interest held 4.50%    
Investments in other entities R 0.1 R 0.1