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OTHER INVESTMENTS - Investments in other entities (Details) - ZAR (R)
R in Millions
12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items]      
Investments in other entities R 322.5 R 180.4  
Fair value adjustment on equity instruments at fair value through OCI 139.8 11.8 R 17.2
Dividends received on equity instruments at fair value through OCI (56.3) (29.3) R (78.3)
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 11.2 7.5  
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 311.3 172.9  
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 3.6 0.3  
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 11.2 7.5  
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 1.90%    
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 1.50%    
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 (56.3) (29.3)  
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 135.2 10.5  
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 302.0 166.8  
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 R 1.0 1.0  
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 6.8 5.9  
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 2.4 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) 52,965    
Percentage of interest held 5.70%    
Investments in other entities R 0.1 R 0.1