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Financial risk management and financial instruments - Sensitivity (Details)
R in Millions, $ in Millions
 12 Months Ended
Jun. 30, 2024
ZAR (R)
$ / shares
R / $
R / shares
Jun. 30, 2023
ZAR (R)
R / $
R / shares
$ / shares
Jun. 30, 2022
ZAR (R)
Nov. 08, 2022
USD ($)
Disclosure of financial instruments        
Unrealised fair value loss recognised in other operating expenses and income R (2,364) R (3,287) R 18,325  
US Dollar Convertible Bond, November 2027        
Disclosure of financial instruments        
Contract amount | $       $ 750
Oxygen supply contract embedded derivative assets and liabilities        
Disclosure of financial instruments        
Balance at the beginning of the year 477 (339)    
Amounts settled during the year (1) 22    
Unrealised fair value loss recognised in other operating expenses and income (442) 794 (64)  
Balance at the end of the year R 34 R 477 R (339)  
Oxygen supply contract embedded derivative assets and liabilities | Rand/USD spot price        
Disclosure of financial instruments        
Significant inputs liabilities | R / $ 18.19 18.76    
Increase in price or rate assumption | R / $ 1 1    
Decrease in price or rate assumption | R / $ (1) (1)    
Increase/(decrease) in profit or loss and equity from increase in significant input variable R (478) R (478)    
Increase/(decrease) in profit or loss and equity from decrease in significant input variable R 478 R 478    
Oxygen supply contract embedded derivative assets and liabilities | US$ Swap curve        
Disclosure of financial instruments        
Increase in significant input variable (as a percent) 0.10% 0.10%    
Decrease in significant input variable (as a percent) (0.10%) (0.10%)    
Increase/(decrease) in profit or loss and equity from increase in significant input variable R 81 R 87    
Increase/(decrease) in profit or loss and equity from decrease in significant input variable R (82) R (89)    
Oxygen supply contract embedded derivative assets and liabilities | US$ Swap curve | Minimum        
Disclosure of financial instruments        
Significant inputs liabilities 0.0363 0.0330    
Oxygen supply contract embedded derivative assets and liabilities | US$ Swap curve | Maximum        
Disclosure of financial instruments        
Significant inputs liabilities 0.0506 0.0560    
Oxygen supply contract embedded derivative assets and liabilities | Rand Swap curve        
Disclosure of financial instruments        
Increase in significant input variable (as a percent) 1.00% 1.00%    
Decrease in significant input variable (as a percent) (1.00%) (1.00%)    
Increase/(decrease) in profit or loss and equity from increase in significant input variable R (688) R (734)    
Increase/(decrease) in profit or loss and equity from decrease in significant input variable R 784 R 848    
Oxygen supply contract embedded derivative assets and liabilities | Rand Swap curve | Minimum        
Disclosure of financial instruments        
Significant inputs liabilities 0.0776 0.0836    
Oxygen supply contract embedded derivative assets and liabilities | Rand Swap curve | Maximum        
Disclosure of financial instruments        
Significant inputs liabilities 0.1035 0.1041    
Convertible bond embedded derivative liability        
Disclosure of financial instruments        
Balance at the beginning of the year R 1,302      
Recognition of embedded derivative upon issue of bond   R 2,089    
Unrealised fair value loss recognised in other operating expenses and income (1,233) (867)    
Translation of foreign operations (10) 80    
Balance at the end of the year R 59 R 1,302    
Convertible bond embedded derivative liability | Rand/USD spot price        
Disclosure of financial instruments        
Significant inputs liabilities | R / $ 18.19 18.83    
Convertible bond embedded derivative liability | Conversion price        
Disclosure of financial instruments        
Significant inputs liabilities | $ / shares 18.79 19.86    
Convertible bond embedded derivative liability | Spot share price        
Disclosure of financial instruments        
Significant inputs liabilities | R / shares 138.10 233.26    
Convertible bond embedded derivative liability | Observable bond market price        
Disclosure of financial instruments        
Significant inputs liabilities 0.9042 0.947    
Convertible bond embedded derivative liability | Credit spread        
Disclosure of financial instruments        
Significant inputs liabilities 0.0372 0.0460    
Increase in significant input variable (as a percent) 1.00% 1.00%    
Decrease in significant input variable (as a percent) (1.00%) (1.00%)    
Increase/(decrease) in profit or loss and equity from increase in significant input variable R (364) R (433)    
Increase/(decrease) in profit or loss and equity from decrease in significant input variable R 59 R 455    
Convertible bond embedded derivative liability | Volatility        
Disclosure of financial instruments        
Significant inputs liabilities 0.2139 0.2784    
Increase in significant input variable (as a percent) 5.00% 5.00%    
Decrease in significant input variable (as a percent) (5.00%) (5.00%)    
Increase/(decrease) in profit or loss and equity from increase in significant input variable R (81) R (377)    
Increase/(decrease) in profit or loss and equity from decrease in significant input variable R 45 R 364