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Financial risk management and financial instruments - Sensitivity (Details)
R in Millions, $ in Millions
 12 Months Ended
Jun. 30, 2025
ZAR (R)
R / $
R / shares
$ / shares
Jun. 30, 2024
ZAR (R)
R / $
R / shares
$ / shares
Jun. 30, 2023
ZAR (R)
Nov. 08, 2022
USD ($)
Disclosure of financial instruments        
Unrealised fair value gain recognised in other expenses and income in operating profit R (2,003) R (2,364) R (3,287)  
US Dollar Convertible Bond, November 2027        
Disclosure of financial instruments        
Contract amount | $       $ 750
Other receivable - Contingent consideration from disposal of Uzbekistan GTL LLC        
Disclosure of financial instruments        
Amounts recognised in remeasurement items affecting operating income 1,436      
Balance at the end of the year R 1,436      
Other receivable - Contingent consideration from disposal of Uzbekistan GTL LLC | Non-performance and country risk        
Disclosure of financial instruments        
Increase in significant input variable (as a percent) 1.00%      
Decrease in significant input variable (as a percent) (1.00%)      
Other receivable - Contingent consideration from disposal of Uzbekistan GTL LLC | Non-performance and country risk | Minimum        
Disclosure of financial instruments        
Fair value resulting from change in inputs R 1,412      
Other receivable - Contingent consideration from disposal of Uzbekistan GTL LLC | Non-performance and country risk | Maximum        
Disclosure of financial instruments        
Fair value resulting from change in inputs R 1,444      
Other receivable - Contingent consideration from disposal of Uzbekistan GTL LLC | Non-performance risk        
Disclosure of financial instruments        
Significant inputs 0.0587      
Other receivable - Contingent consideration from disposal of Uzbekistan GTL LLC | Country risk        
Disclosure of financial instruments        
Significant inputs 0.0423      
Oxygen supply contract embedded derivative assets and liabilities        
Disclosure of financial instruments        
Balance at the beginning of the year R 34 477    
Amounts settled during the year 41 (1)    
Unrealised fair value gain recognised in other expenses and income in operating profit (924) (442) 794  
Balance at the end of the year R (849) R 34 477  
Oxygen supply contract embedded derivative assets and liabilities | Rand/USD spot price        
Disclosure of financial instruments        
Significant inputs | R / $ 17.75 18.19    
Increase in price or rate assumption | R / $ 1 1    
Decrease in price or rate assumption | R / $ (1) (1)    
Increase/(decrease) in profit or loss from increase in significant input variable R (469) R (478)    
Increase/(decrease) in profit or loss from decrease in significant input variable R 469 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 from increase in significant input variable R 73 R 81    
Increase/(decrease) in profit or loss from decrease in significant input variable R (74) R (82)    
Oxygen supply contract embedded derivative assets and liabilities | US$ Swap curve | Minimum        
Disclosure of financial instruments        
Significant inputs 0.0342 0.0363    
Oxygen supply contract embedded derivative assets and liabilities | US$ Swap curve | Maximum        
Disclosure of financial instruments        
Significant inputs 0.0407 0.0506    
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 from increase in significant input variable R (699) R (688)    
Increase/(decrease) in profit or loss from decrease in significant input variable R 791 R 784    
Oxygen supply contract embedded derivative assets and liabilities | Rand Swap curve | Minimum        
Disclosure of financial instruments        
Significant inputs 0.0694 0.0776    
Oxygen supply contract embedded derivative assets and liabilities | Rand Swap curve | Maximum        
Disclosure of financial instruments        
Significant inputs 0.1007 0.1035    
Convertible bond embedded derivative liability        
Disclosure of financial instruments        
Balance at the beginning of the year R 59 R 1,302    
Unrealised fair value gain recognised in other expenses and income in operating profit (52) (1,233) (867)  
Translation of foreign operations   (10)    
Balance at the end of the year R 7 R 59 R 1,302  
Convertible bond embedded derivative liability | Rand/USD spot price        
Disclosure of financial instruments        
Significant inputs | R / $ 17.75 18.19    
Convertible bond embedded derivative liability | Conversion price        
Disclosure of financial instruments        
Significant inputs | $ / shares 18.79 18.79    
Convertible bond embedded derivative liability | Spot share price        
Disclosure of financial instruments        
Significant inputs | R / shares 78.76 138.1    
Convertible bond embedded derivative liability | Observable bond market price        
Disclosure of financial instruments        
Significant inputs 0.9217 0.9042    
Convertible bond embedded derivative liability | Credit spread        
Disclosure of financial instruments        
Significant inputs 0.0485 0.0372    
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 from increase in significant input variable R (261) R (364)    
Increase/(decrease) in profit or loss from decrease in significant input variable R 7 R 59    
Convertible bond embedded derivative liability | Volatility        
Disclosure of financial instruments        
Significant inputs 0.34 0.2139    
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 from increase in significant input variable R (12) R (81)    
Increase/(decrease) in profit or loss from decrease in significant input variable R 6 R 45