v3.26.3
Financial Risk Management - Fair Value Determination for Financial Assets and Liabilities (Details)
R in Millions
 12 Months Ended
Jun. 30, 2026
ZAR (R)
$ / lb
$ / Tonne
$ / Ounce
Jun. 30, 2026
ZAR (R)
$ / lb
Basis_points
Jun. 30, 2025
ZAR (R)
$ / lb
Basis_points
Jun. 30, 2024
ZAR (R)
Disclosure of fair value measurement of assets [line items]        
Assets R 125,990 R 125,990 R 76,879 R 59,976
Contingent consideration liabilities 1,881 1,881 976 850
Contingent consideration Liabilities Recognised R (2,120) R (2,120) R (1,457) R (965)
Closing Price Of Copper Assumption | $ / lb 4.78 4.78 4.25  
Copper Spot Price | $ / Tonne 13,279      
Silver Spot Price | $ / Ounce 58.26      
LME Copper implied volatility 22.30%      
Eva Copper operations and related assets        
Disclosure of fair value measurement of assets [line items]        
Discount rate applied to cash flow projections 8.10% 8.10%    
Eva Copper operations and related assets        
Disclosure of fair value measurement of assets [line items]        
Discount rate applied to cash flow projections 11.10% 11.10% 11.40%  
Contingent consideration Liabilities Recognised R (540) R (540) R (781)  
CSA NSR        
Disclosure of fair value measurement of assets [line items]        
Contingent consideration Liabilities Recognised R (1,100) R (1,100)    
Mponeng        
Disclosure of fair value measurement of assets [line items]        
Discount rate applied to cash flow projections 11.10% 11.10% 10.80%  
Contingent consideration Liabilities Recognised R (433) R (433) R (676)  
Copper Compound | Credit spread, measurement input [member]        
Disclosure of fair value measurement of assets [line items]        
Own Credit Spread Measurement 8.40%      
Silver Embedded Derivative | Credit spread, measurement input [member]        
Disclosure of fair value measurement of assets [line items]        
Own Credit Spread Measurement 7.70%      
Financial assets at fair value through other comprehensive income | Other non-current assets | Level 3         
Disclosure of fair value measurement of assets [line items]        
Assets R 147 147 107  
Financial assets at fair value through other comprehensive income | Other non-current assets | Level 1 of fair value hierarchy [member]        
Disclosure of fair value measurement of assets [line items]        
Assets 46 46    
Financial assets at fair value through other comprehensive income | Restricted Cash and Investments | Level 1 of fair value hierarchy [member]        
Disclosure of fair value measurement of assets [line items]        
Assets 449 449 384  
Financial assets at fair value through profit or loss | Other non-current assets | Level 3         
Disclosure of fair value measurement of assets [line items]        
Assets 29 29 45  
Financial assets at fair value through profit or loss | Derivative financial instruments | Level 2         
Disclosure of fair value measurement of assets [line items]        
Assets 2,391 2,391 568  
Financial assets at fair value through profit or loss | Restricted Cash and Investments | Level 2         
Disclosure of fair value measurement of assets [line items]        
Assets 1,963 1,963 1,828  
Financial assets at fair value through profit or loss | Trade receivables [member] | Level 2         
Disclosure of fair value measurement of assets [line items]        
Assets 735 735 86  
Financial liabilities at fair value through profit or loss | Derivative financial instruments | Level 2         
Disclosure of fair value measurement of assets [line items]        
Liabilities (4,531) (4,531) (7,747)  
Financial liabilities at fair value through profit or loss | Contingent consideration liability | Level 3         
Disclosure of fair value measurement of assets [line items]        
Liabilities R (2,120) R (2,120) R (1,457)  
Financial liabilities at fair value through profit or loss | Contingent consideration liability | Level 3  | Eva Copper operations and related assets        
Disclosure of fair value measurement of assets [line items]        
Discount rate applied to cash flow projections 11.10% 11.10% 11.40%  
Financial liabilities at fair value through profit or loss | Contingent consideration liability | Level 3  | CSA NSR        
Disclosure of fair value measurement of assets [line items]        
Discount rate applied to cash flow projections 7.00% 7.00%    
Financial liabilities at fair value through profit or loss | Contingent consideration liability | Level 3  | Mponeng operations and related assets        
Disclosure of fair value measurement of assets [line items]        
Discount rate applied to cash flow projections 11.10% 11.10% 10.80%  
Financial liabilities at fair value through profit or loss | Streaming contract liability | Level 3         
Disclosure of fair value measurement of assets [line items]        
Liabilities R (672) R (672)    
Financial liabilities at fair value through profit or loss | Copper Compound        
Disclosure of fair value measurement of assets [line items]        
Streaming Contract Liabilities (147) (147)    
Financial liabilities at fair value through profit or loss | Silver Embedded Derivative        
Disclosure of fair value measurement of assets [line items]        
Streaming Contract Liabilities R (525) (525)    
ARM BBEE Trust        
Disclosure of fair value measurement of assets [line items]        
Repayments Of Loans   R 23 R 28  
ARM BBEE Trust | Financial assets at fair value through profit or loss | Other non-current assets | Level 3         
Disclosure of fair value measurement of assets [line items]        
Discount rate applied to cash flow projections 11.20% 11.20% 11.50%  
Fair value model [member] | Contingent consideration liability | Eva Copper operations and related assets        
Disclosure of fair value measurement of assets [line items]        
Sensitivity analysis for types of fair value risk, reasonably change in risk variable, Percent   11.30% 11.80%  
Fair value model [member] | Contingent consideration liability | CSA NSR        
Disclosure of fair value measurement of assets [line items]        
Sensitivity analysis for types of fair value risk, reasonably increase in risk variable, Percent   11.30%    
Sensitivity analysis for types of fair value risk, reasonably decrease in risk variable, Percent   11.30%    
Sensitivity analysis for types of fair value risk, reasonably Increase in risk variable, Impact on Pre-Tax Earnings   R 131    
Sensitivity analysis for types of fair value risk, reasonably Decrease in risk variable, Impact on Pre-Tax Earnings   R 131    
Fair value model [member] | Contingent consideration liability | Mponeng        
Disclosure of fair value measurement of assets [line items]        
Sensitivity analysis for types of fair value risk, reasonably increase in risk variable, Percent   10.80% 11.50%  
Sensitivity analysis for types of fair value risk, reasonably decrease in risk variable, Percent   10.80% 11.50%  
Sensitivity analysis for types of fair value risk, reasonably Increase in risk variable, Impact on Pre-Tax Earnings   R 157 R 319  
Sensitivity analysis for types of fair value risk, reasonably Decrease in risk variable, Impact on Pre-Tax Earnings   R (157) R (319)  
Fair value model [member] | Streaming contract liability | Copper (b)        
Disclosure of fair value measurement of assets [line items]        
Sensitivity analysis for types of fair value risk, reasonably change in risk variable, Percent 10.00%      
Fair value model [member] | Streaming contract liability | Silver (c)        
Disclosure of fair value measurement of assets [line items]        
Sensitivity analysis for types of fair value risk, reasonably change in risk variable, Percent 20.00%      
Fair value model [member] | ARM BBEE Trust | Other non-current assets | Level 3         
Disclosure of fair value measurement of assets [line items]        
Sensitivity Analysis For Types Of Fair Value Risk, Reasonably Increase In Risk Variable, Basis points | Basis_points   22 28  
Sensitivity analysis for types of fair value risk, reasonable decrease in risk variable, Basis points | Basis_points   22 28