v3.25.3
Financial Risk Management - Fair Value Determination for Financial Assets and Liabilities (Details)
R in Millions
 12 Months Ended
Jun. 30, 2025
ZAR (R)
$ / lb
Basis_points
Jun. 30, 2024
ZAR (R)
$ / lb
Basis_points
Jun. 30, 2023
ZAR (R)
Disclosure of fair value measurement of assets [line items]      
Assets R 77,503 R 60,460 R 57,240
Contingent consideration liability 976 850  
Contingent consideration Liabilities Recognised R (1,457) R (965) R (589)
Closing Price Of Copper Assumption | $ / lb 4.25 4.00  
Mponeng      
Disclosure of fair value measurement of assets [line items]      
Discount rate applied to cash flow projections 10.80% 10.50%  
Contingent consideration Liabilities Recognised R (676) R (587)  
Eva Copper operations and related assets      
Disclosure of fair value measurement of assets [line items]      
Discount rate applied to cash flow projections 11.40% 11.40%  
Contingent consideration Liabilities Recognised R (781) R (378)  
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 107 88  
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 384 335  
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 45 68  
Financial assets at fair value through profit or loss | Derivative financial instruments | Level 2       
Disclosure of fair value measurement of assets [line items]      
Assets 568 1,011  
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 1,828 1,569  
Financial assets at fair value through profit or loss | Trade receivables [member] | Level 2       
Disclosure of fair value measurement of assets [line items]      
Assets 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 (7,747) (2,111)  
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 (1,457) R (965)  
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 10.80% 10.50%  
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 11.40% 11.40%  
ARM BBEE Trust      
Disclosure of fair value measurement of assets [line items]      
Repayments Of Loans R 28 R 42  
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 11.50% 12.60%  
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 11.50% 9.70%  
Sensitivity analysis for types of fair value risk, reasonably decrease in risk variable, Percent 11.50% 9.70%  
Sensitivity analysis for types of fair value risk, reasonably Increase in risk variable, Impact on Pre-Tax Earnings R 319 R 354  
Sensitivity analysis for types of fair value risk, reasonably Decrease in risk variable, Impact on Pre-Tax Earnings R (319) R (340)  
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 11.80% 10.40%  
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 28 73  
Sensitivity analysis for types of fair value risk, reasonable decrease in risk variable, Basis points | Basis_points 28 73