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Financial risk management and financial instruments - Currency Exposure (Details) - Exchange rate - ZAR (R)
R in Millions
12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Financial risk management and financial instruments    
Percentage of change in significant exposure used for sensitivity analysis 10.00% 10.00%
Euro    
Financial risk management and financial instruments    
Net exposure R 79 R 1,709
Equity impact of decrease in risk exposure 8 171
Income statement impact of decrease in risk exposure 8 171
Euro | External balances    
Financial risk management and financial instruments    
Net exposure on assets 2,035 3,950
Net exposure on liabilities (547) (227)
Net exposure 1,488 3,723
Euro | Balances between group companies    
Financial risk management and financial instruments    
Net exposure (1,409) (2,014)
US Dollar    
Financial risk management and financial instruments    
Net exposure 20,576 27,401
Equity impact of decrease in risk exposure 2,058 2,740
Income statement impact of decrease in risk exposure 2,058 2,740
US Dollar | External balances    
Financial risk management and financial instruments    
Net exposure on assets 5,340 4,581
Net exposure on liabilities (3,631) (2,949)
Net exposure 1,709 1,632
US Dollar | Balances between group companies    
Financial risk management and financial instruments    
Net exposure 18,867 25,769
Trade and other payables | Euro | External balances    
Financial risk management and financial instruments    
Net exposure on liabilities (547) (227)
Trade and other payables | US Dollar | External balances    
Financial risk management and financial instruments    
Net exposure on liabilities (3,631) (2,949)
Long-term receivables | Euro | External balances    
Financial risk management and financial instruments    
Net exposure on assets 127 67
Long-term receivables | US Dollar | External balances    
Financial risk management and financial instruments    
Net exposure on assets 645 745
Trade and other receivables | Euro | External balances    
Financial risk management and financial instruments    
Net exposure on assets 429 564
Trade and other receivables | US Dollar | External balances    
Financial risk management and financial instruments    
Net exposure on assets 3,912 2,595
Cash and cash equivalents | Euro | External balances    
Financial risk management and financial instruments    
Net exposure on assets 1,479 3,319
Cash and cash equivalents | US Dollar | External balances    
Financial risk management and financial instruments    
Net exposure on assets R 783 R 1,241