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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, 2023
Jun. 30, 2022
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 754 R 4,712
Equity impact of decrease in risk exposure 75 325
Income statement impact of decrease in risk exposure 75 325
Euro | External balances    
Financial risk management and financial instruments    
Net exposure on assets 3,379 2,897
Net exposure on liabilities (302) (166)
Net exposure 3,077 2,731
Euro | Balances between group companies    
Financial risk management and financial instruments    
Net exposure (2,323) 1,981
US Dollar    
Financial risk management and financial instruments    
Net exposure 12,086 12,390
Equity impact of decrease in risk exposure 1,209 1,239
Income statement impact of decrease in risk exposure 1,209 1,239
US Dollar | External balances    
Financial risk management and financial instruments    
Net exposure on assets 5,731 8,656
Net exposure on liabilities (2,129) (4,552)
Net exposure 3,602 4,104
US Dollar | Balances between group companies    
Financial risk management and financial instruments    
Net exposure 8,484 8,286
Trade and other payables | Euro | External balances    
Financial risk management and financial instruments    
Net exposure on liabilities (302) (166)
Trade and other payables | US Dollar | External balances    
Financial risk management and financial instruments    
Net exposure on liabilities (2,129) (4,552)
Long-term receivables | US Dollar | External balances    
Financial risk management and financial instruments    
Net exposure on assets 339 336
Trade and other receivables | Euro | External balances    
Financial risk management and financial instruments    
Net exposure on assets 544 739
Trade and other receivables | US Dollar | External balances    
Financial risk management and financial instruments    
Net exposure on assets 3,520 4,961
Cash and cash equivalents | Euro | External balances    
Financial risk management and financial instruments    
Net exposure on assets 2,835 2,158
Cash and cash equivalents | US Dollar | External balances    
Financial risk management and financial instruments    
Net exposure on assets R 1,872 R 3,359