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Financial risk management and financial instruments - Interest Rate Risk (Details)
R in Millions
12 Months Ended
Jun. 30, 2024
ZAR (R)
item
Jun. 30, 2023
ZAR (R)
item
Financial risk management and financial instruments    
Number of open interest rate swaps | item 0 0
Financial assets R 86,216 R 92,029
Financial liabilities R (168,266) R (177,816)
Variable rate as a percentage of total financial assets 86.00% 88.00%
Fixed rate as a percentage of total financial assets 14.00% 12.00%
Variable rate as a percentage of total financial liabilities 38.00% 17.00%
Fixed rate as a percentage of total financial liabilities 62.00% 83.00%
US Dollar Bond, March 2024    
Financial risk management and financial instruments    
Repayments of borrowings R 1,500  
Variable    
Financial risk management and financial instruments    
Financial assets 42,053 R 50,123
Financial liabilities (44,471) (20,911)
Net financial instruments (2,418) 29,212
Fixed    
Financial risk management and financial instruments    
Financial assets 7,046 7,005
Financial liabilities (72,680) (103,317)
Net financial instruments R (65,634) R (96,312)
Interest rate risk | Variable    
Financial risk management and financial instruments    
Percentage of increase in risk variable used for sensitivity analysis 1.00% 1.00%
Percentage of decrease in risk variable used for sensitivity analysis 1.00% 1.00%
Interest rate risk | Variable | South Africa    
Financial risk management and financial instruments    
Income statement impact of increase in risk variable R 250 R 300
Interest rate risk | Variable | Europe    
Financial risk management and financial instruments    
Income statement impact of increase in risk variable 32 28
Interest rate risk | Variable | United States    
Financial risk management and financial instruments    
Income statement impact of increase in risk variable (328) (63)
Interest rate risk | Variable | Other    
Financial risk management and financial instruments    
Income statement impact of increase in risk variable R 21 R 26