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Financial risk management and financial instruments - Interest Rate Risk (Details)
R in Millions
12 Months Ended
Jun. 30, 2025
ZAR (R)
item
Jun. 30, 2024
ZAR (R)
item
Financial risk management and financial instruments    
Number of open interest rate swaps | item 0 0
Financial assets R 85,517 R 86,216
Financial liabilities R (155,495) R (168,266)
Variable rate as a percentage of total financial assets 85.00% 86.00%
Fixed rate as a percentage of total financial assets 15.00% 14.00%
Variable rate as a percentage of total financial liabilities 30.00% 38.00%
Fixed rate as a percentage of total financial liabilities 70.00% 62.00%
Variable    
Financial risk management and financial instruments    
Financial assets R 37,790 R 42,053
Financial liabilities (30,886) (44,471)
Net financial instruments 6,904 (2,418)
Fixed    
Financial risk management and financial instruments    
Financial assets 6,895 7,046
Financial liabilities (71,759) (72,680)
Net financial instruments R (64,864) R (65,634)
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 247 R 250
Interest rate risk | Variable | Europe    
Financial risk management and financial instruments    
Income statement impact of increase in risk variable 15 32
Interest rate risk | Variable | United States    
Financial risk management and financial instruments    
Income statement impact of increase in risk variable (218) (328)
Interest rate risk | Variable | Other    
Financial risk management and financial instruments    
Income statement impact of increase in risk variable R 22 R 21