v3.26.1
Financial risk management and financial instruments - Interest Rate Risk (Details)
R in Millions
12 Months Ended
Jun. 30, 2026
ZAR (R)
item
Jun. 30, 2025
ZAR (R)
item
Jun. 30, 2024
ZAR (R)
Financial risk management and financial instruments      
Number of open interest rate swaps | item 0 0  
Financial assets R 93,127 R 85,517  
Financial liabilities R (146,464) R (155,495)  
Variable rate as a percentage of total financial assets 86.00% 85.00%  
Fixed rate as a percentage of total financial assets 14.00% 15.00%  
Variable rate as a percentage of total financial liabilities 28.00% 30.00%  
Fixed rate as a percentage of total financial liabilities 72.00% 70.00%  
Variable      
Financial risk management and financial instruments      
Financial assets R 40,542 R 37,790  
Financial liabilities (25,705) (30,886)  
Net financial instruments 14,837 6,904  
Fixed      
Financial risk management and financial instruments      
Financial assets 6,698 6,895  
Financial liabilities (66,786) (71,759)  
Net financial instruments R (60,088) R (64,864)  
Interest rate risk | Variable      
Financial risk management and financial instruments      
Percentage of increase in risk variable used for sensitivity analysis 1.00% 1.00% 1.00%
Percentage of decrease in risk variable used for sensitivity analysis 1.00% 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 245 R 247 R 250
Equity impact of increase in risk variable 245 247 250
Interest rate risk | Variable | Europe      
Financial risk management and financial instruments      
Income statement impact of increase in risk variable 24 15 32
Equity impact of increase in risk variable 24 15 32
Interest rate risk | Variable | United States      
Financial risk management and financial instruments      
Income statement impact of increase in risk variable (100) (218) (328)
Equity impact of increase in risk variable (100) (218) (328)
Interest rate risk | Variable | Other      
Financial risk management and financial instruments      
Income statement impact of increase in risk variable 26 22 21
Equity impact of increase in risk variable R 26 R 22 R 21