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Financial risk management and financial instruments - Interest Rate Risk (Details)
R in Millions
12 Months Ended
Mar. 15, 2022
item
Jun. 30, 2023
ZAR (R)
item
Jun. 30, 2022
ZAR (R)
Financial risk management and financial instruments      
Number of open interest rate swaps | item   0  
Financial assets   R 92,029 R 87,991
Financial liabilities   R (177,816) R (168,123)
Variable rate as a percentage of total financial assets   88.00% 85.00%
Fixed rate as a percentage of total financial assets   12.00% 15.00%
Variable rate as a percentage of total financial liabilities   17.00% 25.00%
Fixed rate as a percentage of total financial liabilities   83.00% 75.00%
Variable      
Financial risk management and financial instruments      
Financial assets   R 50,123 R 40,250
Financial liabilities   (20,911) (26,094)
Net financial instruments   29,212 14,156
Fixed      
Financial risk management and financial instruments      
Financial assets   7,005 7,121
Financial liabilities   (103,317) (78,913)
Net financial instruments   R (96,312) (71,792)
Interest rate swap | Cash flow hedge | North America      
Financial risk management and financial instruments      
Amount recognised in other operating expenses on reclassification from cash flow hedge reserve     R 1,100
Interest rate swap | Cash flow hedge | SOFR      
Financial risk management and financial instruments      
Number of instruments transitioned | item 2    
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 300 R 257
Interest rate risk | Variable | Europe      
Financial risk management and financial instruments      
Income statement impact of increase in risk variable   28 22
Interest rate risk | Variable | United States      
Financial risk management and financial instruments      
Income statement impact of increase in risk variable   (63) (153)
Interest rate risk | Variable | Other      
Financial risk management and financial instruments      
Income statement impact of increase in risk variable   R 26 R 16