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Remeasurement Items affecting operating profit - Assumptions (Details)
 12 Months Ended
Jun. 30, 2025
R / $
$ / T
$ / bbl
$ / gal
Jun. 30, 2024
R / $
$ / kJ
$ / gal
$ / T
$ / bbl
Jun. 30, 2023
R / $
$ / gal
$ / T
$ / kJ
$ / bbl
Impairment assumptions      
Period over which management has projected cash flows 5 years    
Crude oil price (Brent) | $ / bbl 72.16 83.06 88.02
Ethane price | $ / gal 0.334 0.3955 0.4233
Ethylene price | $ / T 747 745 773
Linear low density polyethylene (LLDPE) price | $ / T 1,039 1,091 1,247
Polyvinyl Chloride (PVC) price | $ / T 878 980 1,031
Oil Product Differentials | $ / bbl 11.44 10.86 12.08
Refining margin | $ / bbl 7.54 8.11 12.34
Exchange rate | R / $ 18.31 17.64 17.4
Period for calculation of assumptions used for impairment calculations 5 years 5 years 5 years
Term of average of median debt-to-equity ratios of peer group for WACC calculation 5 years    
South Africa      
Impairment assumptions      
Southern African gas purchase price (real) | $ / kJ   0.00001051 0.00001093
Growth rate - Producer Price Index 5.50% 5.50% 5.50%
Weighted average cost of capital 14.50% 15.00% 15.20%
United States      
Impairment assumptions      
Growth rate - Producer Price Index 2.00% 2.00% 2.00%
Weighted average cost of capital 9.10% 9.40% 9.07%
Europe      
Impairment assumptions      
Growth rate - Producer Price Index 2.00% 2.00% 2.00%
Europe | Minimum      
Impairment assumptions      
Weighted average cost of capital 7.60% 9.40% 9.07%
Europe | Maximum      
Impairment assumptions      
Weighted average cost of capital 10.00% 10.50% 10.68%
Mozambique      
Impairment assumptions      
Growth rate - Producer Price Index 2.00% 2.00% 2.00%
Weighted average cost of capital 18.40% 16.80%