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Remeasurement Items affecting operating profit - Assumptions (Details)
 12 Months Ended
Jun. 30, 2023
R / $
$ / kJ
$ / bbl
R / T
$ / gal
Jun. 30, 2022
R / $
$ / gal
$ / bbl
R / T
$ / kJ
Jun. 30, 2021
R / $
$ / kJ
$ / bbl
$ / gal
R / T
Impairment assumptions      
Period over which management has projected cash flows 5 years    
Long-term average crude oil price (Brent) 88.02 93.24 70.09
Long-term average ethane price | $ / gal 0.4233 0.4315 0.3718
Long-term average ammonia price | R / T 9,046.19 10,173.00 5,297.00
Long-term average refining margin 12.34 12.23 9.67
Long-term average exchange rate | R / $ 17.40 15.95 14.57
Future oil price period (in years) 5 years 5 years 5 years
Future ammonia price period (in years) 5 years 5 years 5 years
Future exchange rate period (in years) 5 years 5 years 5 years
Future ethane price period (in years) 10 years 10 years 10 years
South Africa      
Impairment assumptions      
Long-term average Southern African gas purchase price (real) | $ / kJ 0.00001093 0.00000894 0.00000841
Growth rate - long-term Producer Price Index 5.50% 5.50% 5.50%
Weighted average cost of capital 15.20% 14.41% 14.03%
United States      
Impairment assumptions      
Growth rate - long-term Producer Price Index 2.00% 2.00% 2.00%
Weighted average cost of capital 9.07% 8.13% 7.70%
Europe      
Impairment assumptions      
Growth rate - long-term Producer Price Index 2.00% 2.00% 2.00%
Europe | Minimum      
Impairment assumptions      
Weighted average cost of capital 9.07% 8.13% 7.70%
Europe | Maximum      
Impairment assumptions      
Weighted average cost of capital 10.68% 9.57% 9.05%