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Remeasurement Items affecting operating profit - Assumptions (Details)
 12 Months Ended
Jun. 30, 2022
R / $
$ / bbl
R / T
$ / gal
$ / kJ
Jun. 30, 2021
R / $
$ / gal
R / T
$ / bbl
$ / kJ
Jun. 30, 2020
R / $
$ / bbl
$ / gal
R / T
$ / kJ
Impairment assumptions      
Long-term average crude oil price (Brent) (in USD/bbl) 93.24 70.09 59.69
Long-term average ethane price (in US$/gal) | $ / gal 0.4315 0.3718 0.3279
Long-term average ammonia price (in Rand/ton) | R / T 10,173.00 5,297.00 4,664.32
Long-term average refining margin (in US$/bbl) 12.23 9.67 9.43
Long-term average exchange rate (in Rand/US$) | R / $ 15.95 14.57 15.20
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
Minimum      
Impairment assumptions      
Period over which management has projected cash flows 5 years    
South Africa      
Impairment assumptions      
Long-term average Southern African gas purchase price (real) (in US$/Gj) | $ / kJ 0.0894 0.0841 0.0710
Growth rate - long-term Producer Price Index 5.50% 5.50% 5.50%
Weighted average cost of capital 14.41% 14.03% 14.22%
United States      
Impairment assumptions      
Growth rate - long-term Producer Price Index 2.00% 2.00% 2.00%
Weighted average cost of capital 8.13% 7.70% 7.66%
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 8.13% 7.70% 7.66%
Europe | Maximum      
Impairment assumptions      
Weighted average cost of capital 9.57% 9.05% 9.79%