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Remeasurement Items affecting operating profit - Assumptions (Details)
 12 Months Ended
Jun. 30, 2019
R / $
$ / gal
$ / MMBTU
$ / bbl
R / T
Jun. 30, 2018
R / $
$ / gal
$ / MMBTU
$ / bbl
R / T
Jun. 30, 2017
R / $
$ / gal
$ / MMBTU
$ / bbl
R / T
Impairment assumptions      
Long-term average crude oil price (in USD/bbl) | $ / bbl 71.17 73.91 74.29
Long-term average gas price (Henry Hub), excluding margins (real) (in USD/mmbtu) | $ / MMBTU 3.44 3.49 3.69
Long-term average ethane price (nominal) (in US$/gal) | $ / gal 0.3904 0.3742 0.4427
Long-term average ammonia price (in Rand/ton) | R / T 4,258.54 5,807.46 6,392.85
Long-term average exchange rate (R/US$) | R / $ 14.29 13.57 14.71
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      
Growth rate - long-term producer price index 5.50% 5.50% 5.50%
Weighted average cost of capital 13.12% 12.71% 12.50%
Discount rate - risk adjusted 13.12% 12.71% 12.50%
United States of America      
Impairment assumptions      
Growth rate - long-term producer price index 2.00% 2.00% 2.00%
Weighted average cost of capital 7.18% 7.56% 6.60%
Discount rate - risk adjusted 7.18% 7.56% 6.60%
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 7.18% 7.68% 6.60%
Discount rate - risk adjusted 7.18% 7.68% 6.60%
Europe | Maximum      
Impairment assumptions      
Weighted average cost of capital 9.48% 9.35% 8.22%
Discount rate - risk adjusted 9.48% 9.35% 8.22%
Canada      
Impairment assumptions      
Growth rate - long-term producer price index 2.00% 2.00% 2.00%
Weighted average cost of capital 7.18% 7.68% 6.60%
Discount rate - risk adjusted 10.00% 10.00%  
Canada | Minimum      
Impairment assumptions      
Discount rate - risk adjusted     9.50%
Canada | Maximum      
Impairment assumptions      
Discount rate - risk adjusted     9.80%