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Taxation - Reconciliation of effective tax rate (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Reconciliation of average effective tax rate and applicable tax rate [abstract]      
South African normal tax rate 28.00% 28.00% 28.00%
Increase in rate of tax due to - disallowed preference share dividends 0.90% 0.90% 1.20%
Increase in rate of tax due to - disallowed expenditure 4.20% 2.30% 4.30%
Increase in rate of tax due to - disallowed share-based payment expenses 5.30% 0.10% 0.20%
Increase in rate of tax due to - translation differences     1.10%
Increase in rate of tax due to - different tax rates 2.60% 0.30% 1.00%
Increase in rate of tax due to - effect of tax litigation matters   3.20%  
Increase in rate of tax due to - tax losses not recognised 9.30% 1.00% 13.10%
Increase in rate of tax due to - prior year adjustments 0.40%    
Increase in rate of tax due to - other adjustments 1.50% 0.40% 1.20%
Normal tax rate plus increase in tax rate 52.20% 36.20% 50.10%
Decrease in rate of tax due to - exempt income (4.20%) (0.40%) (0.80%)
Decrease in rate of tax due to - share of profits of equity accounted investments (2.60%) (1.00%) (0.60%)
Decrease in rate of tax due to - exempt income on reversal of EGTL provision     (2.70%)
Decrease in rate of tax due to - recognition of previously unrecognised deferred tax assets   (1.60%) (4.00%)
Decrease in rate of tax due to - utilisation of tax losses (0.40%)   (0.70%)
Decrease in rate of tax due to - investment incentive allowances (6.90%) (2.40%) (2.40%)
Decrease in rate of tax due to - effect of tax rate change in the US (1.40%)    
Decrease in rate of tax due to - translation differences (0.90%) (0.90%)  
Decrease in rate of tax due to - prior year adjustments   (1.40%) (1.90%)
Decrease in rate of tax due to - other adjustments (0.40%) (0.20%) (0.40%)
Effective tax rate 35.40% 28.30% 36.60%
Adjusted effective tax rate 27.30% 26.50% 28.20%
Increase in energy efficiency allowance R 300    
Canadian shale gas asset      
Reconciliation of average effective tax rate and applicable tax rate [abstract]      
Impairment loss 2,800    
Mozambique PSA      
Reconciliation of average effective tax rate and applicable tax rate [abstract]      
Impairment loss R 1,100