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INCOME TAX EXPENSE - Narrative (Details) - ZAR (R)
R in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Income tax [abstract]      
Increase in effective tax rate 1.00%    
Increase in net deferred liability R 14.2 R 10.3 R 8.6
Applicable tax rate nonmining income 28.00%    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Forecast weighted average deferred tax rate 25.00%    
Disclosure of non-deductible epenses [abstract]      
Net Operating Cost, Non Deductible For Tax   14.6 11.3
Discount recognised on Payments made under protest R 7.4 7.1 6.5
Expenditure not incurred in generation of taxable income 17.0 2.7 6.0
Depreciation of property, plant and equipment exempt from deferred tax on initial recognition R 21.2 R 21.4 R 4.9
South African corporate tax rate 28.00% 28.00% 28.00%
Dividends received R 76.1 R 4.3  
Unwinding recognised on Payments made under protest 4.8 R 3.9 R 3.0
Net operating income non taxable R 1.0    
FWGR [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Forecast weighted average deferred tax rate 30.00% 30.00% 30.00%
Disclosure of non-deductible epenses [abstract]      
Depreciation of property, plant and equipment exempt from deferred tax on initial recognition R 68.7 R 73.2 R 16.6
Percentage decrease [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Forecast weighted average deferred tax rate   22.00% 20.30%
Disclosure of non-deductible epenses [abstract]      
South African corporate tax rate 27.00%    
Percentage increase [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Forecast weighted average deferred tax rate   25.00% 22.00%
Disclosure of non-deductible epenses [abstract]      
South African corporate tax rate 28.00%