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INCOME TAX EXPENSE - Narrative (Details) - ZAR (R) R in Millions | 12 Months Ended
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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% |  |

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