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v3.20.2

Fair Value Of Financial Instruments (Schedule Of Key Valuation Inputs Used To Measure Fair Value Of Investment In Cell C) (Details) $ in Millions, R in Billions | 12 Months Ended |  |
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Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 ZAR (R) | Jun. 30, 2019 ZAR (R)
Deferred tax including assessed tax losses | $ 167.3 | $ 205.9 | R 2.9 | R 2.9
Weighted Average Cost of Capital (WACC) Rate [Member] | Minimum [Member] |  |  |  |
Investment fair value measurement inputs | 15.00% |  |  |
Weighted Average Cost of Capital (WACC) Rate [Member] | Maximum [Member] |  |  |  |
Investment fair value measurement inputs | 21.00% |  |  |
Cell C [Member] |  |  |  |
Net adjusted external debt | $ 900.0 | $ 1,000.0 | 15.8 | 13.9
Lease liabilities included in net adjusted external debt |  |  | R 4.4 | R 6.4
Cell C [Member] | Long Term Growth Rate [Member] | Minimum [Member] |  |  |  |
Investment fair value measurement inputs |  | 3.00% |  |
Cell C [Member] | Long Term Growth Rate [Member] | Maximum [Member] |  |  |  |
Investment fair value measurement inputs |  | 4.50% |  |
Cell C [Member] | Marketability Discount [Member] |  |  |  |
Investment fair value measurement inputs | 10.00% |  |  |
Cell C [Member] | Minority Discount [Member] |  |  |  |
Investment fair value measurement inputs | 15.00% |  |  |

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