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Fair Value Of Financial Instruments (Schedule Of Key Valuation Inputs Used To Measure Fair Value Of Investment In Cell C) (Details) - Cell C [Member] R in Billions, $ in Billions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 USD ($) | Jun. 30, 2025 USD ($) | Sep. 30, 2025 ZAR (R) | Jun. 30, 2025 ZAR (R)
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Net adjusted external debt | $ 0.5 | $ 0.5 | R 8.8 | R 8.3
Weighted Average Cost of Capital (WACC) Rate [Member] |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investment fair value measurement inputs | 23.00% | 24.00% |  |
Long Term Growth Rate [Member] |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investment fair value measurement inputs | 4.50% | 4.50% |  |
Marketability Discount [Member] |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investment fair value measurement inputs | 15.00% | 15.00% |  |
Minority Discount [Member] |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investment fair value measurement inputs | 17.00% | 17.00% |  |

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