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Financial risk management and financial instruments - Sensitivity (Details) R in Millions, $ in Millions | 12 Months Ended |
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Jun. 30, 2024 ZAR (R) $ / shares R / $ R / shares | Jun. 30, 2023 ZAR (R) R / $ R / shares $ / shares | Jun. 30, 2022 ZAR (R) | Nov. 08, 2022 USD ($)
Disclosure of financial instruments |  |  |  |
Unrealised fair value loss recognised in other operating expenses and income | R (2,364) | R (3,287) | R 18,325 |
US Dollar Convertible Bond, November 2027 |  |  |  |
Disclosure of financial instruments |  |  |  |
Contract amount | $ |  |  |  | $ 750
Oxygen supply contract embedded derivative assets and liabilities |  |  |  |
Disclosure of financial instruments |  |  |  |
Balance at the beginning of the year | 477 | (339) |  |
Amounts settled during the year | (1) | 22 |  |
Unrealised fair value loss recognised in other operating expenses and income | (442) | 794 | (64) |
Balance at the end of the year | R 34 | R 477 | R (339) |
Oxygen supply contract embedded derivative assets and liabilities | Rand/USD spot price |  |  |  |
Disclosure of financial instruments |  |  |  |
Significant inputs liabilities | R / $ | 18.19 | 18.76 |  |
Increase in price or rate assumption | R / $ | 1 | 1 |  |
Decrease in price or rate assumption | R / $ | (1) | (1) |  |
Increase/(decrease) in profit or loss and equity from increase in significant input variable | R (478) | R (478) |  |
Increase/(decrease) in profit or loss and equity from decrease in significant input variable | R 478 | R 478 |  |
Oxygen supply contract embedded derivative assets and liabilities | US$ Swap curve |  |  |  |
Disclosure of financial instruments |  |  |  |
Increase in significant input variable (as a percent) | 0.10% | 0.10% |  |
Decrease in significant input variable (as a percent) | (0.10%) | (0.10%) |  |
Increase/(decrease) in profit or loss and equity from increase in significant input variable | R 81 | R 87 |  |
Increase/(decrease) in profit or loss and equity from decrease in significant input variable | R (82) | R (89) |  |
Oxygen supply contract embedded derivative assets and liabilities | US$ Swap curve | Minimum |  |  |  |
Disclosure of financial instruments |  |  |  |
Significant inputs liabilities | 0.0363 | 0.0330 |  |
Oxygen supply contract embedded derivative assets and liabilities | US$ Swap curve | Maximum |  |  |  |
Disclosure of financial instruments |  |  |  |
Significant inputs liabilities | 0.0506 | 0.0560 |  |
Oxygen supply contract embedded derivative assets and liabilities | Rand Swap curve |  |  |  |
Disclosure of financial instruments |  |  |  |
Increase in significant input variable (as a percent) | 1.00% | 1.00% |  |
Decrease in significant input variable (as a percent) | (1.00%) | (1.00%) |  |
Increase/(decrease) in profit or loss and equity from increase in significant input variable | R (688) | R (734) |  |
Increase/(decrease) in profit or loss and equity from decrease in significant input variable | R 784 | R 848 |  |
Oxygen supply contract embedded derivative assets and liabilities | Rand Swap curve | Minimum |  |  |  |
Disclosure of financial instruments |  |  |  |
Significant inputs liabilities | 0.0776 | 0.0836 |  |
Oxygen supply contract embedded derivative assets and liabilities | Rand Swap curve | Maximum |  |  |  |
Disclosure of financial instruments |  |  |  |
Significant inputs liabilities | 0.1035 | 0.1041 |  |
Convertible bond embedded derivative liability |  |  |  |
Disclosure of financial instruments |  |  |  |
Balance at the beginning of the year | R 1,302 |  |  |
Recognition of embedded derivative upon issue of bond |  | R 2,089 |  |
Unrealised fair value loss recognised in other operating expenses and income | (1,233) | (867) |  |
Translation of foreign operations | (10) | 80 |  |
Balance at the end of the year | R 59 | R 1,302 |  |
Convertible bond embedded derivative liability | Rand/USD spot price |  |  |  |
Disclosure of financial instruments |  |  |  |
Significant inputs liabilities | R / $ | 18.19 | 18.83 |  |
Convertible bond embedded derivative liability | Conversion price |  |  |  |
Disclosure of financial instruments |  |  |  |
Significant inputs liabilities | $ / shares | 18.79 | 19.86 |  |
Convertible bond embedded derivative liability | Spot share price |  |  |  |
Disclosure of financial instruments |  |  |  |
Significant inputs liabilities | R / shares | 138.10 | 233.26 |  |
Convertible bond embedded derivative liability | Observable bond market price |  |  |  |
Disclosure of financial instruments |  |  |  |
Significant inputs liabilities | 0.9042 | 0.947 |  |
Convertible bond embedded derivative liability | Credit spread |  |  |  |
Disclosure of financial instruments |  |  |  |
Significant inputs liabilities | 0.0372 | 0.0460 |  |
Increase in significant input variable (as a percent) | 1.00% | 1.00% |  |
Decrease in significant input variable (as a percent) | (1.00%) | (1.00%) |  |
Increase/(decrease) in profit or loss and equity from increase in significant input variable | R (364) | R (433) |  |
Increase/(decrease) in profit or loss and equity from decrease in significant input variable | R 59 | R 455 |  |
Convertible bond embedded derivative liability | Volatility |  |  |  |
Disclosure of financial instruments |  |  |  |
Significant inputs liabilities | 0.2139 | 0.2784 |  |
Increase in significant input variable (as a percent) | 5.00% | 5.00% |  |
Decrease in significant input variable (as a percent) | (5.00%) | (5.00%) |  |
Increase/(decrease) in profit or loss and equity from increase in significant input variable | R (81) | R (377) |  |
Increase/(decrease) in profit or loss and equity from decrease in significant input variable | R 45 | R 364 |  |

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