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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, 2025 ZAR (R) R / $ R / shares $ / shares | Jun. 30, 2024 ZAR (R) R / $ R / shares $ / shares | Jun. 30, 2023 ZAR (R) | Nov. 08, 2022 USD ($)
Disclosure of financial instruments |  |  |  |
Unrealised fair value gain recognised in other expenses and income in operating profit | R (2,003) | R (2,364) | R (3,287) |
US Dollar Convertible Bond, November 2027 |  |  |  |
Disclosure of financial instruments |  |  |  |
Contract amount | $ |  |  |  | $ 750
Other receivable - Contingent consideration from disposal of Uzbekistan GTL LLC |  |  |  |
Disclosure of financial instruments |  |  |  |
Amounts recognised in remeasurement items affecting operating income | 1,436 |  |  |
Balance at the end of the year | R 1,436 |  |  |
Other receivable - Contingent consideration from disposal of Uzbekistan GTL LLC | Non-performance and country risk |  |  |  |
Disclosure of financial instruments |  |  |  |
Increase in significant input variable (as a percent) | 1.00% |  |  |
Decrease in significant input variable (as a percent) | (1.00%) |  |  |
Other receivable - Contingent consideration from disposal of Uzbekistan GTL LLC | Non-performance and country risk | Minimum |  |  |  |
Disclosure of financial instruments |  |  |  |
Fair value resulting from change in inputs | R 1,412 |  |  |
Other receivable - Contingent consideration from disposal of Uzbekistan GTL LLC | Non-performance and country risk | Maximum |  |  |  |
Disclosure of financial instruments |  |  |  |
Fair value resulting from change in inputs | R 1,444 |  |  |
Other receivable - Contingent consideration from disposal of Uzbekistan GTL LLC | Non-performance risk |  |  |  |
Disclosure of financial instruments |  |  |  |
Significant inputs | 0.0587 |  |  |
Other receivable - Contingent consideration from disposal of Uzbekistan GTL LLC | Country risk |  |  |  |
Disclosure of financial instruments |  |  |  |
Significant inputs | 0.0423 |  |  |
Oxygen supply contract embedded derivative assets and liabilities |  |  |  |
Disclosure of financial instruments |  |  |  |
Balance at the beginning of the year | R 34 | 477 |  |
Amounts settled during the year | 41 | (1) |  |
Unrealised fair value gain recognised in other expenses and income in operating profit | (924) | (442) | 794 |
Balance at the end of the year | R (849) | R 34 | 477 |
Oxygen supply contract embedded derivative assets and liabilities | Rand/USD spot price |  |  |  |
Disclosure of financial instruments |  |  |  |
Significant inputs | R / $ | 17.75 | 18.19 |  |
Increase in price or rate assumption | R / $ | 1 | 1 |  |
Decrease in price or rate assumption | R / $ | (1) | (1) |  |
Increase/(decrease) in profit or loss from increase in significant input variable | R (469) | R (478) |  |
Increase/(decrease) in profit or loss from decrease in significant input variable | R 469 | 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 from increase in significant input variable | R 73 | R 81 |  |
Increase/(decrease) in profit or loss from decrease in significant input variable | R (74) | R (82) |  |
Oxygen supply contract embedded derivative assets and liabilities | US$ Swap curve | Minimum |  |  |  |
Disclosure of financial instruments |  |  |  |
Significant inputs | 0.0342 | 0.0363 |  |
Oxygen supply contract embedded derivative assets and liabilities | US$ Swap curve | Maximum |  |  |  |
Disclosure of financial instruments |  |  |  |
Significant inputs | 0.0407 | 0.0506 |  |
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 from increase in significant input variable | R (699) | R (688) |  |
Increase/(decrease) in profit or loss from decrease in significant input variable | R 791 | R 784 |  |
Oxygen supply contract embedded derivative assets and liabilities | Rand Swap curve | Minimum |  |  |  |
Disclosure of financial instruments |  |  |  |
Significant inputs | 0.0694 | 0.0776 |  |
Oxygen supply contract embedded derivative assets and liabilities | Rand Swap curve | Maximum |  |  |  |
Disclosure of financial instruments |  |  |  |
Significant inputs | 0.1007 | 0.1035 |  |
Convertible bond embedded derivative liability |  |  |  |
Disclosure of financial instruments |  |  |  |
Balance at the beginning of the year | R 59 | R 1,302 |  |
Unrealised fair value gain recognised in other expenses and income in operating profit | (52) | (1,233) | (867) |
Translation of foreign operations |  | (10) |  |
Balance at the end of the year | R 7 | R 59 | R 1,302 |
Convertible bond embedded derivative liability | Rand/USD spot price |  |  |  |
Disclosure of financial instruments |  |  |  |
Significant inputs | R / $ | 17.75 | 18.19 |  |
Convertible bond embedded derivative liability | Conversion price |  |  |  |
Disclosure of financial instruments |  |  |  |
Significant inputs | $ / shares | 18.79 | 18.79 |  |
Convertible bond embedded derivative liability | Spot share price |  |  |  |
Disclosure of financial instruments |  |  |  |
Significant inputs | R / shares | 78.76 | 138.1 |  |
Convertible bond embedded derivative liability | Observable bond market price |  |  |  |
Disclosure of financial instruments |  |  |  |
Significant inputs | 0.9217 | 0.9042 |  |
Convertible bond embedded derivative liability | Credit spread |  |  |  |
Disclosure of financial instruments |  |  |  |
Significant inputs | 0.0485 | 0.0372 |  |
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 from increase in significant input variable | R (261) | R (364) |  |
Increase/(decrease) in profit or loss from decrease in significant input variable | R 7 | R 59 |  |
Convertible bond embedded derivative liability | Volatility |  |  |  |
Disclosure of financial instruments |  |  |  |
Significant inputs | 0.34 | 0.2139 |  |
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 from increase in significant input variable | R (12) | R (81) |  |
Increase/(decrease) in profit or loss from decrease in significant input variable | R 6 | R 45 |  |

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