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Other Non-Current Assets - Schedule of Other Non-Current Assets (Details) - ZAR (R) R in Millions | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Disclosure of financial assets [line items] |  |  |  |  |
Debt instruments |  | R 274 | R 253 |  |
Loans to associates |  | 116 | 116 |  |
Other loans |  | 3 | 0 |  |
Equity instruments |  | 59 | 8 |  |
Other non-current assets |  | 1 | 3 |  |
Total other non-current assets |  | R 334 | 264 |  |
Subordinated And Unsecured Loan To ARM BBEE Trust | JIBAR |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Interest rate margin (as a percent) |  | 4.25% |  |  |
ARM |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Ownership interest (as a percent) | 14.29% | 13.80% |  |  |
ARM BBEE Trust |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Loan to ARM BBEE Trust |  | R 271 |  |  |
Loan to ARM BBEE Trust |  |  | 256 |  | R 200
Pamodzi |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Loans to associates |  | 116 | 116 |  |
Rand Mutual Assurance |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Equity instruments |  | 52 | 0 | R 0 |
Other investments |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Equity instruments |  | 7 | 8 |  |
Debt instrument |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Loss allowance |  | R (116) | R (119) | R (162) |

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