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Share Capital - Narrative (Details) - ZAR (R) R / shares in Units, R in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 20, 2019 | Jul. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 15, 2019
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Additional capital authorised |  |  | R 1,260 |  |  |
Ordinary share capital issued (as a percent) |  |  | 15.00% |  |  |
Shares issued and fully paid (in shares) |  |  | 55,055,050 |  |  |
Shares issued price per share (in rand per share) |  |  | R 19.12 |  |  |
Proceeds from issuing shares |  | R 211 | R 1,050 |  |  |
Share issue related cost |  |  | R 49 |  |  |
Shares issued relating to exercise of share options (in shares) |  |  |  | 21,856,821 | 5,239,502 |
Ordinary shares |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Number of shares authorised (in shares) |  |  | 1,200,000,000 | 1,200,000,000 | 1,200,000,000 |
Number of shares issued and fully paid (in shares) |  |  | 500,251,751 | 539,841,195 | 500,251,751 |
Convertible preference shares |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Number of shares authorised (in shares) |  |  | 4,400,000 | 4,400,000 | 4,400,000 |
Number of shares issued and fully paid (in shares) |  |  | 0 | 4,400,000 | 0 |
ARM |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Shares issued and fully paid (in shares) |  | 11,032,623 |  |  |  |
Shares issued price per share (in rand per share) |  | R 19.12 |  |  |  |
Ownership interest (as a percent) |  | 14.29% |  | 13.80% |  |
Harmony ESOP Trust | Share trust controlled by entity |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Number of shares in entity held by entity or by its subsidiaries or associates (in shares) |  |  |  |  |  | 6,700,000
Harmony ESOP Trust | Share trust controlled by entity | Ordinary shares |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Number of shares in entity held by entity or by its subsidiaries or associates (in shares) |  |  | 0 | 6,592,900 | 0 |
Harmony Gold Community Trust | Share trust controlled by entity |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Minimum annual preference dividend (in rand per share) | R 2 |  |  |  |  |
Ordinary shares issued upon conversion of convertible preference shares (in shares) | 1 |  |  |  |  |
Harmony Gold Community Trust | Share trust controlled by entity | Convertible preference shares |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Number of shares in entity held by entity or by its subsidiaries or associates (in shares) | 4,400,000 |  | 0 | 4,400,000 | 0 |

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