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Cost of Sales - Narrative (Details) | 12 Months Ended
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Jun. 30, 2019 ZAR (R) shares | Jun. 30, 2018 ZAR (R) | Jun. 30, 2017 ZAR (R)
Disclosure Of Cost Of Sales [Line Items] |  |  |
Production costs | R 20,324,000,000 | R 15,084,000,000 | R 15,042,000,000
Rehabilitation spend | 86,000,000 | 94,000,000 | 96,000,000
Employment termination and restructuring costs | 242,000,000 | 208,000,000 | 74,000,000
Reversal of impairment loss | 0 | 0 | 0
Moab Khotsong |  |  |
Disclosure Of Cost Of Sales [Line Items] |  |  |
Change in production costs | 2,400,000,000 |  |
Production costs |  | 1,000,000,000 |
Change in amortisation and depreciation of mining assets | 178,000,000 |  |
Hidden Valley |  |  |
Disclosure Of Cost Of Sales [Line Items] |  |  |
Change in production costs | 1,600,000,000 | R (1,200,000,000) |
Change in amortisation and depreciation of mining assets | 1,600,000,000 |  |
Employment termination and restructuring costs |  |  | R 61,000,000
Target 1 |  |  |
Disclosure Of Cost Of Sales [Line Items] |  |  |
Change in amortisation and depreciation of mining assets | (199,000,000) |  |
Unisel and Masimong |  |  |
Disclosure Of Cost Of Sales [Line Items] |  |  |
Change in amortisation and depreciation of mining assets | R (184,000,000) |  |
2006 share plan |  |  |
Disclosure Of Cost Of Sales [Line Items] |  |  |
Options granted (in shares) | shares | 0 |  |

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