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Derivative Financial Instruments - Disclosure of Open Position at the Reporting Date (Details) R / kg in Thousands, $ in Millions | Jun. 30, 2019 USD ($) R / $ R / kg $ / oz oz
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R/gold | Cash flow hedges |
Disclosure of detailed information about financial instruments [line items] |
Nominal amount of hedging instrument (oz) | 588,000
R/gold | Cash flow hedges | FY20 Q1 |
Disclosure of detailed information about financial instruments [line items] |
Nominal amount of hedging instrument (oz) | 76,000
R/gold | Cash flow hedges | FY20 Q2 |
Disclosure of detailed information about financial instruments [line items] |
Nominal amount of hedging instrument (oz) | 80,000
R/gold | Cash flow hedges | FY20 Q3 |
Disclosure of detailed information about financial instruments [line items] |
Nominal amount of hedging instrument (oz) | 88,000
R/gold | Cash flow hedges | FY20 Q4 |
Disclosure of detailed information about financial instruments [line items] |
Nominal amount of hedging instrument (oz) | 96,000
R/gold | Cash flow hedges | FY21 Q1 |
Disclosure of detailed information about financial instruments [line items] |
Nominal amount of hedging instrument (oz) | 71,000
R/gold | Cash flow hedges | FY21 Q2 |
Disclosure of detailed information about financial instruments [line items] |
Nominal amount of hedging instrument (oz) | 71,000
R/gold | Cash flow hedges | FY21 Q3 |
Disclosure of detailed information about financial instruments [line items] |
Nominal amount of hedging instrument (oz) | 73,000
R/gold | Cash flow hedges | FY21 Q4 |
Disclosure of detailed information about financial instruments [line items] |
Nominal amount of hedging instrument (oz) | 33,000
US$/gold | Cash flow hedges |
Disclosure of detailed information about financial instruments [line items] |
Nominal amount of hedging instrument (oz) | 56,000
US$/gold | Cash flow hedges | FY20 Q1 |
Disclosure of detailed information about financial instruments [line items] |
Nominal amount of hedging instrument (oz) | 6,000
US$/gold | Cash flow hedges | FY20 Q2 |
Disclosure of detailed information about financial instruments [line items] |
Nominal amount of hedging instrument (oz) | 8,000
US$/gold | Cash flow hedges | FY20 Q3 |
Disclosure of detailed information about financial instruments [line items] |
Nominal amount of hedging instrument (oz) | 12,000
US$/gold | Cash flow hedges | FY20 Q4 |
Disclosure of detailed information about financial instruments [line items] |
Nominal amount of hedging instrument (oz) | 12,000
US$/gold | Cash flow hedges | FY21 Q1 |
Disclosure of detailed information about financial instruments [line items] |
Nominal amount of hedging instrument (oz) | 8,000
US$/gold | Cash flow hedges | FY21 Q2 |
Disclosure of detailed information about financial instruments [line items] |
Nominal amount of hedging instrument (oz) | 6,000
US$/gold | Cash flow hedges | FY21 Q3 |
Disclosure of detailed information about financial instruments [line items] |
Nominal amount of hedging instrument (oz) | 3,000
US$/gold | Cash flow hedges | FY21 Q4 |
Disclosure of detailed information about financial instruments [line items] |
Nominal amount of hedging instrument (oz) | 1,000
Zero cost collars |
Disclosure of detailed information about financial instruments [line items] |
Derivative, notional amount | $ | $ 414
Zero cost collars | Floor |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | R / $ | 14.92
Zero cost collars | Cap |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | R / $ | 15.74
Zero cost collars | FY20 Q1 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, notional amount | $ | $ 71
Zero cost collars | FY20 Q1 | Floor |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | R / $ | 14.48
Zero cost collars | FY20 Q1 | Cap |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | R / $ | 15.19
Zero cost collars | FY20 Q2 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, notional amount | $ | $ 69
Zero cost collars | FY20 Q2 | Floor |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | R / $ | 14.59
Zero cost collars | FY20 Q2 | Cap |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | R / $ | 15.35
Zero cost collars | FY20 Q3 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, notional amount | $ | $ 64
Zero cost collars | FY20 Q3 | Floor |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | R / $ | 14.80
Zero cost collars | FY20 Q3 | Cap |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | R / $ | 15.57
Zero cost collars | FY20 Q4 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, notional amount | $ | $ 62
Zero cost collars | FY20 Q4 | Floor |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | R / $ | 14.96
Zero cost collars | FY20 Q4 | Cap |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | R / $ | 15.75
Zero cost collars | FY21 Q1 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, notional amount | $ | $ 49
Zero cost collars | FY21 Q1 | Floor |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | R / $ | 15.30
Zero cost collars | FY21 Q1 | Cap |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | R / $ | 16.11
Zero cost collars | FY21 Q2 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, notional amount | $ | $ 48
Zero cost collars | FY21 Q2 | Floor |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | R / $ | 15.28
Zero cost collars | FY21 Q2 | Cap |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | R / $ | 16.27
Zero cost collars | FY21 Q3 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, notional amount | $ | $ 37
Zero cost collars | FY21 Q3 | Floor |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | R / $ | 15.37
Zero cost collars | FY21 Q3 | Cap |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | R / $ | 16.36
Zero cost collars | FY21 Q4 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, notional amount | $ | $ 14
Zero cost collars | FY21 Q4 | Floor |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | R / $ | 15.55
Zero cost collars | FY21 Q4 | Cap |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | R / $ | 16.55
Forward contracts |
Disclosure of detailed information about financial instruments [line items] |
Derivative, notional amount | $ | $ 390
Price of derivative instrument at fair value through profit and loss | R / $ | 15.35
Forward contracts | FY20 Q1 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, notional amount | $ | $ 69
Price of derivative instrument at fair value through profit and loss | R / $ | 14.71
Forward contracts | FY20 Q2 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, notional amount | $ | $ 69
Price of derivative instrument at fair value through profit and loss | R / $ | 15.00
Forward contracts | FY20 Q3 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, notional amount | $ | $ 66
Price of derivative instrument at fair value through profit and loss | R / $ | 15.27
Forward contracts | FY20 Q4 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, notional amount | $ | $ 60
Price of derivative instrument at fair value through profit and loss | R / $ | 15.44
Forward contracts | FY21 Q1 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, notional amount | $ | $ 61
Price of derivative instrument at fair value through profit and loss | R / $ | 15.89
Forward contracts | FY21 Q2 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, notional amount | $ | $ 35
Price of derivative instrument at fair value through profit and loss | R / $ | 15.82
Forward contracts | FY21 Q3 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, notional amount | $ | $ 24
Price of derivative instrument at fair value through profit and loss | R / $ | 15.96
Forward contracts | FY21 Q4 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, notional amount | $ | $ 6
Price of derivative instrument at fair value through profit and loss | R / $ | 16.23
R/gold |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 39,000
Price of hedging instrument | R / kg | 659
R/gold | FY20 Q1 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 19,000
Price of hedging instrument | R / kg | 626
R/gold | FY20 Q2 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 14,000
Price of hedging instrument | R / kg | 641
R/gold | FY20 Q3 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 6,000
Price of hedging instrument | R / kg | 648
R/gold | FY20 Q4 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 0
Price of hedging instrument | R / kg | 661
R/gold | FY21 Q1 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 0
Price of hedging instrument | R / kg | 668
R/gold | FY21 Q2 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 0
Price of hedging instrument | R / kg | 674
R/gold | FY21 Q3 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 0
Price of hedging instrument | R / kg | 689
R/gold | FY21 Q4 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 0
Price of hedging instrument | R / kg | 702
US$/gold |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 10,000
Price of hedging instrument | $ / oz | 1,368
US$/gold | FY20 Q1 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 6,000
Price of hedging instrument | $ / oz | 1,351
US$/gold | FY20 Q2 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 4,000
Price of hedging instrument | $ / oz | 1,363
US$/gold | FY20 Q3 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 0
Price of hedging instrument | $ / oz | 1,357
US$/gold | FY20 Q4 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 0
Price of hedging instrument | $ / oz | 1,370
US$/gold | FY21 Q1 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 0
Price of hedging instrument | $ / oz | 1,376
US$/gold | FY21 Q2 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 0
Price of hedging instrument | $ / oz | 1,387
US$/gold | FY21 Q3 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 0
Price of hedging instrument | $ / oz | 1,404
US$/gold | FY21 Q4 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 0
Price of hedging instrument | $ / oz | 1,414
Total gold |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 693,000
Total gold | FY20 Q1 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 107,000
Total gold | FY20 Q2 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 106,000
Total gold | FY20 Q3 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 106,000
Total gold | FY20 Q4 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 108,000
Total gold | FY21 Q1 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 79,000
Total gold | FY21 Q2 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 77,000
Total gold | FY21 Q3 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 76,000
Total gold | FY21 Q4 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 34,000
US$/silver |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 90,000
US$/silver | Floor |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | $ / oz | 17.40
US$/silver | Cap |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | $ / oz | 18.40
US$/silver | FY20 Q1 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 90,000
US$/silver | FY20 Q1 | Floor |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | $ / oz | 17.40
US$/silver | FY20 Q1 | Cap |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | $ / oz | 18.40
US$/silver | FY20 Q2 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 0
US$/silver | FY20 Q2 | Floor |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | $ / oz | 0.00
US$/silver | FY20 Q2 | Cap |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | $ / oz | 0.00
US$/silver | FY20 Q3 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 0
US$/silver | FY20 Q3 | Floor |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | $ / oz | 0.00
US$/silver | FY20 Q3 | Cap |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | $ / oz | 0.00
US$/silver | FY20 Q4 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 0
US$/silver | FY20 Q4 | Floor |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | $ / oz | 0.00
US$/silver | FY20 Q4 | Cap |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | $ / oz | 0.00
US$/silver | FY21 Q1 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 0
US$/silver | FY21 Q1 | Floor |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | $ / oz | 0.00
US$/silver | FY21 Q1 | Cap |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | $ / oz | 0.00
US$/silver | FY21 Q2 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 0
US$/silver | FY21 Q2 | Floor |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | $ / oz | 0.00
US$/silver | FY21 Q2 | Cap |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | $ / oz | 0.00
US$/silver | FY21 Q3 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 0
US$/silver | FY21 Q3 | Floor |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | $ / oz | 0.00
US$/silver | FY21 Q3 | Cap |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | $ / oz | 0.00
US$/silver | FY21 Q4 |
Disclosure of detailed information about financial instruments [line items] |
Derivative, Nonmonetary Notional Amount | 0
US$/silver | FY21 Q4 | Floor |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | $ / oz | 0.00
US$/silver | FY21 Q4 | Cap |
Disclosure of detailed information about financial instruments [line items] |
Price of derivative instrument at fair value through profit and loss | $ / oz | 0.00

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