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DERIVATIVES AND RISK MANAGEMENT (Non-designated Hedges) (Details) - Sep. 30, 2017 - Forward Contracts - Forward contracts not designated as hedging instruments ZAR in Millions, $ in Millions | USD ($) | ZAR
--- | --- | ---
Derivative [Line Items] |  |
Fair value of designated forward contracts | $ | $ 2.2 |
Hedged amount | ZAR |  | ZAR 28.3

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