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DERIVATIVES AND RISK MANAGEMENT (Non-designated Hedges) (Details) R in Millions, $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Jul. 26, 2013 | Mar. 31, 2018 USD ($) | Mar. 31, 2018 ZAR (R)
Forward Contracts | Forward contracts not designated as hedging instruments |  |  |
Derivative [Line Items] |  |  |
Fair value of designated forward contracts | $ |  | $ 1.0 |
Hedged amount | R |  |  | R 14.0
Interest Rate Swaps | Designated as cash flow hedges |  |  |
Derivative [Line Items] |  |  |
Derivative, term of contract | 5 years |  |
Fixed interest rate (as a percent) |  | 1.288% | 1.288%
Applicable margin based on the Company's consolidated leverage ratio (as a percent) |  | 3.50% |

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