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Financial Instruments and Derivatives - Net Positions of Other Derivatives Contract (Details) - Mar. 31, 2019 - Derivatives Not Designated as Hedging Instruments
R in Thousands, $ in Thousands, $ in Thousands, $ in Thousands
COP ($)
MXN ($)
CAD ($)
ZAR (R)
purchase        
Derivative [Line Items]        
Net position $ 9,199,944 $ 420,776 $ 21,475  
sell        
Derivative [Line Items]        
Net position       R 8,261