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Financial risk management - Summary of Derivative Contracts (Details) ton in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) ton | Dec. 31, 2016 USD ($) ton
Disclosure of detailed information about financial instruments [line items] |  |
Tons of biological asset | ton | 347,451 | 163,755
Notional amount | $ 130,069 | $ 62,424
Fair Value Asset/ (Liability) | 3,965 | 1,593
Loss/(Gain) | $ 3,336 | $ (2,297)
Corn | Futures |  |
Disclosure of detailed information about financial instruments [line items] |  |
Tons of biological asset | ton | (33) | 66
Notional amount | $ (3,198) | $ 9,436
Fair Value Asset/ (Liability) | 48 | 46
Loss/(Gain) | $ 361 | $ 46
Soybean | Futures |  |
Disclosure of detailed information about financial instruments [line items] |  |
Tons of biological asset | ton | 83 | 120
Notional amount | $ 19,195 | $ 42,330
Fair Value Asset/ (Liability) | 670 | (1,171)
Loss/(Gain) | $ (765) | $ (1,170)
Soybean | Buy put |  |
Disclosure of detailed information about financial instruments [line items] |  |
Tons of biological asset | ton |  | 14
Notional amount |  | $ 464
Fair Value Asset/ (Liability) |  | 644
Loss/(Gain) |  | $ 181
Sugar | Futures |  |
Disclosure of detailed information about financial instruments [line items] |  |
Tons of biological asset | ton | 343,874 | 17,020
Notional amount | $ 121,072 | $ 9,144
Fair Value Asset/ (Liability) | 3,231 | 722
Loss/(Gain) | $ 3,808 | $ 64
Sugar | Buy put |  |
Disclosure of detailed information about financial instruments [line items] |  |
Tons of biological asset | ton |  | 70,510
Notional amount |  | $ (6,734)
Fair Value Asset/ (Liability) |  | 5,374
Loss/(Gain) |  | $ 352
Sugar | Sell call |  |
Disclosure of detailed information about financial instruments [line items] |  |
Tons of biological asset | ton |  | 54,597
Notional amount |  | $ 3,058
Fair Value Asset/ (Liability) |  | (3,219)
Loss/(Gain) |  | $ (105)
Sugar | Sell put |  |
Disclosure of detailed information about financial instruments [line items] |  |
Tons of biological asset | ton | 3,572 | 14,528
Notional amount | $ 83 | $ 748
Fair Value Asset/ (Liability) | 54 | (763)
Loss/(Gain) | $ (30) | $ (1,625)
Ethanol | Futures |  |
Disclosure of detailed information about financial instruments [line items] |  |
Tons of biological asset | ton |  | 6,900
Notional amount |  | $ 3,978
Fair Value Asset/ (Liability) |  | (40)
Loss/(Gain) |  | $ (40)
Wheat | Futures |  |
Disclosure of detailed information about financial instruments [line items] |  |
Tons of biological asset | ton | (45) |
Notional amount | $ (7,083) |
Fair Value Asset/ (Liability) | (38) |
Loss/(Gain) | $ (38) |

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- Definition Derivative Financial Assets (Liabilities), Excluding Foreign Currency + References No definition available. + Details
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- Definition Tons of Biological Asset + References No definition available. + Details
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- Definition The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_85&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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