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Critical accounting estimates and judgments - Summary of Allocated Goodwill to CGUs in Argentina and Uruguay (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | --- | --- | ---
Disclosure of information for cash-generating units [line items] |  |  |  |
Closing net book value of goodwill allocated to CGUs tested | $ 12,412 |  | $ 13,405 |
Total assets allocated to CGUs tested | 1,607,201 |  | 1,455,766 |
Argentina |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Closing net book value of goodwill allocated to CGUs tested | $ 5,095 |  | $ 5,980 |
Argentina | La Carolina | Crops |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Closing net book value of goodwill allocated to CGUs tested |  | $ 35 |  | $ 40
Argentina | La Carolina | Cattle |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Closing net book value of goodwill allocated to CGUs tested |  | 12 |  | 13
Argentina | El Orden | Crops |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Closing net book value of goodwill allocated to CGUs tested |  | 53 |  | 60
Argentina | El Orden | Cattle |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Closing net book value of goodwill allocated to CGUs tested |  | 4 |  | 5
Argentina | La Guarida | Crops |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Closing net book value of goodwill allocated to CGUs tested |  | 358 |  | 405
Argentina | La Guarida | Cattle |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Closing net book value of goodwill allocated to CGUs tested |  | 292 |  | 330
Argentina | Los Guayacanes | Crops |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Closing net book value of goodwill allocated to CGUs tested |  | 452 |  | 511
Argentina | Dona Marina | Rice |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Closing net book value of goodwill allocated to CGUs tested |  | 1,595 |  | 1,803
Argentina | Huelen | Crops |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Closing net book value of goodwill allocated to CGUs tested |  | 1,787 |  | 2,020
Argentina | El Colorado | Crops |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Closing net book value of goodwill allocated to CGUs tested |  | 787 |  | 890
Argentina | El Colorado | Cattle |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Closing net book value of goodwill allocated to CGUs tested |  | 115 |  | 130
Argentina | Cash-generating units |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Closing net book value of goodwill allocated to CGUs tested |  | 5,490 |  | 6,207
Argentina and Uruguay | Cash-generating units |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Closing net book value of PPE items and other assets allocated to CGUs tested |  | 34,668 |  | 36,901
Total assets allocated to CGUs tested |  | $ 40,158 |  | $ 43,108

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