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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