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Critical accounting estimates and judgments - Allocated Goodwill to CGUs in Argentina (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Disclosure of information for cash-generating units [line items]        
Total assets allocated to CGUs tested $ 2,521,307   $ 2,277,372  
Argentina | La Carolina | Crops        
Disclosure of information for cash-generating units [line items]        
Closing net book value of goodwill allocated to CGUs tested (Note 15)   $ 162   $ 112
Argentina | La Carolina | Cattle        
Disclosure of information for cash-generating units [line items]        
Closing net book value of goodwill allocated to CGUs tested (Note 15)   26   38
Argentina | El Orden | Crops        
Disclosure of information for cash-generating units [line items]        
Closing net book value of goodwill allocated to CGUs tested (Note 15)   175   170
Argentina | El Orden | Cattle        
Disclosure of information for cash-generating units [line items]        
Closing net book value of goodwill allocated to CGUs tested (Note 15)   6   14
Argentina | La Guarida | Crops        
Disclosure of information for cash-generating units [line items]        
Closing net book value of goodwill allocated to CGUs tested (Note 15)   1,158   1,149
Argentina | La Guarida | Cattle        
Disclosure of information for cash-generating units [line items]        
Closing net book value of goodwill allocated to CGUs tested (Note 15)   597   937
Argentina | Los Guayacanes | Crops        
Disclosure of information for cash-generating units [line items]        
Closing net book value of goodwill allocated to CGUs tested (Note 15)   2,145   1,449
Argentina | Dona Marina | Rice        
Disclosure of information for cash-generating units [line items]        
Closing net book value of goodwill allocated to CGUs tested (Note 15)   3,734   3,385
Argentina | Huelen | Crops        
Disclosure of information for cash-generating units [line items]        
Closing net book value of goodwill allocated to CGUs tested (Note 15)   3,716   3,369
Argentina | El Colorado | Crops        
Disclosure of information for cash-generating units [line items]        
Closing net book value of goodwill allocated to CGUs tested (Note 15)   1,857   1,484
Argentina | El Colorado | Cattle        
Disclosure of information for cash-generating units [line items]        
Closing net book value of goodwill allocated to CGUs tested (Note 15)   18   216
Argentina | Cash-generating units        
Disclosure of information for cash-generating units [line items]        
Closing net book value of goodwill allocated to CGUs tested (Note 15)   13,594   12,323
Closing net book value of PPE items allocated to CGUs tested   162,844   179,545
Total assets allocated to CGUs tested $ 176,000 $ 176,438   $ 191,868