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Critical accounting estimates and judgments - Allocated Goodwill to CGUs in Brazil (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  
Sugar, Ethanol and Energy | AVI        
Disclosure of information for cash-generating units [line items]        
Closing net book value of goodwill allocated to CGUs tested (Note 15)   $ 3,813   $ 3,966
Sugar, Ethanol and Energy | UMA        
Disclosure of information for cash-generating units [line items]        
Closing net book value of goodwill allocated to CGUs tested (Note 15)   1,430   2,107
Brazil | Cash-generating units        
Disclosure of information for cash-generating units [line items]        
Closing net book value of goodwill allocated to CGUs tested (Note 15)   5,243   6,073
Closing net book value of PPE items allocated to CGUs tested   614,702   618,818
Total assets allocated to CGUs tested $ 652,000 $ 619,945   $ 624,891