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Critical accounting estimates and judgments - Allocated Goodwill to CGUs in Brazil (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
 [1]
Sep. 30, 2019
Disclosure of information for cash-generating units [line items]        
Total assets allocated to CGUs tested $ 2,482,236   $ 2,521,307  
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)   $ 2,815   $ 3,813
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)   1,056   1,430
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)   3,871   5,243
Closing net book value of PPE items allocated to CGUs tested   494,077   614,702
Total assets allocated to CGUs tested $ 519,000 $ 497,948   $ 619,945
[1] Prior periods have been recast to reflect the Company's change in accounting policy for the reclassification within shareholders equity of the initial application of IAS 29 as explained in Note 34.1.