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Material accounting estimates and judgments - Allocated Goodwill to CGUs in Brazil (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Disclosure of information for cash-generating units [line items]        
Total assets allocated to CGUs tested $ 3,164,894   $ 3,108,855  
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)   $ 3,171   $ 2,937
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)   1,189   1,102
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) $ 4,500 4,360   4,039
Closing net book value of PPE items allocated to CGUs tested   600,764   518,814
Total assets allocated to CGUs tested   $ 605,124   $ 522,853