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Critical accounting estimates and judgments - Narrative (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
cash_generating_unit
Dec. 31, 2019
USD ($)
 [1]
Sep. 30, 2019
USD ($)
cash_generating_unit
Disclosure of information for cash-generating units [line items]        
Number of cash-generating units | cash_generating_unit   40   40
Total assets allocated to CGUs tested $ 2,482,236   $ 2,521,307  
Argentina | Cash-generating units        
Disclosure of information for cash-generating units [line items]        
Total assets allocated to CGUs tested 147,000 $ 175,050   $ 176,438
Brazil        
Disclosure of information for cash-generating units [line items]        
Number of cash-generating units | cash_generating_unit   2   2
Brazil | Cash-generating units        
Disclosure of information for cash-generating units [line items]        
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.