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Financial instruments - Fair values based on recognized valuation methods (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
Level 1 | Futures  
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]  
Derivative financial assets (liabilities) $ 855
Level 1 | OTC  
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]  
Derivative financial assets (liabilities) (232)
Level 1 | NDF  
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]  
Derivative financial assets (liabilities) (66)
Level 1 | Public securities  
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]  
Derivative financial assets (liabilities) 25,464
Level 2 | Interest-rate swaps  
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]  
Derivative financial assets (liabilities) $ 9,408