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Financial instruments - Financial assets and liabilities measured at fair value (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Jun. 30, 2022
Assets:    
Equity securities $ 432 $ 13,038
Derivatives 132,845 42,771
Liabilities:    
Derivatives 71,282 1,022,655
Quoted Prices In Active Markets (Level 1)    
Assets:    
Equity securities 432 13,038
Derivatives 0 0
Liabilities:    
Derivatives 0 0
Significant Other Observable Inputs (Level 2)    
Assets:    
Equity securities 0 0
Derivatives 132,845 42,771
Liabilities:    
Derivatives 71,282 1,022,655
Significant Unobservable Inputs (Level 3)    
Assets:    
Equity securities 0 0
Derivatives 0 0
Liabilities:    
Derivatives $ 0 $ 0