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Financial Instruments - Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Sep. 30, 2021
Derivatives Fair Value [Line Items]    
Net financial instruments, assets $ 141,552 $ 230,686
Net financial instruments, liabilities (21,634) (5,269)
Designated As Hedges:    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 129,420 169,469
Gross financial instruments, liabilities (20,048) 0
Designated As Hedges: | Other current assets | Interest rate contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 61,867  
Designated As Hedges: | Other current liabilities | Interest rate contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, liabilities (3,439)  
Designated As Hedges: | Deferred charges and other assets | Interest rate contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 67,553 169,469
Designated As Hedges: | Deferred credits and other liabilities | Interest rate contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, liabilities (16,609) 0
Not Designated As Hedges:    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 12,132 61,217
Gross financial instruments, liabilities (1,586) (5,269)
Not Designated As Hedges: | Other current assets | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 10,342 55,073
Not Designated As Hedges: | Other current liabilities | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, liabilities (1,572) (5,269)
Not Designated As Hedges: | Deferred charges and other assets | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 1,790 6,144
Not Designated As Hedges: | Deferred credits and other liabilities | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, liabilities $ (14) $ 0