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Financial Instruments - Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Sep. 30, 2021
Derivatives Fair Value [Line Items]    
Net financial instruments, assets $ 488,157 $ 230,686
Net financial instruments, liabilities (198) (5,269)
Designated As Hedges:    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 470,470 169,469
Gross financial instruments, liabilities 0 0
Designated As Hedges: | Other current assets | Interest rate contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 169,318  
Designated As Hedges: | Other current liabilities | Interest rate contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, liabilities 0  
Designated As Hedges: | Deferred charges and other assets | Interest rate contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 301,152 169,469
Designated As Hedges: | Deferred credits and other liabilities | Interest rate contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, liabilities 0 0
Not Designated As Hedges:    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 17,687 61,217
Gross financial instruments, liabilities (198) (5,269)
Not Designated As Hedges: | Other current assets | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 17,518 55,073
Not Designated As Hedges: | Other current liabilities | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, liabilities (193) (5,269)
Not Designated As Hedges: | Deferred charges and other assets | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, assets 169 6,144
Not Designated As Hedges: | Deferred credits and other liabilities | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross financial instruments, liabilities $ (5) $ 0