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Financial Instruments - Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Derivatives Fair Value [Line Items]    
Net Financial Instruments, Assets $ 150,398 $ 80,678
Net Financial Instruments, Liabilities (1,843) (2,015)
Designated as Hedging Instrument    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 149,162 73,055
Gross Financial Instruments, Liabilities 0 0
Designated as Hedging Instrument | Other Current Assets | Interest rate contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 56,484  
Designated as Hedging Instrument | Other Current Liabilities | Interest rate contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Liabilities 0  
Designated as Hedging Instrument | Deferred Charges and Other Assets | Interest rate contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 92,678 73,055
Designated as Hedging Instrument | Deferred Credits and Other Liabilities | Interest rate contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Liabilities 0 0
Not Designated as Hedging Instrument    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 1,236 7,623
Gross Financial Instruments, Liabilities (1,843) (2,015)
Not Designated as Hedging Instrument | Other Current Assets | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 993 5,687
Not Designated as Hedging Instrument | Other Current Liabilities | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Liabilities (1,843) (2,015)
Not Designated as Hedging Instrument | Deferred Charges and Other Assets | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 243 1,936
Not Designated as Hedging Instrument | Deferred Credits and Other Liabilities | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Liabilities $ 0 $ 0