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Financial Instruments - Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Sep. 30, 2020
Derivatives Fair Value [Line Items]    
Net Financial Instruments, Assets $ 238,919 $ 80,678
Net Financial Instruments, Liabilities (5,402) (2,015)
Designated As Hedges:    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 225,502 73,055
Gross Financial Instruments, Liabilities (3,476) 0
Designated As Hedges: | Other current assets | Interest rate contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 89,260  
Designated As Hedges: | Other current liabilities | Interest rate contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Liabilities (2,902)  
Designated As Hedges: | Deferred charges and other assets | Interest rate contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 136,242 73,055
Designated As Hedges: | Deferred credits and other liabilities | Interest rate contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Liabilities (574) 0
Not Designated As Hedges:    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 13,417 7,623
Gross Financial Instruments, Liabilities (1,926) (2,015)
Not Designated As Hedges: | Other current assets | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 12,024 5,687
Not Designated As Hedges: | Other current liabilities | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Liabilities (1,926) (2,015)
Not Designated As Hedges: | Deferred charges and other assets | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 1,393 1,936
Not Designated As Hedges: | Deferred credits and other liabilities | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Liabilities $ 0 $ 0