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Financial Instruments - Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Sep. 30, 2019
Derivatives Fair Value [Line Items]    
Net Financial Instruments, Assets $ 882 $ 1,811
Net Financial Instruments, Liabilities (1,714) (5,801)
Not Designated as Hedging Instrument    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 882 1,811
Gross Financial Instruments, Liabilities (1,714) (5,801)
Not Designated as Hedging Instrument | Other Current Assets | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 880 1,586
Not Designated as Hedging Instrument | Other Current Liabilities | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Liabilities (1,714) (4,552)
Not Designated as Hedging Instrument | Deferred Charges and Other Assets | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 2 225
Not Designated as Hedging Instrument | Deferred Credits and Other Liabilities | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Liabilities $ 0 $ (1,249)