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Financial Instruments - Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details) - USD ($)
Dec. 31, 2019
Sep. 30, 2019
Derivatives Fair Value [Line Items]    
Contract Netting $ 0 $ 0
Net Financial Instruments, Assets 1,371,000 1,811,000
Cash collateral 0  
Net Financial Instruments, Liabilities (8,830,000) (5,801,000)
Not Designated as Hedging Instrument    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 1,371,000 1,811,000
Gross Financial Instruments, Liabilities (8,830,000) (5,801,000)
Not Designated as Hedging Instrument | Other Current Assets | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 1,213,000 1,586,000
Not Designated as Hedging Instrument | Other Current Liabilities | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Liabilities (8,391,000) (4,552,000)
Not Designated as Hedging Instrument | Deferred Charges and Other Assets | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 158,000 225,000
Not Designated as Hedging Instrument | Deferred Credits and Other Liabilities | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Liabilities $ (439,000) $ (1,249,000)