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Financial Instruments - Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details) - USD ($)
Jun. 30, 2019
Sep. 30, 2018
Derivatives Fair Value [Line Items]    
Contract Netting $ 0 $ 0
Net Financial Instruments, Assets 2,557,000 1,619,000
Cash collateral 0  
Net Financial Instruments, Liabilities (3,871,000) (56,837,000)
Designated as Hedging Instrument    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets   0
Gross Financial Instruments, Liabilities   (56,499,000)
Designated as Hedging Instrument | Other Current Assets | Interest rate agreements    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets   0
Designated as Hedging Instrument | Other Current Liabilities | Interest rate agreements    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Liabilities   (56,499,000)
Not Designated as Hedging Instrument    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 2,557,000 1,619,000
Gross Financial Instruments, Liabilities (3,871,000) (338,000)
Not Designated as Hedging Instrument | Other Current Assets | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 2,408,000 1,369,000
Not Designated as Hedging Instrument | Other Current Liabilities | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Liabilities (3,358,000) (235,000)
Not Designated as Hedging Instrument | Deferred Charges and Other Assets | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 149,000 250,000
Not Designated as Hedging Instrument | Deferred Credits and Other Liabilities | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Liabilities $ (513,000) $ (103,000)