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Financial Instruments - Schedule of Derivative Instruments in Statement of Financial Position, Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Sep. 30, 2019
Derivatives Fair Value [Line Items]    
Net Financial Instruments, Assets $ 5,864 $ 1,811
Net Financial Instruments, Liabilities (11,103) (5,801)
Designated as Hedging Instrument    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 4,247  
Gross Financial Instruments, Liabilities (10,605)  
Designated as Hedging Instrument | Other Current Assets | Interest rate swaps    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 66  
Designated as Hedging Instrument | Other Current Liabilities | Interest rate swaps    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Liabilities (5,305)  
Designated as Hedging Instrument | Deferred Charges and Other Assets | Interest rate swaps    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 4,181  
Designated as Hedging Instrument | Deferred Credits and Other Liabilities | Interest rate swaps    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Liabilities (5,300)  
Not Designated as Hedging Instrument    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 1,617 1,811
Gross Financial Instruments, Liabilities (498) (5,801)
Not Designated as Hedging Instrument | Other Current Assets | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 1,370 1,586
Not Designated as Hedging Instrument | Other Current Liabilities | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Liabilities (461) (4,552)
Not Designated as Hedging Instrument | Deferred Charges and Other Assets | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Assets 247 225
Not Designated as Hedging Instrument | Deferred Credits and Other Liabilities | Commodity contracts    
Derivatives Fair Value [Line Items]    
Gross Financial Instruments, Liabilities $ (37) $ (1,249)