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Financial Instruments Balance Sheet Location (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
ASSETS    
Contract netting $ 0 $ 0
Net Financial Instruments 1,811 1,619
Net Assets/Liabilities from Risk Management Activities 1,811 1,619
Liabilities [Abstract]    
Contract netting 0 0
Net Financial Instruments (5,801) (56,837)
Net Assets/Liabilities from Risk Management Activities (5,801) (56,837)
Designated as Hedging Instrument    
ASSETS    
Gross / Net Financial Instruments   0
Liabilities [Abstract]    
Gross / Net Financial Instruments   (56,499)
Designated as Hedging Instrument | Other Current Assets | Interest rate agreements    
ASSETS    
Gross / Net Financial Instruments   0
Designated as Hedging Instrument | Other Current Liabilities | Interest rate agreements    
Liabilities [Abstract]    
Gross / Net Financial Instruments   (56,499)
Not Designated as Hedging Instrument    
ASSETS    
Gross / Net Financial Instruments 1,811 1,619
Liabilities [Abstract]    
Gross / Net Financial Instruments (5,801) (338)
Not Designated as Hedging Instrument | Other Current Assets | Commodity contracts    
ASSETS    
Gross / Net Financial Instruments 1,586 1,369
Not Designated as Hedging Instrument | Deferred Charges And Other Assets | Commodity contracts    
ASSETS    
Gross / Net Financial Instruments 225 250
Not Designated as Hedging Instrument | Other Current Liabilities | Commodity contracts    
Liabilities [Abstract]    
Gross / Net Financial Instruments (4,552) (235)
Not Designated as Hedging Instrument | Deferred Credits And Other Liabilities | Commodity contracts    
Liabilities [Abstract]    
Gross / Net Financial Instruments $ (1,249) $ (103)