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Discontinued Operations - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 03, 2017
Jan. 01, 2017
Jan. 31, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Pre-tax gain included in income         $ 0 $ 0 $ 10,579
Discontinued Operations, Disposed of by Sale              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Increase (decrease) in purchased gas cost             (6,800)
Discontinued Operations, Disposed of by Sale | Natural Gas Marketing              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Pre-tax gain included in income             10,600
Natural Gas Marketing | Discontinued Operations, Disposed of by Sale              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Purchase price   $ 38,300          
Working capital   109,000          
Cash consideration   147,300          
Escrow deposit   $ 7,000          
Escrow release     $ 3,000        
Diluted share (in dollars per share)       $ 0.03      
Cash flow hedge ineffectiveness             $ 3,400
Maximum | Natural Gas Marketing | Discontinued Operations, Disposed of by Sale              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Useful lives             30 years
Minimum | Natural Gas Marketing | Discontinued Operations, Disposed of by Sale              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Useful lives             3 years
Unsecured Revolving Credit Note | $15 Million Revolving Credit Note | Natural Gas Marketing | Discontinued Operations, Disposed of by Sale              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Extinguishment of debt $ 15,000            
Revolving Credit Facility | $25 Million Uncommitted Facility | Natural Gas Marketing | Discontinued Operations, Disposed of by Sale              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Extinguishment of debt $ 25,000