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Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation of Revenue [Line Items]        
Total operating revenues $ 485,738 $ 562,245 $ 2,458,165 $ 2,670,846
Distribution segment        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 443,705   2,353,535  
Alternative Revenue Program Revenues 748   (13,388)  
Other Revenues 491   1,521  
Pipeline and storage segment        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 169,271   463,420  
Alternative Revenue Program Revenues (20,073)   (44,102)  
Other Revenues 0   0  
Gas sales revenue [Member] | Distribution segment        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 414,657   2,257,091  
Gas sales revenue [Member] | Pipeline and storage segment        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 0   0  
Gas sales revenue [Member] | Residential Customers [Member] | Distribution segment        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 269,484   1,513,239  
Gas sales revenue [Member] | Residential Customers [Member] | Pipeline and storage segment        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 0   0  
Gas sales revenue [Member] | Commercial Customers [Member] | Distribution segment        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 113,591   611,474  
Gas sales revenue [Member] | Commercial Customers [Member] | Pipeline and storage segment        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 0   0  
Gas sales revenue [Member] | Industrial Customers [Member] | Distribution segment        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 25,277   95,701  
Gas sales revenue [Member] | Industrial Customers [Member] | Pipeline and storage segment        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 0   0  
Gas sales revenue [Member] | Public Authority and Other Customers [Member] | Distribution segment        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 6,305   36,677  
Gas sales revenue [Member] | Public Authority and Other Customers [Member] | Pipeline and storage segment        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 0   0  
Transportation revenue [Member] | Distribution segment        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 22,923   76,005  
Transportation revenue [Member] | Pipeline and storage segment        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 166,864   456,558  
Miscellaneous revenue [Member] | Distribution segment        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 6,125   20,439  
Miscellaneous revenue [Member] | Pipeline and storage segment        
Disaggregation of Revenue [Line Items]        
Revenue from Contracts with Customer 2,407   6,862  
Operating Segments | Distribution segment        
Disaggregation of Revenue [Line Items]        
Total operating revenues 444,944 535,488 2,341,668 2,595,571
Operating Segments | Pipeline and storage segment        
Disaggregation of Revenue [Line Items]        
Total operating revenues $ 149,198 $ 127,633 $ 419,318 $ 375,051