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Revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]      
Total operating revenues $ 2,901,848 $ 3,115,546 $ 2,759,735
Distribution      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 2,756,387    
Alternative Revenue Program Revenues (12,958)    
Regulated Operating Revenue, Other 2,032    
Pipeline and Storage      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 631,868    
Alternative Revenue Program Revenues (64,844)    
Regulated Operating Revenue, Other $ 0    
Regulatory Mechanism Threshold 75.00%    
Gas sales revenue [Member] | Distribution      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers $ 2,632,842    
Gas sales revenue [Member] | Pipeline and Storage      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0    
Gas sales revenue [Member] | Residential | Distribution      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 1,755,229    
Gas sales revenue [Member] | Residential | Pipeline and Storage      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0    
Gas sales revenue [Member] | Commercial | Distribution      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 716,757    
Gas sales revenue [Member] | Commercial | Pipeline and Storage      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0    
Gas sales revenue [Member] | Industrial | Distribution      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 118,060    
Gas sales revenue [Member] | Industrial | Pipeline and Storage      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0    
Gas sales revenue [Member] | Public authority and other | Distribution      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 42,796    
Gas sales revenue [Member] | Public authority and other | Pipeline and Storage      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 0    
Transportation revenue [Member] | Distribution      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 97,495    
Transportation revenue [Member] | Pipeline and Storage      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 623,808    
Miscellaneous revenue [Member] | Distribution      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 26,050    
Miscellaneous revenue [Member] | Pipeline and Storage      
Disaggregation of Revenue [Line Items]      
Revenue from contracts with customers 8,060    
Operating Segments | Distribution      
Disaggregation of Revenue [Line Items]      
Total operating revenues 2,745,461 3,003,047 2,649,175
Operating Segments | Pipeline and Storage      
Disaggregation of Revenue [Line Items]      
Total operating revenues $ 567,024 $ 507,713 $ 457,030