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Revenue and Accounts Receivable - Disaggregation (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disaggregation of Revenue [Line Items]    
Total operating revenues $ 1,484,009 $ 1,012,786
Distribution    
Disaggregation of Revenue [Line Items]    
Total operating revenues $ 1,439,693 971,636
Regulatory mechanism threshold (in percent) 75.00%  
Pipeline and Storage    
Disaggregation of Revenue [Line Items]    
Total operating revenues $ 44,316 41,150
Operating Segments | Distribution    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 1,458,203 920,943
Alternative revenue program revenues (18,322) 50,986
Other revenues 545 493
Total operating revenues 1,440,426 972,422
Operating Segments | Distribution | Gas sales revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 1,423,759 890,475
Operating Segments | Distribution | Gas sales revenues | Residential    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 953,051 575,841
Operating Segments | Distribution | Gas sales revenues | Commercial    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 388,667 250,761
Operating Segments | Distribution | Gas sales revenues | Industrial    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 59,215 48,681
Operating Segments | Distribution | Gas sales revenues | Public authority and other    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 22,826 15,192
Operating Segments | Distribution | Transportation revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 32,162 27,869
Operating Segments | Distribution | Miscellaneous revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 2,282 2,599
Operating Segments | Pipeline and Storage    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 197,974 170,402
Alternative revenue program revenues (11,345) (7,484)
Other revenues 0 0
Total operating revenues 186,629 162,918
Operating Segments | Pipeline and Storage | Gas sales revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Operating Segments | Pipeline and Storage | Gas sales revenues | Residential    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Operating Segments | Pipeline and Storage | Gas sales revenues | Commercial    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Operating Segments | Pipeline and Storage | Gas sales revenues | Industrial    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Operating Segments | Pipeline and Storage | Gas sales revenues | Public authority and other    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 0 0
Operating Segments | Pipeline and Storage | Transportation revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers 195,252 163,859
Operating Segments | Pipeline and Storage | Miscellaneous revenues    
Disaggregation of Revenue [Line Items]    
Revenues from contracts with customers $ 2,722 $ 6,543