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Revenue and Accounts Receivable - Disaggregation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disaggregation of Revenue [Line Items]        
Total operating revenues $ 816,429 $ 605,553 $ 3,479,034 $ 2,839,106
Distribution        
Disaggregation of Revenue [Line Items]        
Total operating revenues 772,497 557,931 $ 3,353,800 2,715,644
Regulatory mechanism threshold (in percent)     75.00%  
Pipeline and Storage        
Disaggregation of Revenue [Line Items]        
Total operating revenues 43,932 47,622 $ 125,234 123,462
Operating Segments | Distribution        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 772,909 556,066 3,329,133 2,730,273
Alternative revenue program revenues (77) 2,206 25,663 (13,666)
Other revenues 479 478 1,483 1,467
Total operating revenues 773,311 558,750 3,356,279 2,718,074
Operating Segments | Distribution | Gas sales revenues:        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 743,240 527,548 3,233,515 2,637,294
Operating Segments | Distribution | Gas sales revenues: | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 441,806 336,016 2,108,349 1,821,570
Operating Segments | Distribution | Gas sales revenues: | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 231,309 157,314 910,400 692,443
Operating Segments | Distribution | Gas sales revenues: | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 57,045 25,348 160,098 81,122
Operating Segments | Distribution | Gas sales revenues: | Public authority and other        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 13,080 8,870 54,668 42,159
Operating Segments | Distribution | Transportation revenues        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 27,216 25,903 87,886 84,643
Operating Segments | Distribution | Miscellaneous revenues        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 2,453 2,615 7,732 8,336
Operating Segments | Pipeline and Storage        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 189,509 168,514 526,045 493,866
Alternative revenue program revenues (6,097) (5,527) (15,968) (16,998)
Other revenues 0 0 0 0
Total operating revenues 183,412 162,987 510,077 476,868
Operating Segments | Pipeline and Storage | Gas sales revenues:        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | Pipeline and Storage | Gas sales revenues: | Residential        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | Pipeline and Storage | Gas sales revenues: | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 0 0
Operating Segments | Pipeline and Storage | Gas sales revenues: | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 0 0 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 0 0
Operating Segments | Pipeline and Storage | Transportation revenues        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers 186,405 164,619 514,114 480,945
Operating Segments | Pipeline and Storage | Miscellaneous revenues        
Disaggregation of Revenue [Line Items]        
Revenues from contracts with customers $ 3,104 $ 3,895 $ 11,931 $ 12,921