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Revenue and Accounts Receivable - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Disaggregation of Revenue [Line Items]      
Total operating revenues $ 4,702,755 $ 4,165,187 $ 4,275,357
Mississippi recovery of uncollectible accounts   (4,192)  
Distribution      
Disaggregation of Revenue [Line Items]      
Total operating revenues 4,422,355 3,912,134 4,096,661
Pipeline and Storage      
Disaggregation of Revenue [Line Items]      
Total operating revenues 280,400 253,053 178,696
Operating Segments      
Disaggregation of Revenue [Line Items]      
Total operating revenues 5,490,697 4,853,170 4,884,864
Operating Segments | Distribution      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 4,361,803 3,847,167 4,051,778
Alternative revenue program revenues 49,215 52,401 43,139
Other revenues 14,379 15,573 4,773
Total operating revenues 4,425,397 3,915,141 4,099,690
Operating Segments | Distribution | Gas sales revenues      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 4,196,804 3,700,731 3,920,314
Operating Segments | Distribution | Gas sales revenues | Residential      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 2,877,456 2,542,438 2,606,658
Operating Segments | Distribution | Gas sales revenues | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 1,145,710 1,006,593 1,100,773
Operating Segments | Distribution | Gas sales revenues | Industrial      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 122,284 100,363 151,538
Operating Segments | Distribution | Gas sales revenues | Public authority and other      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 51,354 51,337 61,345
Operating Segments | Distribution | Transportation revenues      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 151,876 134,600 121,420
Operating Segments | Distribution | Miscellaneous revenues      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 13,123 11,836 10,044
Operating Segments | Pipeline and Storage      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 1,131,764 998,687 824,148
Alternative revenue program revenues (66,464) (60,658) (38,974)
Other revenues 0 0 0
Total operating revenues 1,065,300 938,029 785,174
Operating Segments | Pipeline and Storage | Gas sales revenues      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 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
Operating Segments | Pipeline and Storage | Gas sales revenues | Commercial      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 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
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
Operating Segments | Pipeline and Storage | Transportation revenues      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers 1,119,015 982,795 811,968
Operating Segments | Pipeline and Storage | Miscellaneous revenues      
Disaggregation of Revenue [Line Items]      
Revenues from contracts with customers $ 12,749 $ 15,892 $ 12,180