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Segment Information - Schedule of Revenue from External Customers by Products and Services (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total operating revenues $ 4,702,755 $ 4,165,187 $ 4,275,357
Distribution      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total operating revenues 4,422,355 3,912,134 4,096,661
Distribution | Gas sales revenues      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total operating revenues 4,246,018 3,753,132 3,965,371
Distribution | Transportation revenues      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total operating revenues 149,853 132,608 119,371
Distribution | Other gas revenues      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total operating revenues 26,484 26,394 11,919
Distribution | Residential | Gas sales revenues      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total operating revenues 2,916,245 2,583,681 2,638,689
Distribution | Commercial | Gas sales revenues      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total operating revenues 1,154,591 1,016,675 1,112,236
Distribution | Industrial | Gas sales revenues      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total operating revenues 122,576 100,596 151,970
Distribution | Public authority and other | Gas sales revenues      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total operating revenues 52,606 52,180 62,476
Pipeline and Storage      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total operating revenues $ 280,400 $ 253,053 $ 178,696