v3.26.1
Segment Information - Schedule of Balance Sheet Information by Segment (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Sep. 30, 2025
Segment Reporting Information [Line Items]    
Net property, plant and equipment $ 27,069,944 $ 25,292,990
Total assets 30,380,096 28,249,522
Operating Segments    
Segment Reporting Information [Line Items]    
Net property, plant and equipment 27,069,944 25,292,990
Total assets 36,793,139 34,193,451
Operating Segments | Distribution    
Segment Reporting Information [Line Items]    
Net property, plant and equipment 20,101,608 18,765,128
Total assets 29,384,731 27,296,805
Operating Segments | Pipeline and Storage    
Segment Reporting Information [Line Items]    
Net property, plant and equipment 6,968,336 6,527,862
Total assets 7,408,408 6,896,646
Intersegment Eliminations    
Segment Reporting Information [Line Items]    
Total assets $ (6,413,043) $ (5,943,929)