v3.26.1
Segment Information - Schedule of Balance Sheet Information by Segment (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Sep. 30, 2025
Segment Reporting [Line Items]    
Net property, plant and equipment $ 28,015,610 $ 25,292,990
Total assets 31,585,539 28,249,522
Operating Segments    
Segment Reporting [Line Items]    
Net property, plant and equipment 28,015,610 25,292,990
Total assets 38,029,124 34,193,451
Operating Segments | Distribution    
Segment Reporting [Line Items]    
Net property, plant and equipment 20,878,848 18,765,128
Total assets 30,490,005 27,296,805
Operating Segments | Pipeline and Storage    
Segment Reporting [Line Items]    
Net property, plant and equipment 7,136,762 6,527,862
Total assets 7,539,119 6,896,646
Intersegment eliminations    
Segment Reporting [Line Items]    
Total assets $ (6,443,585) $ (5,943,929)