Segment Information - Schedule of Balance Sheet Information by Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 22,204,367	$ 19,606,583
Total assets	25,194,465	22,516,968
Operating Segments | Distribution
Segment Reporting Information [Line Items]
Property, plant and equipment, net	16,372,659	14,402,578
Total assets	24,328,877	21,716,467
Operating Segments | Pipeline and Storage
Segment Reporting Information [Line Items]
Property, plant and equipment, net	5,831,708	5,204,005
Total assets	6,181,558	5,504,972
Eliminations
Segment Reporting Information [Line Items]
Property, plant and equipment, net	0	0
Total assets	$ (5,315,970)	$ (4,704,471)