Segment Information - Balance Sheet Information by Segment (Details) - USD ($) $ in Thousands |
Sep. 30, 2018 |
Sep. 30, 2017 |
---|---|---|
Segment Reporting Information [Line Items] | ||
Property, plant and equipment, net | $ 10,371,147 | $ 9,259,182 |
Total assets | 11,874,437 | 10,749,596 |
Operating Segments | Distribution | ||
Segment Reporting Information [Line Items] | ||
Property, plant and equipment, net | 7,644,693 | 6,849,517 |
Total assets | 11,109,128 | 10,050,164 |
Operating Segments | Pipeline and Storage | ||
Segment Reporting Information [Line Items] | ||
Property, plant and equipment, net | 2,726,454 | 2,409,665 |
Total assets | 2,963,480 | 2,621,601 |
Eliminations | Eliminations | ||
Segment Reporting Information [Line Items] | ||
Property, plant and equipment, net | 0 | 0 |
Total assets | $ (2,198,171) | $ (1,922,169) |