Revenue from Contract with Customers (Performance Obligations in Next 12 Months) (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 3,177,657
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 631,906
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	12 months
Refined Products Segment [Member]
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 2,058,298
Refined Products Segment [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Amount	374,304
Crude Oil Pipeline and Terminals Segment [Member]
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Amount	1,119,359
Crude Oil Pipeline and Terminals Segment [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 257,602
Minimum [Member] | Refined Products Segment [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Minimum [Member] | Crude Oil Pipeline and Terminals Segment [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Maximum [Member] | Refined Products Segment [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	19 years
Maximum [Member] | Crude Oil Pipeline and Terminals Segment [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01
Segment Reporting Information [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	12 years