Segments (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)
Segment Reporting [Abstract]
Number of segments	3
Segment information
Total Revenues	$ 6,956,571	$ 8,694,904	$ 7,947,915
Depreciation and amortization, including amortization of debt issuance costs	282,731	290,879	306,208
Operating income (loss)	177,572	289,163	83,043
Acquisition of property, plant and equipment and intangible assets	170,067	140,740	135,022
Long-lived assets, net	3,768,117	4,084,632
Total assets	5,020,094	5,456,144
Assets held for sale	66,597	0
Water solutions
Segment information
Prior period reclassification adjustment		2,700	500
Liquids logistics | Non-US
Segment information
Total Revenues	132,100	211,000	238,000
Long-lived assets, net	10,200	12,500
Total assets	22,100	32,300
Operating segment | Water solutions
Segment information
Non-Topic 606 revenues	781	0	0
Total Revenues	730,818	697,038	544,866
Depreciation and amortization, including amortization of debt issuance costs	214,727	207,328	214,805
Operating income (loss)	231,256	198,924	94,851
Acquisition of property, plant and equipment and intangible assets	145,048	123,180	115,267
Long-lived assets, net	2,608,007	2,810,534
Total assets	2,818,444	3,009,869
Operating segment | Crude oil logistics
Segment information
Non-Topic 606 revenues	9,222	7,476	8,687
Total Revenues	1,656,064	2,464,822	2,505,496
Depreciation and amortization, including amortization of debt issuance costs	36,922	46,577	48,489
Operating income (loss)	52,074	81,524	45,033
Acquisition of property, plant and equipment and intangible assets	6,905	9,649	6,422
Long-lived assets, net	827,248	870,999
Total assets	1,368,461	1,616,953
Operating segment | Liquids logistics
Segment information
Non-Topic 606 revenues	627,855	476,404	254,148
Total Revenues	4,569,689	5,533,044	4,897,553
Depreciation and amortization, including amortization of debt issuance costs	10,632	13,575	19,000
Operating income (loss)	2,481	66,624	(8,441)
Acquisition of property, plant and equipment and intangible assets	15,791	5,704	11,185
Long-lived assets, net	298,595	363,736
Total assets	686,885	774,221
Operating segment | Disposal service fees | Water solutions
Segment information
Topic 606 revenues, excluding assessed tax	598,046	547,716	413,301
Operating segment | Crude oil sales | Water solutions
Segment information
Topic 606 revenues, excluding assessed tax	107,367	120,705	77,203
Operating segment | Crude oil sales | Crude oil logistics
Segment information
Topic 606 revenues, excluding assessed tax	1,597,238	2,376,434	2,432,393
Operating segment | Sale of water | Water solutions
Segment information
Topic 606 revenues, excluding assessed tax	11,594	17,509	39,518
Operating segment | Other revenues | Water solutions
Segment information
Topic 606 revenues, excluding assessed tax	13,030	11,108	14,844
Operating segment | Other revenues | Liquids logistics
Segment information
Topic 606 revenues, excluding assessed tax	8,209	7,944	8,781
Operating segment | Crude oil transportation and other | Crude oil logistics
Segment information
Topic 606 revenues, excluding assessed tax	50,151	89,502	75,484
Operating segment | Refined products sales | Liquids logistics
Segment information
Topic 606 revenues, excluding assessed tax	2,192,783	2,554,084	1,899,898
Operating segment | Propane sales | Liquids logistics
Segment information
Topic 606 revenues, excluding assessed tax	735,698	1,156,821	1,322,210
Operating segment | Butane sales | Liquids logistics
Segment information
Topic 606 revenues, excluding assessed tax	627,400	772,085	861,998
Operating segment | Other product sales | Liquids logistics
Segment information
Topic 606 revenues, excluding assessed tax	377,744	565,706	551,841
Elimination of intersegment sales | Crude oil logistics
Segment information
Topic 606 revenues, excluding assessed tax	(547)	(8,590)	(11,068)
Elimination of intersegment sales | Liquids logistics
Segment information
Topic 606 revenues, excluding assessed tax	0	0	(1,323)
Corporate and other
Segment information
Depreciation and amortization, including amortization of debt issuance costs	20,450	23,399	23,914
Operating income (loss)	(108,239)	(57,909)	(48,400)
Acquisition of property, plant and equipment and intangible assets	2,323	2,207	$ 2,148
Long-lived assets, net	34,267	39,363
Total assets	$ 79,707	$ 55,101