Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2020
Segment information
REVENUES	$ 1,462,019	$ 2,226,529	$ 3,474,592	$ 5,902,756
Depreciation and amortization, including amortization of debt issuance costs	81,548	76,916	260,054	198,613
Operating (Loss) Income	(346,307)	96,395	(320,776)	174,030
Additions to property, plant and equipment and intangible assets	11,517	702,847	65,873	1,881,228
Long-lived assets, net	4,967,908		4,967,908		$ 5,638,330
Total assets	5,951,710		5,951,710		6,498,736
Operating segment | Crude oil logistics
Segment information
REVENUES	485,289	690,989	1,228,169	2,048,301
Depreciation and amortization, including amortization of debt issuance costs	16,513	17,950	50,540	53,228
Operating (Loss) Income	(382,192)	28,696	(310,633)	101,018
Additions to property, plant and equipment and intangible assets	785	4,953	9,555	23,817
Long-lived assets, net	1,101,836		1,101,836		1,567,503
Total assets	1,542,429		1,542,429		1,886,211
Operating segment | Crude oil logistics | Crude oil sales
Segment information
REVENUES	455,790	646,296	1,104,692	1,925,039
Operating segment | Crude oil logistics | Crude oil transportation and other
Segment information
REVENUES	28,407	44,613	118,615	127,767
Operating segment | Crude oil logistics | Non-Topic 606 revenues
Segment information
Non-Topic 606 revenues	2,919	3,585	9,193	10,825
Operating segment | Water solutions
Segment information
REVENUES	98,925	121,607	275,668	294,639
Depreciation and amortization, including amortization of debt issuance costs	53,388	48,184	173,865	114,438
Operating (Loss) Income	15,821	(583)	(13,503)	34,380
Additions to property, plant and equipment and intangible assets	5,177	692,826	38,139	1,838,237
Long-lived assets, net	3,209,163		3,209,163		3,382,727
Total assets	3,319,273		3,319,273		3,539,328
Operating segment | Water solutions | Disposal service fees
Segment information
REVENUES	82,008	94,218	239,390	226,635
Operating segment | Water solutions | Sale of recovered crude oil
Segment information
REVENUES	6,778	16,470	16,532	45,566
Operating segment | Water solutions | Sale of brackish non-potable water
Segment information
REVENUES	5,221	5,634	8,201	9,737
Operating segment | Water solutions | Other revenues
Segment information
REVENUES	4,918	5,285	11,545	12,701
Operating segment | Liquids and refined products
Segment information
REVENUES	877,491	1,413,653	1,969,813	3,559,017
Depreciation and amortization, including amortization of debt issuance costs	7,071	7,030	22,406	21,296
Operating (Loss) Income	32,438	89,038	51,338	113,207
Additions to property, plant and equipment and intangible assets	2,572	2,641	7,292	13,689
Long-lived assets, net	614,966		614,966		654,530
Total assets	1,023,861		1,023,861		972,684
Operating segment | Liquids and refined products | Non-Topic 606 revenues
Segment information
Non-Topic 606 revenues	20,302	105,944	59,816	269,748
Operating segment | Liquids and refined products | Other revenues
Segment information
REVENUES	4,685	5,181	17,710	22,230
Operating segment | Liquids and refined products | Refined products sales
Segment information
REVENUES	286,640	627,590	785,968	1,942,146
Operating segment | Liquids and refined products | Propane sales
Segment information
REVENUES	276,459	309,668	534,525	564,820
Operating segment | Liquids and refined products | Butane sales
Segment information
REVENUES	191,710	226,730	336,827	396,776
Operating segment | Liquids and refined products | Other product sales
Segment information
REVENUES	99,624	145,082	238,377	376,148
Operating segment | Corporate and Other
Segment information
REVENUES	314	280	942	799
Operating segment | Corporate and Other | Non-Topic 606 revenues
Segment information
Non-Topic 606 revenues	314	280	942	799
Elimination of intersegment sales | Crude oil logistics
Segment information
REVENUES	(1,827)	(3,505)	(4,331)	(15,330)
Elimination of intersegment sales | Liquids and refined products
Segment information
REVENUES	(1,929)	(6,542)	(3,410)	(12,851)
Corporate and other
Segment information
Depreciation and amortization, including amortization of debt issuance costs	4,576	3,752	13,243	9,651
Operating (Loss) Income	(12,374)	(20,756)	(47,978)	(74,575)
Additions to property, plant and equipment and intangible assets	2,983	$ 2,427	10,887	$ 5,485
Long-lived assets, net	41,943		41,943		33,570
Total assets	66,147		66,147		100,513
Non-US | Liquids and refined products
Segment information
Long-lived assets, net	19,300		19,300		25,900
Total assets	$ 47,300		$ 47,300		$ 37,800