Segments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Mar. 31, 2025 USD ($)
Segment Reporting [Abstract]
Number of segments			3
Segment information
Total Revenues	$ 674,677	$ 756,472	$ 1,296,833	$ 1,515,706
Depreciation and amortization	63,994	61,875	130,579	124,039
Amortization in cost of sales - product	14,502	14,942	28,867	30,195
Interest expense	64,708	77,180	130,253	146,919
Gain on disposal or impairment of assets, net	6,594	1,509	(2,605)	(9,157)
Net unrealized gains on derivatives	(317)	2,610	(7,842)	7,522
Lower of cost or net realizable value adjustments	2,519	612	(425)	599
Gain on early extinguishment of liabilities, net	0	0	(1,492)	0
Asset retirement obligation accretion	1,281	1,025	2,541	2,028
Adjustments related to unconsolidated entities (4)		108	24	179
Other	(1,197)	(3,209)	438	(4,603)
Income from continuing operations before income taxes	29,751	7,667	59,834	20,471
Capital expenditures	51,093	94,215	72,145	171,746
Total assets	4,301,585	4,890,179	4,301,585	4,890,179	$ 4,609,440
Cost of Sales [Member]
Segment information
Amortization in cost of sales - product		37		37
Liquids Logistics | Non-US
Segment information
Total Revenues	21,000	27,400	36,000	51,500
Total assets	21,400	29,700	21,400	29,700
Operating segment
Segment information
Total Revenues	674,426	756,482	1,296,422	1,515,828
Segment Reporting, cost of sales	418,820	519,742	812,103	1,054,258
Segment Reporting, operating, general and administrative expenses	75,471	79,495	147,718	153,582
Segment Reporting, other items	(1,159)	259	(2,302)	(510)
Adjusted EBITDA	178,976	157,504	334,299	307,478
Capital expenditures	50,275	93,306	71,302	162,642
Total assets	4,249,117	4,844,284	4,249,117	4,844,284
Operating segment | Water Solutions
Segment information
Non-Topic 606 revenues	15	15	30	30
Total Revenues	209,743	181,867	411,023	363,277
Segment Reporting, cost of sales	1,081	(953)	2,739	907
Segment Reporting, operating, general and administrative expenses	55,601	54,238	111,206	107,412
Segment Reporting, other items	(1,159)	280	(2,307)	(493)
Adjusted EBITDA	151,902	128,862	294,771	254,465
Capital expenditures	47,261	87,596	66,235	152,280
Total assets	2,714,235	2,855,015	2,714,235	2,855,015
Operating segment | Crude Oil Logistics
Segment information
Non-Topic 606 revenues	1,220	1,780	2,593	3,570
Total Revenues	220,031	243,841	387,662	524,056
Segment Reporting, cost of sales	193,076	215,704	341,325	467,293
Segment Reporting, operating, general and administrative expenses	10,402	10,873	20,201	20,866
Segment Reporting, other items	0	(1)	0	1
Adjusted EBITDA	16,553	17,263	26,136	35,898
Capital expenditures	1,387	1,743	1,790	2,839
Total assets	1,138,420	1,282,369	1,138,420	1,282,369
Operating segment | Liquids Logistics
Segment information
Non-Topic 606 revenues	2,011	2,886	3,771	5,695
Total Revenues	244,652	330,774	497,737	628,495
Segment Reporting, cost of sales	224,663	304,991	468,039	586,058
Segment Reporting, operating, general and administrative expenses	9,468	14,384	16,311	25,304
Segment Reporting, other items	0	(20)	5	(18)
Adjusted EBITDA	10,521	11,379	13,392	17,115
Capital expenditures	1,627	3,967	3,277	7,523
Total assets	396,462	706,900	396,462	706,900
Operating segment | Disposal service fees | Water Solutions
Segment information
Topic 606 revenues, excluding assessed tax	179,827	155,715	354,462	303,688
Operating segment | Crude oil sales | Water Solutions
Segment information
Topic 606 revenues, excluding assessed tax	28,066	24,708	52,874	55,484
Operating segment | Crude oil sales | Crude Oil Logistics
Segment information
Topic 606 revenues, excluding assessed tax	211,824	225,013	370,352	487,622
Operating segment | Sale of water | Water Solutions
Segment information
Topic 606 revenues, excluding assessed tax	1,362	700	2,781	2,985
Operating segment | Other revenues | Water Solutions
Segment information
Topic 606 revenues, excluding assessed tax	473	729	876	1,090
Operating segment | Other revenues | Liquids Logistics
Segment information
Topic 606 revenues, excluding assessed tax	462	4,959	900	7,286
Operating segment | Crude oil transportation and other | Crude Oil Logistics
Segment information
Topic 606 revenues, excluding assessed tax	6,987	17,048	14,717	32,864
Operating segment | Propane sales | Liquids Logistics
Segment information
Topic 606 revenues, excluding assessed tax	31,706	89,716	93,186	187,074
Operating segment | Butane sales | Liquids Logistics
Segment information
Topic 606 revenues, excluding assessed tax	113,992	123,494	213,634	221,524
Operating segment | Other product sales | Liquids Logistics
Segment information
Topic 606 revenues, excluding assessed tax	96,481	109,719	186,246	206,916
Corporate and other
Segment information
Topic 606 revenues, excluding assessed tax	251	74	415	74
Total Revenues	251	(10)	411	(122)
Adjusted EBITDA	(11,643)	(8,090)	(22,994)	(19,444)
Capital expenditures	818	909	843	9,104
Total assets	52,468	45,895	52,468	45,895
Elimination of intersegment sales
Segment information
Topic 606 revenues, excluding assessed tax	$ 0	$ (84)	$ (4)	$ (196)