Property, Plant and Equipment (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 31, 2023 USD ($)
Property, Plant and Equipment
Gross property, plant and equipment	$ 3,082,800		$ 3,082,800		$ 3,121,564
Accumulated depreciation	(945,414)		(945,414)		(898,184)
Net property, plant and equipment	2,137,386		2,137,386		2,223,380
Finance lease, right-of-use asset	100		100		100
Depreciation expense	49,588	$ 50,005	147,899	$ 145,862
Capitalized interest expense	458	$ 250	1,107	$ 740
Gain (loss) on sales and write-downs of certain assets	(137)		$ 12,795
Natural Gas Liquids Terminals
Property, Plant and Equipment
Number of terminals sold			3
Corporate and other
Property, Plant and Equipment
Gain (loss) on sales and write-downs of certain assets	(715)		$ (715)
Water Solutions
Property, Plant and Equipment
Gain (loss) on sales and write-downs of certain assets	(1,523)		11,884
Crude Oil Logistics
Property, Plant and Equipment
Gain (loss) on sales and write-downs of certain assets	2,101		2,436
Liquids Logistics
Property, Plant and Equipment
Gain (loss) on sales and write-downs of certain assets	0		(810)
Natural gas liquids terminal and storage assets
Property, Plant and Equipment
Gross property, plant and equipment	$ 158,248		$ 158,248		160,939
Natural gas liquids terminal and storage assets | Minimum
Property, Plant and Equipment
Useful life	2 years		2 years
Natural gas liquids terminal and storage assets | Maximum
Property, Plant and Equipment
Useful life	30 years		30 years
Pipeline and related facilities
Property, Plant and Equipment
Gross property, plant and equipment	$ 266,129		$ 266,129		265,253
Pipeline and related facilities | Minimum
Property, Plant and Equipment
Useful life	30 years		30 years
Pipeline and related facilities | Maximum
Property, Plant and Equipment
Useful life	40 years		40 years
Vehicles and railcars (1)
Property, Plant and Equipment
Gross property, plant and equipment	$ 92,197		$ 92,197		92,640
Vehicles and railcars (1) | Minimum
Property, Plant and Equipment
Useful life	3 years		3 years
Vehicles and railcars (1) | Maximum
Property, Plant and Equipment
Useful life	25 years		25 years
Water treatment facilities and equipment
Property, Plant and Equipment
Gross property, plant and equipment	$ 2,009,707		$ 2,009,707		2,040,792
Water treatment facilities and equipment | Minimum
Property, Plant and Equipment
Useful life	3 years		3 years
Water treatment facilities and equipment | Maximum
Property, Plant and Equipment
Useful life	30 years		30 years
Crude oil tanks and related equipment
Property, Plant and Equipment
Gross property, plant and equipment	$ 223,262		$ 223,262		221,881
Crude oil tanks and related equipment | Minimum
Property, Plant and Equipment
Useful life	2 years		2 years
Crude oil tanks and related equipment | Maximum
Property, Plant and Equipment
Useful life	30 years		30 years
Information technology equipment
Property, Plant and Equipment
Gross property, plant and equipment	$ 35,700		$ 35,700		35,884
Information technology equipment | Minimum
Property, Plant and Equipment
Useful life	3 years		3 years
Information technology equipment | Maximum
Property, Plant and Equipment
Useful life	7 years		7 years
Buildings and leasehold improvements
Property, Plant and Equipment
Gross property, plant and equipment	$ 122,421		$ 122,421		130,119
Buildings and leasehold improvements | Minimum
Property, Plant and Equipment
Useful life	3 years		3 years
Buildings and leasehold improvements | Maximum
Property, Plant and Equipment
Useful life	40 years		40 years
Land
Property, Plant and Equipment
Gross property, plant and equipment	$ 80,729		$ 80,729		89,474
Tank bottoms and linefill (2)
Property, Plant and Equipment
Gross property, plant and equipment	35,072		35,072		40,001
Other
Property, Plant and Equipment
Gross property, plant and equipment	$ 2,553		$ 2,553		10,908
Other | Minimum
Property, Plant and Equipment
Useful life	3 years		3 years
Other | Maximum
Property, Plant and Equipment
Useful life	20 years		20 years
Construction in progress
Property, Plant and Equipment
Gross property, plant and equipment	$ 56,782		$ 56,782		$ 33,673