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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount, before accumulated amortization, of right-of-use asset from finance lease.

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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value.

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Amount of excess (deficiency) of insurance recovery over the loss incurred from an insured event.

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Amount of interest capitalized during the period.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.

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Property, Plant and Equipment (Details) $ in Thousands	12 Months Ended
Property, Plant and Equipment (Details) $ in Thousands	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)
Property, Plant and Equipment
Gross property, plant and equipment	$ 3,364,033	$ 3,171,429
Accumulated depreciation	(1,272,286)	(1,104,582)
Net property, plant and equipment	2,091,747	2,066,847
Depreciation expense	200,174	198,859	$ 198,542
Capitalized interest expense	1,132	2,121	1,561
(Gain) loss on sales and write-downs of certain assets	18,287	8,087	40,318
Gain/loss on disposal or impairment of assets, net	(256,322)	(31,448)	$ (115,936)
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	(2)	43	$ (720)
Gain/loss on disposal or impairment of assets, net			(700)
Water Solutions
Property, Plant and Equipment
(Gain) loss on sales and write-downs of certain assets	18,041	9,007	38,938
Asset impairment charges	20,200	15,200	35,900
Gain from insurance recovery	(2,200)	(6,500)	(3,900)
Gain/loss on disposal or impairment of assets, net	100	400	6,900
Crude Oil Logistics
Property, Plant and Equipment
(Gain) loss on sales and write-downs of certain assets	267	(335)	2,910
Gain/loss on disposal or impairment of assets, net	300	(300)	2,900
Liquids Logistics
Property, Plant and Equipment
(Gain) loss on sales and write-downs of certain assets	(19)	(628)	(810)
Gain/loss on disposal or impairment of assets, net		(600)
Liquids Logistics \| Operating segment
Property, Plant and Equipment
Gain/loss on disposal or impairment of assets, net			$ (800)
Water treatment facilities and equipment (1)
Property, Plant and Equipment
Gross property, plant and equipment	2,418,731	2,240,919
Finance lease, right-of-use asset	$ 8,600
Water treatment facilities and equipment (1) \| Minimum
Property, Plant and Equipment
Useful life	2 years
Water treatment facilities and equipment (1) \| Maximum
Property, Plant and Equipment
Useful life	30 years
Pipeline and related facilities
Property, Plant and Equipment
Gross property, plant and equipment	$ 266,324	266,324
Pipeline and related facilities \| Minimum
Property, Plant and Equipment
Useful life	30 years
Pipeline and related facilities \| Maximum
Property, Plant and Equipment
Useful life	40 years
Crude oil tanks and related equipment
Property, Plant and Equipment
Gross property, plant and equipment	$ 234,217	230,174
Crude oil tanks and related equipment \| Minimum
Property, Plant and Equipment
Useful life	2 years
Crude oil tanks and related equipment \| Maximum
Property, Plant and Equipment
Useful life	30 years
Buildings and leasehold improvements
Property, Plant and Equipment
Gross property, plant and equipment	$ 124,783	124,388
Buildings and leasehold improvements \| Minimum
Property, Plant and Equipment
Useful life	3 years
Buildings and leasehold improvements \| Maximum
Property, Plant and Equipment
Useful life	40 years
Natural gas liquids terminal and storage assets
Property, Plant and Equipment
Gross property, plant and equipment	$ 100,404	99,805
Natural gas liquids terminal and storage assets \| Minimum
Property, Plant and Equipment
Useful life	2 years
Natural gas liquids terminal and storage assets \| Maximum
Property, Plant and Equipment
Useful life	30 years
Land
Property, Plant and Equipment
Gross property, plant and equipment	$ 64,610	64,733
Tank bottoms and linefill (2)
Property, Plant and Equipment
Gross property, plant and equipment	37,551	30,623
Information technology equipment
Property, Plant and Equipment
Gross property, plant and equipment	$ 31,762	31,319
Information technology equipment \| Minimum
Property, Plant and Equipment
Useful life	3 years
Information technology equipment \| Maximum
Property, Plant and Equipment
Useful life	7 years
Vehicles and railcars (3)
Property, Plant and Equipment
Gross property, plant and equipment	$ 23,734	33,629
Finance lease, right-of-use asset	$ 200	100
Vehicles and railcars (3) \| Minimum
Property, Plant and Equipment
Useful life	3 years
Vehicles and railcars (3) \| Maximum
Property, Plant and Equipment
Useful life	25 years
Other
Property, Plant and Equipment
Gross property, plant and equipment	$ 19,360	19,161
Other \| Minimum
Property, Plant and Equipment
Useful life	3 years
Other \| Maximum
Property, Plant and Equipment
Useful life	20 years
Construction in progress
Property, Plant and Equipment
Gross property, plant and equipment	$ 42,557	$ 30,354