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Property, Plant and Equipment (Tables) | 12 Months Ended
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Mar. 31, 2026
Property, Plant and Equipment [Abstract] |
Schedule of property, plant and equipment | Our property, plant and equipment consists of the following at the dates indicated:
|  | Estimated |  | March 31,
Description |  | Useful Lives |  | 2026 |  | 2025
|  | (in years) |  | (in thousands)
Water treatment facilities and equipment (1) |  | 2 | - | 30 |  | $ | 2,418,731 |  |  | $ | 2,240,919 |
Pipeline and related facilities |  | 30 | - | 40 |  | 266,324 |  |  | 266,324 |
Crude oil tanks and related equipment |  | 2 | - | 30 |  | 234,217 |  |  | 230,174 |
Buildings and leasehold improvements |  | 3 | - | 40 |  | 124,783 |  |  | 124,388 |
Natural gas liquids terminal and storage assets |  | 2 | - | 30 |  | 100,404 |  |  | 99,805 |
Land |  |  |  |  |  | 64,610 |  |  | 64,733 |
Tank bottoms and linefill (2) |  |  |  |  |  | 37,551 |  |  | 30,623 |
Information technology equipment |  | 3 | - | 7 |  | 31,762 |  |  | 31,319 |
Vehicles and railcars (3) |  | 3 | - | 25 |  | 23,734 |  |  | 33,629 |
Other |  | 3 | - | 20 |  | 19,360 |  |  | 19,161 |
Construction in progress |  |  |  |  |  | 42,557 |  |  | 30,354 |
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 |
(1) Includes finance leases right-of-use assets of $8.6 million at March 31, 2026. Accumulated amortization related to these finance leases is included within accumulated depreciation. (2) Tank bottoms, which are product volumes required for the operation of storage tanks, are recorded at historical cost. We recover tank bottoms when the storage tanks are removed from service. Linefill, which represents our portion of the product volume required for the operation of the proportionate share of a pipeline we own, is recorded at historical cost. (3) Includes finance leases right-of-use assets of $0.2 million and $0.1 million at March 31, 2026 and 2025, respectively. Accumulated amortization related to these finance leases is included within accumulated depreciation. Amounts in the table above do not include assets classified as either held for sale or discontinued operations within our March 31, 2025 consolidated balance sheet (see Note 18).
Schedule of depreciation expense and capitalized interest expense | The following table summarizes depreciation expense and capitalized interest expense for the periods indicated:
|  | Year Ended March 31,
|  | 2026 |  | 2025 |  | 2024
|  | (in thousands)
Depreciation expense |  | $ | 200,174 |  |  | $ | 198,859 |  |  | $ | 198,542 |
Capitalized interest expense |  | $ | 1,132 |  |  | $ | 2,121 |  |  | $ | 1,561 |
Amounts in the table above do not include depreciation expense related to our refined products and biodiesel businesses, as these amounts have been classified within discontinued operations within our consolidated statements of operations (see Note 18).
Schedule of (gains) losses from the sales of property plant and equipment and any write-downs in value due to impairment | The following table summarizes (gains) losses on the disposal or impairment of property, plant and equipment by segment for the periods indicated:
|  | Year Ended March 31,
|  | 2026 |  | 2025 |  | 2024
|  | (in thousands)
Water Solutions (1) |  | $ | 18,041 |  |  | $ | 9,007 |  |  | $ | 38,938 |
Crude Oil Logistics (2) |  | 267 |  |  | (335) |  |  | 2,910 |
Liquids Logistics (3) |  | (19) |  |  | (628) |  |  | (810) |
Corporate and Other |  | (2) |  |  | 43 |  |  | (720) |
Total |  | $ | 18,287 |  |  | $ | 8,087 |  |  | $ | 40,318 |
(1) Amount does not include the net loss recognized on the sale of certain investments in unconsolidated entities and related assets during the year ended March 31, 2026 discussed in Note 17. Amount does not include the gain recognized on the sale of certain freshwater water solutions facilities and certain saltwater disposal assets during the year ended March 31, 2025 discussed in Note 17. Amount does not include the loss recognized on the sale of certain saltwater disposal assets during the year ended March 31, 2024 discussed in Note 17. (2) Amounts do not include the gains recognized on the sale of certain railcars during the years ended March 31, 2026 and 2025 discussed in Note 17. (3) Amount does not include the net gains recognized on the Wholesale Propane Disposition and the sale of our refined products business during the year ended March 31, 2026 discussed in Note 17. Amount does not include the gain recognized on the sale of our natural gas liquids terminal in Green Bay, Wisconsin during the year ended March 31, 2025 discussed in Note 17. Amount does not include the gain recognized on the sale of three natural gas liquids terminals during the year ended March 31, 2024 discussed in Note 17.

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- Definition Schedule of (gains) losses from the sales of property plant and equipment and any write-downs in value due to impairment within our consolidated statements of operations. + References No definition available. + Details
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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
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