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Intangible Assets (Tables) | 12 Months Ended
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Mar. 31, 2026
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Schedule of finite-lived intangible assets | Our intangible assets consist of the following at the dates indicated:
|  |  |  | March 31, 2026 |  | March 31, 2025
Description |  | Weighted Average Remaining Useful Life |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net
|  | (in years) |  | (in thousands)
Customer relationships |  | 17.2 |  | $ | 857,903 |  |  | $ | (304,877) |  |  | $ | 553,026 |  |  | $ | 857,903 |  |  | $ | (264,675) |  |  | $ | 593,228 |
Customer commitments |  | 18.3 |  | 192,000 |  |  | (51,840) |  |  | 140,160 |  |  | 192,000 |  |  | (44,160) |  |  | 147,840 |
Rights-of-way and easements |  | 25.5 |  | 111,980 |  |  | (28,367) |  |  | 83,613 |  |  | 99,964 |  |  | (21,645) |  |  | 78,319 |
Executory contracts and other agreements |  | 23.0 |  | 19,324 |  |  | (4,654) |  |  | 14,670 |  |  | 19,973 |  |  | (5,106) |  |  | 14,867 |
Debt issuance costs (1) |  | 2.9 |  | 13,895 |  |  | (254) |  |  | 13,641 |  |  | 21,841 |  |  | (4,748) |  |  | 17,093 |
Total |  |  |  | $ | 1,195,102 |  |  | $ | (389,992) |  |  | $ | 805,110 |  |  | $ | 1,191,681 |  |  | $ | (340,334) |  |  | $ | 851,347 |
(1) Includes debt issuance costs related to the ABL Facility (as defined herein). Debt issuance costs related to the fixed-rate notes, 2026 Term Loan B (as defined herein) and 2024 Term Loan B (as defined herein) are reported as a reduction of the carrying amount of long-term debt. 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 amortization expense | Amortization expense is as follows for the periods indicated:
|  | Year Ended March 31,
Recorded In |  | 2026 |  | 2025 |  | 2024
|  | (in thousands)
Depreciation and amortization |  | $ | 54,657 |  |  | $ | 55,873 |  |  | $ | 67,572 |
Cost of sales-service |  | 1,068 |  |  | — |  |  | — |
Cost of sales-product |  | — |  |  | 257 |  |  | — |
Interest expense |  | 4,596 |  |  | 4,142 |  |  | 5,541 |
Operating expenses |  | 247 |  |  | 247 |  |  | 247 |
Total |  | $ | 60,568 |  |  | $ | 60,519 |  |  | $ | 73,360 |
Amounts in the table above do not include amortization 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 expected amortization of intangible assets | The following table summarizes expected amortization of our intangible assets at March 31, 2026 (in thousands):
Year Ending March 31, |
2027 | $ | 63,582 |
2028 | 55,333 |
2029 | 52,006 |
2030 | 44,558 |
2031 | 43,809 |
Thereafter | 545,822 |
Total | $ | 805,110 |

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