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Significant Accounting Policies - Inventories (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Mar. 31, 2025
--- | --- | ---
Inventory |  |
Crude oil | $ 25,416 | $ 23,962
Propane | 10,720 | 11,847
Total | 81,479 | 69,916
Butane Inventory |  |
Inventory |  |
Energy Related Inventory, Natural Gas Liquids | 36,614 | 22,674
Other natural gas liquids |  |
Inventory |  |
Energy Related Inventory, Natural Gas Liquids | $ 8,729 | $ 11,433

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