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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

X

- Definition

Carrying amount as of the balance sheet date of liquid hydrocarbon components recovered from natural gas.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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Carrying amount as of the balance sheet date of petroleum or crude oil.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 10
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Carrying amount as of the balance sheet date of product derived from petroleum during the processing of oil or natural gas which is then used as a heat source or fuel.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ References

No definition available.

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- Definition

Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
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-URI https://asc.fasb.org/1943274/2147481372/852-10-55-10

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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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