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Fair Value of Financial Instruments - Derivative Contract Positions (Details) bbl in Thousands, $ in Thousands	Jun. 30, 2025 USD ($) bbl	Mar. 31, 2025 USD ($) bbl
Derivative contract information
Fair Value of Net Assets (Liabilities)	$ (4,188)	$ (9,688)
Net cash collateral held	(643)	3,104
Net derivative liability	(4,831)	(6,584)
Fixed-price contract | Crude oil
Derivative contract information
Fair Value of Net Assets (Liabilities)	(3,245)	(6,492)
Fixed-price contract | Propane
Derivative contract information
Fair Value of Net Assets (Liabilities)	213
Fixed-price contract | Butane
Derivative contract information
Fair Value of Net Assets (Liabilities)	$ 1,955	$ (482)
Fixed-price contract | Long | Crude oil
Derivative contract information
Net Long (Short) Notional Units (in barrels) | bbl		59
Fixed-price contract | Short | Crude oil
Derivative contract information
Net Long (Short) Notional Units (in barrels) | bbl	(162)
Fixed-price contract | Short | Propane
Derivative contract information
Net Long (Short) Notional Units (in barrels) | bbl	(103)
Fixed-price contract | Short | Butane
Derivative contract information
Net Long (Short) Notional Units (in barrels) | bbl	(803)	(1,148)
Interest rate swaps
Derivative contract information
Fair Value of Net Assets (Liabilities)	$ (3,407)	$ (2,539)
Other
Derivative contract information
Fair Value of Net Assets (Liabilities)	$ 296	$ (175)

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- Definition

The amount of the obligation to return cash collateral or right to reclaim cash collateral under master netting arrangements.

+ References

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
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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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 20
-Name Accounting Standards Codification
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Nominal number of units used to calculate payment on derivative.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Fair value as of the balance sheet date of price risk derivative assets, net of price risk derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet.

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