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Contingencies and Guaranty (Details) - USD ($) $ in Thousands	1 Months Ended				3 Months Ended
	Dec. 31, 2023	Apr. 30, 2023	Oct. 31, 2022	Feb. 28, 2021	Jun. 30, 2024	Jun. 30, 2023	Mar. 31, 2024	Mar. 31, 2023
Commitments And Contingencies [Line Items]
Contingent liability				$ 20,000	$ 25,000		$ 15,000
Payments to acquire intangible assets					5,400	$ 5,170
Increase in deposit assets	$ 7,500
Prepayments received					120,687	$ 60,151	$ 122,212	$ 60,759
Lower Colorado River Authority (LCRA) | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Commitments And Contingencies [Line Items]
Initial payment received	$ 15,000
Lower Colorado River Authority (LCRA) | Licensing Agreements
Commitments And Contingencies [Line Items]
Payments to acquire intangible assets		$ 30,000
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Commitments And Contingencies [Line Items]
Agreement term			20 years
Prepayments received					67,100
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Maximum
Commitments And Contingencies [Line Items]
Prepayments received					$ 64,400
SDG&E
Commitments And Contingencies [Line Items]
Consideration transferred				$ 50,000

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