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Contingencies and Guaranty (Details) $ in Thousands		1 Months Ended											12 Months Ended
	Apr. 20, 2023 county	Jan. 31, 2025 USD ($) county	Jun. 30, 2024 USD ($) county	Jan. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Nov. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)	Jul. 31, 2023 USD ($)	Apr. 30, 2023 USD ($)	Oct. 31, 2022	Sep. 30, 2022 USD ($)	Feb. 28, 2021 USD ($)	Mar. 31, 2025 USD ($) county	Mar. 31, 2024 USD ($) county	Nov. 30, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Commitments And Contingencies [Line Items]
Contingent liability												$ 20,000	$ 15,336	$ 15,000
Contingent liability					$ 1,000								8,093	1,000
Payments to acquire intangible assets													$ 18,095	$ 17,031
Increase in deposit assets					7,500
Broadband licenses granted, number of counties | county													67	28
Non-trade receivable													$ 2,926	$ 0
Prepayments received													124,672	122,212		$ 60,759
Employer contribution amount													500	$ 400
SDG&E | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Commitments And Contingencies [Line Items]
Milestone payment received					200		$ 25,200				$ 200
Milestone delivery delay adjustments							$ 1,100
Lower Colorado River Authority (LCRA) | Wireless Licenses
Commitments And Contingencies [Line Items]
Contingent liability															$ 1,400
Payments to acquire intangible assets									$ 30,000
Broadband licenses granted, estimated consideration		$ 13,500
Broadband licenses granted, number of counties | county	68	34
Lower Colorado River Authority (LCRA) | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Commitments And Contingencies [Line Items]
Initial payment received					$ 15,000
Short-term contingent consideration													1,100
Long-term contingent consideration													$ 15,300
Oncor Electric Delivery Company LLC
Commitments And Contingencies [Line Items]
Broadband licenses granted, number of counties | county													4
Oncor Electric Delivery Company LLC | Wireless Licenses
Commitments And Contingencies [Line Items]
Payments to acquire intangible assets													$ 34,000
Short-term contingent consideration													$ 6,000
Broadband licenses granted, estimated consideration			$ 102,500
Broadband licenses granted, initial consideration received			$ 10,000
Broadband licenses granted, number of counties | county			95										4
Oncor Electric Delivery Company LLC | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Commitments And Contingencies [Line Items]
Milestone payment received													$ 34,000
Non-trade receivable													2,900
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Commitments And Contingencies [Line Items]
Milestone payment received				$ 16,800		$ 21,200		$ 21,200
Agreement term (in years)										20 years
Prepayments received													67,100				$ 8,000
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Maximum
Commitments And Contingencies [Line Items]
Prepayments received													$ 62,000
SDG&E
Commitments And Contingencies [Line Items]
Consideration transferred												$ 50,000

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