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Contingencies and Guaranty (Details) $ in Thousands	1 Months Ended					3 Months Ended		12 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Apr. 30, 2023 USD ($)	Oct. 31, 2022	Feb. 28, 2021 USD ($)	Jun. 30, 2025 USD ($) country county	Jun. 30, 2024 USD ($) county	Mar. 31, 2025 USD ($) country	Nov. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Commitments And Contingencies [Line Items]
Contingent liability	$ 19,067					$ 19,067		$ 8,093			$ 1,000
Payments to acquire intangible assets						$ 3,966	$ 5,400
Broadband licenses granted, number of counties | county						62	1
Decrease in contingent liability						$ (1,054)	$ (10,000)
Prepayments received	128,214	$ 120,687				128,214	120,687	$ 124,672		$ 122,212
Employer contribution amount						200	$ 200
Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Wireless Licenses
Commitments And Contingencies [Line Items]
Consideration transferred	28,000
Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Maximum | Wireless Licenses
Commitments And Contingencies [Line Items]
Prepayments received	28,000					28,000
Lower Colorado River Authority (LCRA) | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Commitments And Contingencies [Line Items]
Short-term contingent consideration	11,000					11,000
Long-term contingent consideration	4,200					4,200
Lower Colorado River Authority (LCRA) | Licensing Agreements
Commitments And Contingencies [Line Items]
Contingent liability									$ 1,400
Payments to acquire intangible assets			$ 30,000
Lower Colorado River Authority | Licensing Agreements
Commitments And Contingencies [Line Items]
Payments to acquire intangible assets						$ 1,100
Broadband licenses granted, number of counties | country						24
Decrease in contingent liability						$ 1,100
Broadband license narrowband spectrum licenses previously received						100
Oncor Electric Delivery Company LLC | Licensing Agreements
Commitments And Contingencies [Line Items]
Long-term contingent consideration	7,000					7,000
Broadband licenses granted estimated consideration		$ 102,500
Oncor Electric Delivery Company LLC | Licensing Agreements For Four Counties
Commitments And Contingencies [Line Items]
Broadband licenses granted, number of counties | country								4
Oncor Electric Delivery Company LLC | Licensing Agreements For Four Counties | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Commitments And Contingencies [Line Items]
Milestone payment received								$ 34,000
Proceeds from nontrade receivable						$ 2,900
Oncor Electric Delivery Company LLC | Licensing Agreements For Three Counties
Commitments And Contingencies [Line Items]
Broadband licenses granted, number of counties | country						3
Oncor Electric Delivery Company LLC | Licensing Agreements For Three Counties | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Commitments And Contingencies [Line Items]
Milestone payment received						$ 300
Proceeds from nontrade receivable						20
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Commitments And Contingencies [Line Items]
Agreement term (in years)				20 years
Prepayments received	67,100					67,100
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Maximum
Commitments And Contingencies [Line Items]
Prepayments received	$ 61,200					$ 61,200
SDG&E
Commitments And Contingencies [Line Items]
Consideration transferred					$ 50,000

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