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Nature of Operations (Details) $ in Thousands	1 Months Ended									3 Months Ended		12 Months Ended		45 Months Ended
	Jan. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Nov. 30, 2023 USD ($) mi² term	Sep. 30, 2023 USD ($)	Jul. 31, 2023 USD ($)	Apr. 30, 2023 USD ($) city county	Oct. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Feb. 28, 2021 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Mar. 31, 2024 USD ($) county	Mar. 31, 2023 USD ($) county	Dec. 31, 2026 USD ($)	Sep. 21, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)	Sep. 30, 2021 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Prepayments received												$ 122,212	$ 60,759				$ 54,678
Broadband licenses granted, number of counties | county												28	84
Payments to acquire intangible assets												$ 17,031	$ 25,004
Increase in deposit assets										$ 7,500		7,500
Spectrum revenue												4,191	1,919
Contingent liability									$ 20,000			15,000	0
Stock repurchase program, authorized amount															$ 250,000			$ 50,000
SDG&E
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Consideration transferred									$ 50,000
Spectrum revenue
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Spectrum revenue												4,191	1,919
Tampa Electric Company | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Agreement term			20 years
Number of agreement extension terms | term			2
Agreement extension term			10 years
Service area | mi²			2,000
Total scheduled prepayments			$ 34,500
Prepayments received		$ 6,900								6,900
Lower Colorado River Authority (LCRA) | Wireless Licenses
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Broadband licenses granted, number of counties | county						68
Broadband licenses granted, minimum number of cities | city						30
Payments to acquire intangible assets						$ 30,000
Lower Colorado River Authority (LCRA) | Wireless Licenses | Forecast
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Payments to acquire intangible assets														$ 30,000
Lower Colorado River Authority (LCRA) | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Initial payment received										$ 15,000		15,000
Xcel Energy | Spectrum revenue
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Spectrum revenue												1,887	$ 0
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Agreement term							20 years
Agreement extension term							10 years
Total scheduled prepayments							$ 80,000
Prepayments received												$ 67,100				$ 8,000
Milestone payment received			$ 21,200		$ 21,200
Advance payment received	$ 16,800
SDG&E | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone payment received		$ 200		$ 25,200				$ 200
Delivery delay adjustments				$ 1,100							$ 1,100

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