Nature of Operations and Basis of Presentation - Narrative (Details) $ / shares in Units, $ in Thousands, people in Millions, customer in Millions						1 Months Ended		3 Months Ended		9 Months Ended
	Oct. 28, 2022 USD ($) term customer	May 30, 2022 shares	May 18, 2022 $ / shares shares	Sep. 30, 2014 USD ($)	Sep. 15, 2014 USD ($)	Sep. 30, 2021 USD ($) term people	Feb. 28, 2021 USD ($) people	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2022 USD ($) county	Dec. 31, 2021 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2022 USD ($)
Conversion of Stock [Line Items]
Prepayments received								$ 61,367		$ 61,367			$ 54,678
Number of people covered by network | people							3.6
Lease extension						10 years
Broadband licenses granted, number of counties | county										70
Spectrum revenues								578	$ 385	$ 1,311	$ 749
Contingent liability							$ 20,000	0		0			20,000
Shares issued on conversion (in shares) | shares		500,000	500,000
Shares converted (in shares) | shares			500,000
Prepaid expenses and other current assets								$ 14,957		$ 14,957			$ 10,147
Conversion price (in dollars per share) | $ / shares			$ 20.00
Forecast
Conversion of Stock [Line Items]
Contingent liability												$ 30,000
SDG&E
Conversion of Stock [Line Items]
Consideration transferred							$ 50,000
Minimum
Conversion of Stock [Line Items]
Term of contract						40 years
Lease extension								3 years		3 years
Evergy
Conversion of Stock [Line Items]
Number of people covered by network | people						3.9
Number of renewal terms | term						2
Term of contract						20 years
Scheduled prepayments						$ 30,200
Xcel Energy Services Inc. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Conversion of Stock [Line Items]
Agreement term	20 years
Number of agreement extensions | term	2
Agreement extension term	10 years
Total scheduled prepayments	$ 80,000
Prepayments received								$ 8,000		$ 8,000
Common Class B | Pdv Spectrum Holding Company Llc
Conversion of Stock [Line Items]
Equity method investee, cumulative proceeds received on all transactions				$ 10,000	$ 10,000
Spectrum revenue
Conversion of Stock [Line Items]
Prepaid expenses and other current assets				$ 7,500
Spectrum revenue | Evergy
Conversion of Stock [Line Items]
Spectrum revenues								$ 244	$ 0	$ 308	$ 0
Electricity | Xcel Energy Services Inc. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Conversion of Stock [Line Items]
Number of customers | customer	3.7
Natural Gas | Xcel Energy Services Inc. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Conversion of Stock [Line Items]
Number of customers | customer	2.1