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Nature of Operations (Details) $ / shares in Units, $ in Thousands, people in Millions, customer in Millions					1 Months Ended				12 Months Ended
	Oct. 28, 2022 USD ($) customer term	May 30, 2022 shares	May 18, 2022 $ / shares shares	Sep. 15, 2014 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($) people	Feb. 28, 2021 USD ($) people	Dec. 31, 2020 USD ($) people	Mar. 31, 2023 USD ($) county	Mar. 31, 2022 USD ($) county	Mar. 31, 2021 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2014 USD ($)
Lessor, Lease, Description [Line Items]
Prepayments received									$ 60,759	$ 54,678	$ 2,983
Number of people covered by network | people							3.6	7.5
Lease term								30 years
Lease extension						10 years		10 years
Scheduled prepayments								$ 47,700
Broadband licenses granted, number of countries | county									84	21
Total operating revenues									$ 1,919	$ 1,084	921
Contingent liability							$ 20,000		0	20,000
Sale of stock (in shares) | shares		500,000	500,000
Shares converted (in shares) | shares			500,000
Prepaid expenses and other current assets									$ 16,277	10,147
Conversion price (in dollars per share) | $ / shares			$ 20.00
Common Class B Units | PDV Spectrum Holding Company, LLC
Lessor, Lease, Description [Line Items]
Equity method investee, cumulative proceeds received on all transactions				$ 10,000
Forecast
Lessor, Lease, Description [Line Items]
Contingent liability												$ 30,000
SDG&E
Lessor, Lease, Description [Line Items]
Consideration transferred							$ 50,000
Minimum
Lessor, Lease, Description [Line Items]
Lease extension									3 years
Spectrum revenue
Lessor, Lease, Description [Line Items]
Total operating revenues									$ 1,919	1,084	729
Prepaid expenses and other current assets														$ 7,500
Xcel Energy Services Inc. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Lessor, Lease, Description [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
Xcel Energy Services Inc. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Electricity
Lessor, Lease, Description [Line Items]
Number of customers | customer	3.7
Xcel Energy Services Inc. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Natural Gas
Lessor, Lease, Description [Line Items]
Number of customers | customer	2.1
Evergy
Lessor, Lease, Description [Line Items]
Number of people covered by network | people						3.9
Lease term						20 years
Scheduled prepayments						$ 30,200
Broadband licenses granted, number of countries | county									81
Evergy | Spectrum revenue
Lessor, Lease, Description [Line Items]
Total operating revenues									$ 581	$ 0	$ 0
SDG&E | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement
Lessor, Lease, Description [Line Items]
Milestone payment received					$ 200

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