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Intangible Assets - Narrative (Details)	1 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($)	Aug. 31, 2020 USD ($)	Mar. 31, 2023 USD ($) channel county	Mar. 31, 2022 USD ($) county	Mar. 31, 2021 USD ($)	Jan. 31, 2020 channel	Jan. 31, 2018 USD ($)
Acquired Indefinite-lived Intangible Assets [Line Items]
Impairment charges			$ 0	$ 0	$ 0
Broadband licenses granted, number of countries | county			84	21
Gain (loss) from disposal of intangible assets, net			$ 38,399,000	$ 11,209,000	(3,849,000)
Prepayments received			60,759,000	54,678,000	2,983,000
Intangible assets			$ 202,044,000	151,169,000
Number of narrowband 900 MHz channels subject to relocation | channel			3			3
Reprogramming
Acquired Indefinite-lived Intangible Assets [Line Items]
Gain (loss) from disposal of intangible assets, net		$ (300,000)
AAR
Acquired Indefinite-lived Intangible Assets [Line Items]
Gain (loss) from disposal of intangible assets, net					(4,700,000)
Number of narrowband 900 MHz channels licensed | channel			6
Wireless Licenses
Acquired Indefinite-lived Intangible Assets [Line Items]
Licenses received			$ 46,174,000	15,341,000
Licenses exchanged			7,775,000	4,132,000
Intangible assets			$ 202,044,000	$ 151,169,000	$ 122,117,000
Spectrum Licenses
Acquired Indefinite-lived Intangible Assets [Line Items]
Gain (loss) from disposal of intangible assets, net	$ 1,100,000
Estimated fair value	200,000
Proceeds from sale of intangible assets	1,200,000
Prepayments received	600,000						$ 600,000
Intangible assets	$ 300,000

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