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Revenue - Disaggregation of Revenue (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) county	Sep. 30, 2021 USD ($)
Disaggregation of Revenue [Line Items]
Spectrum revenues	$ 398	$ 182	$ 733	$ 364
Broadband licenses granted, number of counties | county			45
Spectrum revenue | Ameren
Disaggregation of Revenue [Line Items]
Spectrum revenues	152	0	$ 305	0
Spectrum revenue | Evergy
Disaggregation of Revenue [Line Items]
Spectrum revenues	64	0	64	0
Spectrum revenue | Motorola
Disaggregation of Revenue [Line Items]
Spectrum revenues	$ 182	$ 182	$ 364	$ 364

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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