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Revenue - Disaggregation of Revenue (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2023 USD ($) county	Mar. 31, 2022 USD ($) county	Mar. 31, 2021 USD ($)
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 1,919	$ 1,084	$ 921
Broadband licenses granted, number of countries | county	84	21
Spectrum revenue
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 1,919	$ 1,084	729
Service revenue
Disaggregation of Revenue [Line Items]
Total operating revenues	0	0	192
Ameren | Spectrum revenue
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 609	355	0
Evergy
Disaggregation of Revenue [Line Items]
Broadband licenses granted, number of countries | county	81
Evergy | Spectrum revenue
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 581	0	0
Motorola | Spectrum revenue
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 729	$ 729	$ 729

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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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