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Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Total spectrum revenue	$ 1,552	$ 1,551	$ 2,970	$ 3,076
Spectrum revenue | Ameren Corporation
Disaggregation of Revenue [Line Items]
Total spectrum revenue	206	182	412	338
Spectrum revenue | Evergy
Disaggregation of Revenue [Line Items]
Total spectrum revenue	385	385	770	771
Spectrum revenue | Xcel Energy
Disaggregation of Revenue [Line Items]
Total spectrum revenue	884	802	1,685	1,603
Spectrum revenue | TECO
Disaggregation of Revenue [Line Items]
Total spectrum revenue	77	0	103	0
Spectrum revenue | Motorola
Disaggregation of Revenue [Line Items]
Total spectrum revenue	$ 0	$ 182	$ 0	$ 364

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