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Intangible Assets (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Mar. 31, 2021
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Initial Deposits |  | $ 5,400,000 |  | $ 5,400,000 |  | $ 2,300,000
Impairment charges |  | 0 | $ 0 | 0 | $ 0 |
Gain (Loss) on Disposition of Intangible Assets |  | 10,230,000 | $ 829,000 | 10,230,000 | $ (3,849,000) |
Wireless Licenses [Member] |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Asset Acquisition, Consideration Transferred |  |  |  | 8,800,000 |  |
Exchanges - broadband licenses received |  |  |  | 13,600,000 |  |
Exchanges - narrowband licenses surrendered |  |  |  | 3,400,000 |  |
Gain (Loss) on Disposition of Intangible Assets |  |  |  | 10,200,000 |  |
Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Initial Deposits |  | 4,800,000 |  | 4,800,000 |  | 1,900,000
Other Assets [Member] |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Initial Deposits |  | $ 600,000 |  | 600,000 |  | $ 500,000
Wireless Licenses [Member] |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Acquisitions |  |  |  | 8,769,000 |  |
Exchanges - broadband licenses received |  |  |  | 13,611,000 |  |
Exchanges - narrowband licenses surrendered |  |  |  | 3,381,000 |  |
SDG&E [Member] |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Asset Acquisition, Consideration Transferred | $ 50,000,000.0 |  |  |  |  |
Third Parties [Member] | Wireless Licenses [Member] |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Asset Acquisition, Consideration Transferred |  |  |  | 6,800,000 |  |
Anti-Windfall [Member] | Wireless Licenses [Member] |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Asset Acquisition, Consideration Transferred |  |  |  | $ 2,000,000.0 |  |

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