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Intangible Assets - Narrative (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Aug. 31, 2020 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2022 USD ($) country | Mar. 31, 2022 USD ($) county | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Jan. 31, 2018 USD ($)
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Impairment charges |  |  | $ 0 |  |  | $ 0 | $ 0 |
Acquisitions |  |  | 17,800,000 |  |  | 15,600,000 |  |
Initial deposits |  |  | 8,000,000 | $ 8,000,000 | $ 8,000,000 | 2,300,000 |  |
Prepaid expenses and other current assets |  |  | 10,147,000 | 10,147,000 | 10,147,000 | 3,508,000 |  |
Other assets |  |  | 4,108,000 | 4,108,000 | 4,108,000 | 1,214,000 |  |
Gain (loss) from disposal of intangible assets, net |  |  | 11,209,000 |  |  | (3,849,000) | (88,000) |
Contract liability |  |  | 54,678,000 | 54,678,000 | 54,678,000 | 2,983,000 | 3,462,000 |
Book value |  |  | 151,169,000 | 151,169,000 | 151,169,000 | 122,117,000 |  |
Property and equipment, net |  |  | 2,949,000 | $ 2,949,000 | $ 2,949,000 | 3,574,000 |  |
Cash |  |  |  |  |  |  | 15,000 |
Wireless licenses |  |  |  |  |  |  | 88,000 |
Gain on agreement |  |  |  |  |  |  | 52,000 |
Broadband licenses granted, number of countries |  |  |  | 21 | 21 |  |  |
AAR |  |  |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Gain (loss) from disposal of intangible assets, net |  |  |  |  |  | (4,700,000) |  |
Equipment |  |  |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Property and equipment, net |  |  |  |  |  |  | 21,000 |
Prepaid Expenses and Other Current Assets |  |  |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Initial deposits |  |  | 7,600,000 | $ 7,600,000 | $ 7,600,000 | 1,900,000 |  |
Other Assets |  |  |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Initial deposits |  |  | 400,000 | 400,000 | 400,000 | 400,000 |  |
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 |  |  |  |  |  |  |
Payment | 1,200,000 |  |  |  |  |  |  |
Contract liability | 600,000 |  |  |  |  |  |  | $ 600,000
Book value | $ 300,000 |  |  |  |  |  |  |
Wireless Licenses |  |  |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Acquisitions |  |  | 17,843,000 |  |  | 15,640,000 |  |
Book value |  |  | 151,169,000 | 151,169,000 | 151,169,000 | 122,117,000 | $ 111,526,000 |
Exchanges - licenses received |  |  | 15,341,000 |  |  | 196,000 |  |
Exchanges - licenses surrendered |  |  | (4,132,000) |  |  | (262,000) |  |
Reprogramming |  |  |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Gain (loss) from disposal of intangible assets, net |  | $ (300,000) |  |  |  |  |  |
In Process Deals |  |  |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Prepaid expense and other assets |  |  | 3,400,000 | 3,400,000 | 3,400,000 | 400,000 |  |
Prepaid expenses and other current assets |  |  | 200,000 | 200,000 | 200,000 | 100,000 |  |
Other assets |  |  | $ 3,100,000 | $ 3,100,000 | $ 3,100,000 | $ 300,000 |  |

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