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Intangible Assets - Schedule of Activity (Details) - USD ($) $ in Thousands | 6 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Indefinite-Lived Intangible Assets [Roll Forward] |  |
Beginning balance | $ 202,044 |
Ending balance | 197,566 |
Wireless Licenses |  |
Indefinite-Lived Intangible Assets [Roll Forward] |  |
Beginning balance | 202,044 |
Acquisitions | 8,022 |
Amount disposed | (31,798) |
Exchanges – licenses received | 24,146 | $ 4,900
Exchanges – licenses surrendered | (4,848) | $ 1,300
Ending balance | $ 197,566 |

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- Definition Indefinitelived Intangible Assets, Exchanged Licenses Received + References No definition available. + Details
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Namespace Prefix: | atex_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Indefinitelived Intangible Assets, Exchanged Licenses Surrendered + References No definition available. + Details
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Namespace Prefix: | atex_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Amount of divestiture of an asset lacking physical substance and having a projected indefinite period of benefit to fair value. Excludes financial assets and goodwill. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
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- Definition Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, from an acquisition. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |