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Intangible Assets - Schedule of Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Indefinite-lived Intangible Assets [Roll Forward]
Beginning balance	$ 151,169
Ending balance	202,044	$ 151,169
Wireless Licenses
Indefinite-lived Intangible Assets [Roll Forward]
Beginning balance	151,169	122,117
Acquisitions	12,476	17,843
Exchanges - licenses received	46,174	15,341
Exchanges - licenses surrendered	(7,775)	(4,132)
Ending balance	$ 202,044	$ 151,169

X

- 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

X

- 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

X

- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- 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
Period Type:	duration

X

- 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

X

- Details

Name:	us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_LicensingAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: