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Supplemental Disclosure of Cash Flow Information - Narrative (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2023 USD ($) county	Mar. 31, 2022 USD ($) county	Mar. 31, 2021 USD ($)
Supplemental Cash Flow Elements [Abstract]
Broadband licenses granted, number of countries | county	84	21
Gain (loss) from disposal of intangible assets, net | $	$ 38,399	$ 11,209	$ (3,849)

X

- Definition

Broadband Licenses Granted, Number of Counties

+ References

No definition available.

+ Details

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Namespace Prefix:	atex_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of gain (loss) on sale or disposal of intangible assets.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

+ Details

Name:	us-gaap_GainLossOnDispositionOfIntangibleAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration