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Supplemental Disclosure of Cash Flow Information - Narrative (Details) $ in Thousands | 12 Months Ended
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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)

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- Definition Broadband Licenses Granted, Number of Counties + References No definition available. + Details
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Namespace Prefix: | atex_
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Balance Type: | na
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- 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
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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