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Supplemental Disclosure of Cash Flow Information - Narrative (Details) - county | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Supplemental Cash Flow Elements [Abstract] |  |
Broadband licenses granted, number of counties | 67 | 28

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- Definition Broadband Licenses Granted, Number of Counties + References No definition available. + Details
Name: | atex_BroadbandLicensesGrantedNumberOfCounties
Namespace Prefix: | atex_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_SupplementalCashFlowElementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration