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

X

- 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