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Leases - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2021	Dec. 31, 2020
Lease [Line Items]
Lease extension				10 years	10 years
Rent expense	$ 2.0	$ 2.6	$ 2.7
Cost of Revenue
Lease [Line Items]
Rent expense		1.2	1.7
Selling, General and Administrative Expenses
Lease [Line Items]
Rent expense		$ 1.4	$ 1.0
Minimum
Lease [Line Items]
Lease extension	3 years
Maximum
Lease [Line Items]
Lease extension	10 years

X

- Definition

Lease [Line Items]

+ References

No definition available.

+ Details

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Namespace Prefix:	atex_
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Balance Type:	na
Period Type:	duration

X

- Definition

Term of lessor's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919359-209981

+ Details

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

X

- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977

+ Details

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- Details

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- Details

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