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Revenues - Schedule of Deferred Income and Customer Advances (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2025 USD ($)
Change in Contract with Customer, Liability [Roll Forward]
Opening balance	$ 37,538
Additional cash advances	0
Less amounts recognized in revenues	(35,680)
Ending balance	$ 1,858

X

- Definition

Change in Contract with Customer, Liability [Roll Forward]

+ References

No definition available.

+ Details

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X

- Definition

Contract with Customer, Liability, Additional Cash Advances

+ References

No definition available.

+ Details

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Namespace Prefix:	asix_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Contract with Customer, Liability, Revenue Recognized in Period

+ References

No definition available.

+ Details

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Namespace Prefix:	asix_
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Balance Type:	credit
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X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-11

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-2

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