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SUMMARY OF MATERIAL ACCOUNTING POLICIES - Segment information (Details)	12 Months Ended
	Dec. 31, 2025 area
SIGNIFICANT ACCOUNTING POLICIES
Number of geographical areas reporting revenue	4

X

- Definition

The number of geographical areas reporting revenue.

+ References

No definition available.

+ Details

Name:	as_NumberOfGeographicalAreasReportingRevenue
Namespace Prefix:	as_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Not applicable.

+ References

No definition available.

+ Details

Name:	as_SignificantAccountingPoliciesDisclosureAbstract
Namespace Prefix:	as_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration