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Factoring of Accounts Receivable (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Total Factored
Factoring of Accounts Receivable [Line Items]
Accounts receivable sold	$ 63.2	$ 23.3	$ 88.7	$ 59.4

X

- Definition

Accounts Receivable Sold without Recourse

+ References

No definition available.

+ Details

Name:	amkr_AccountsReceivableSoldwithoutRecourse
Namespace Prefix:	amkr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

[Line Items] for Factoring of Accounts Receivable [Table]

+ References

No definition available.

+ Details

Name:	amkr_FactoringofAccountsReceivableLineItems
Namespace Prefix:	amkr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	amkr_FactoringofAccountsReceivableAxis=amkr_TotalFactoredMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: