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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

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- 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

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- 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

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