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Related Party Transactions - Summary of Transactions Between Related Parties (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Disclosure of transactions between related parties [line items] |  |  |  |
Amount contributed related party transactions | $ 112,500 | $ 3,431 | $ 125,000 | $ 120,000
ASE Environmental Protection And Sustainability Foundation [Member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Amount contributed related party transactions | 100,000 | 3,050 | 100,000 | 100,000
ASE Cultural and Educational Foundation [member] |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |
Amount contributed related party transactions | $ 12,500 | $ 381 | $ 25,000 | $ 20,000

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- Definition Amount contributed related party transactions. + References No definition available. + Details
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Namespace Prefix: | asx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=asx_AseEnvironmentalProtectionAndSustainabilityFoundationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=asx_ASECulturalAndEducationalFoundationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |