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Inventories Related to Real Estate Business - Additional Information (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($)
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Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |
Inventories related to real estate business expected to be recovered longer than twelve months | $ 11,416,726 | $ 381,703 | $ 10,060,608

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- Definition Inventories related to real estate business expected to be recovered. + References No definition available. + Details
Name: | asx_InventoriesRelatedToRealEstateBusinessNoncurrent
Namespace Prefix: | asx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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