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v3.19.1

Others - Additional Information (Detail) $ in Thousands | Dec. 20, 2013 TWD ($)
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Disclosure Detailed Information About Others [abstract] |
Administrative fine imposed | $ 102,014

X
- Definition Amount of fine imposed. + References No definition available. + Details
Name: | asx_AmountOfFineImposed
Namespace Prefix: | asx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Disclosure Detailed Information About Others [abstract] + References No definition available. + Details
Name: | asx_DisclosureDetailedInformationAboutOthersAbstract
Namespace Prefix: | asx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration