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v3.22.1

Equity - Summary of Treasury Shares (Detail) shares in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 shares
Beginning balance | 72,941
Addition | 53,067
Ending balance | 126,008
Shares repurchased for cancellation [member] |
Beginning balance | 0
Addition | 53,067
Ending balance | 53,067
Shares held by subsidiaries [member] |
Beginning balance | 72,941
Addition | 0
Ending balance | 72,941

X
- Definition Number of treasury shares repurchase. + References No definition available. + Details
Name: | asx_NumberOfTreasurySharesRepurchase
Namespace Prefix: | asx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Purchase of treasury shares shares. + References No definition available. + Details
Name: | asx_PurchaseOfTreasurySharesShares
Namespace Prefix: | asx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_ComponentsOfEquityAxis=asx_SharesRepurchasedForCancellationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ComponentsOfEquityAxis=asx_SharesHeldBySubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |