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Equity - Summary of Shares Held By Subsidiaries (Detail) shares in Thousands, $ in Thousands, $ in Thousands | Dec. 31, 2022 TWD ($) shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 TWD ($) shares
--- | --- | --- | ---
Disclosure of subsidiaries [Line Items] |  |  |
Shares Held By Subsidiaries (in thousands) | 72,941 | 72,941 | 72,941
Shares Held By Subsidiaries, Value | $ 1,959,107 | $ 63,752 | $ 1,959,107
ASE Test Limited [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Shares Held By Subsidiaries (in thousands) |  |  | 44,100
Shares Held By Subsidiaries, Value | $ |  |  | $ 1,380,721
J & R Holding Limited [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Shares Held By Subsidiaries (in thousands) |  |  | 23,352
Shares Held By Subsidiaries, Value | $ |  |  | $ 381,709
ASE Test, Inc. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Shares Held By Subsidiaries (in thousands) | 5,489 | 5,489 | 5,489
Shares Held By Subsidiaries, Value | $ 196,677 | $ 6,400 | $ 196,677
ASE [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Shares Held By Subsidiaries (in thousands) | 67,452 | 67,452 |
Shares Held By Subsidiaries, Value | $ 1,762,430 | $ 57,352 |
Fair value [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Shares Held By Subsidiaries, Value | 6,849,208 | 222,884 | 7,768,270
Fair value [member] | ASE Test Limited [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Shares Held By Subsidiaries, Value | $ |  |  | 4,696,675
Fair value [member] | J & R Holding Limited [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Shares Held By Subsidiaries, Value | $ |  |  | 2,486,975
Fair value [member] | ASE Test, Inc. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Shares Held By Subsidiaries, Value | 515,454 | 16,774 | $ 584,620
Fair value [member] | ASE [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Shares Held By Subsidiaries, Value | $ 6,333,754 | $ 206,110 |

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