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Equity - Summary of Shares Held By Subsidiaries (Detail) shares in Thousands, $ in Thousands, $ in Thousands | Dec. 31, 2021 TWD ($) shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 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 | $ 70,624 | $ 1,959,107
ASE Test Limited [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Shares Held By Subsidiaries (in thousands) | 44,100 | 44,100 | 44,100
Shares Held By Subsidiaries, Value | $ 1,380,721 | $ 49,774 | $ 1,380,721
J & R Holding Limited [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Shares Held By Subsidiaries (in thousands) | 23,352 | 23,352 | 23,352
Shares Held By Subsidiaries, Value | $ 381,709 | $ 13,760 | $ 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 | $ 7,090 | $ 196,677
Fair value [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Shares Held By Subsidiaries, Value | 7,768,270 | 280,039 | 5,930,144
Fair value [member] | ASE Test Limited [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Shares Held By Subsidiaries, Value | 4,696,675 | 169,311 | 3,585,349
Fair value [member] | J & R Holding Limited [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Shares Held By Subsidiaries, Value | 2,486,975 | 89,653 | 1,898,508
Fair value [member] | ASE Test, Inc. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Shares Held By Subsidiaries, Value | $ 584,620 | $ 21,075 | $ 446,287

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