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v3.25.1

Segment Information - Schedule of Information on Products and Services (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Disclosure of products and services [line items] |  |  |  |
Net revenue | $ 22,695,909 | $ 692,159 | $ 21,356,228 | $ 23,517,064
Percentage of total revenue | 100.00% | 100.00% | 100.00% | 100.00%
Testing [member] |  |  |  |
Disclosure of products and services [line items] |  |  |  |
Net revenue | $ 4,967,849 |  | $ 4,394,726 | $ 5,243,997
Percentage of total revenue | 22.00% | 22.00% | 20.00% | 22.00%
Assembly [member] |  |  |  |
Disclosure of products and services [line items] |  |  |  |
Net revenue | $ 5,390,447 |  | $ 4,629,430 | $ 6,705,898
Percentage of total revenue | 24.00% | 24.00% | 22.00% | 29.00%
LCDD [member] |  |  |  |
Disclosure of products and services [line items] |  |  |  |
Net revenue | $ 7,318,997 |  | $ 7,821,640 | $ 7,288,642
Percentage of total revenue | 32.00% | 32.00% | 37.00% | 31.00%
Bumping [member] |  |  |  |
Disclosure of products and services [line items] |  |  |  |
Net revenue | $ 5,018,616 |  | $ 4,510,432 | $ 4,278,527
Percentage of total revenue | 22.00% | 22.00% | 21.00% | 18.00%

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