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v3.23.1

Segment Information - Financial Segment Information for Operating Segments (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2022 TWD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 TWD ($) | Dec. 31, 2020 TWD ($)
Revenue |  |  |  |
Revenue | $ 23,517,064 | $ 765,280 | $ 27,400,035 | $ 23,011,381
Operating profit (loss) | 3,216,679 | 104,676 | 5,562,389 | 3,566,502
Depreciation expenses | (4,751,902) |  | (4,634,112) | (4,175,519)
Share of profit (loss) of associates | 453,715 | 14,765 | 625,733 | (147,329)
Interest income | 57,199 | $ 1,861 | 9,980 | 27,778
Interest expense | (142,439) |  | (120,998) | (162,400)
Purchase of property, plant and equipment | 4,918,482 |  | 6,552,702 | 4,133,615
External [member] |  |  |  |
Revenue |  |  |  |
Revenue |  |  | 27,400,035 | 23,011,381
Operating segments [member] | Testing [member] |  |  |  |
Revenue |  |  |  |
Revenue | 5,243,997 |  | 5,899,600 | 5,002,730
Operating profit (loss) | 1,253,477 |  | 1,814,021 | 1,333,682
Depreciation expenses | (1,042,455) |  | (921,999) | (853,829)
Purchase of property, plant and equipment | 1,086,682 |  | 1,841,359 | 887,204
Operating segments [member] | Testing [member] | External [member] |  |  |  |
Revenue |  |  |  |
Revenue | 5,243,997 |  | 5,899,600 | 5,002,730
Operating segments [member] | Assembly [member] |  |  |  |
Revenue |  |  |  |
Revenue | 6,705,898 |  | 7,963,714 | 6,001,964
Operating profit (loss) | (93,585) |  | 857,304 | 67,730
Depreciation expenses | (694,835) |  | (576,138) | (523,341)
Purchase of property, plant and equipment | 957,790 |  | 1,553,475 | 803,693
Operating segments [member] | Assembly [member] | External [member] |  |  |  |
Revenue |  |  |  |
Revenue | 6,705,898 |  | 7,963,714 | 6,001,964
Operating segments [member] | LCDD [member] |  |  |  |
Revenue |  |  |  |
Revenue | 7,288,642 |  | 8,211,099 | 7,023,003
Operating profit (loss) | 1,795,741 |  | 2,336,394 | 1,687,986
Depreciation expenses | (2,505,297) |  | (2,579,150) | (2,213,504)
Purchase of property, plant and equipment | 2,677,489 |  | 2,748,697 | 2,143,401
Operating segments [member] | LCDD [member] | External [member] |  |  |  |
Revenue |  |  |  |
Revenue | 7,288,642 |  | 8,211,099 | 7,023,003
Operating segments [member] | Bumping [member] |  |  |  |
Revenue |  |  |  |
Revenue | 4,278,527 |  | 5,325,622 | 4,983,684
Operating profit (loss) | 268,159 |  | 561,642 | 487,323
Depreciation expenses | (500,863) |  | (549,020) | (578,890)
Purchase of property, plant and equipment | 196,521 |  | 408,751 | 298,834
Operating segments [member] | Bumping [member] | External [member] |  |  |  |
Revenue |  |  |  |
Revenue | 4,278,527 |  | 5,325,622 | 4,983,684
Operating segments [member] | Others [member] |  |  |  |
Revenue |  |  |  |
Revenue | 50,600 |  | 43,808 | 39,646
Operating profit (loss) | (6,821) |  | (6,987) | (10,230)
Depreciation expenses | (8,452) |  | (7,805) | (5,955)
Share of profit (loss) of associates | 884,555 |  | 1,211,177 | (320,578)
Interest income | 57,199 |  | 9,980 | 27,778
Interest expense | (142,439) |  | (120,998) | (162,400)
Purchase of property, plant and equipment |  |  | 420 | 483
Operating segments [member] | Others [member] | Intersegment [member] |  |  |  |
Revenue |  |  |  |
Revenue | 50,600 |  | 43,808 | 39,646
Elimination [member] |  |  |  |
Revenue |  |  |  |
Revenue | (50,600) |  | (43,808) | (39,646)
Operating profit (loss) | (292) |  | 15 | 11
Share of profit (loss) of associates | (430,840) |  | (585,444) | 173,249
Elimination [member] | Intersegment [member] |  |  |  |
Revenue |  |  |  |
Revenue | $ (50,600) |  | (43,808) | $ (39,646)
Continuing operations [member] |  |  |  |
Revenue |  |  |  |
Interest income |  |  | $ 9,980 |

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