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Consolidated Statements of Comprehensive Income
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
$ / shares
Dec. 31, 2024
USD ($)
$ / shares
Dec. 31, 2023
TWD ($)
$ / shares
Dec. 31, 2022
TWD ($)
$ / shares
Consolidated statements of comprehensive income [Line Items]        
Revenue $ 22,695,909 $ 692,159 $ 21,356,228 $ 23,517,064
Cost of revenue (19,751,813) (602,373) (17,806,803) (18,605,007)
Gross profit 2,944,096 89,786 3,549,425 4,912,057
Sales and marketing expenses (128,733) (3,926) (135,661) (128,029)
General and administrative expenses (478,553) (14,594) (497,742) (538,684)
Research and development expenses (1,162,765) (35,461) (1,093,513) (1,158,598)
Other income (expenses), net 99,892 3,046 85,943 129,933
Operating profit 1,273,937 38,851 1,908,452 3,216,679
Interest income 197,719 6,030 193,189 57,199
Other income 58,089 1,771 77,583 66,991
Other gains and losses 393,565 12,003 135,501 386,567
Finance costs (278,940) (8,507) (266,390) (153,279)
Share of profit of associates and joint ventures accounted for using equity method 2,683 82 219,891 453,715
Profit before income tax 1,647,053 50,230 2,268,226 4,027,872
Income tax expense (207,517) (6,328) (300,661) (588,175)
Profit for the year 1,439,536 43,902 1,967,565 3,439,697
Other comprehensive income (loss):        
Profit on remeasurements of defined benefit plans 56,305 1,717 10,699 222,234
Unrealized loss on valuation of equity instruments at fair value through other comprehensive income (17,304) (528) (217,785) (46,419)
Share of other comprehensive (loss) income of associates and joint ventures accounted for using equity method that will not be reclassified to profit or loss 16,978 518 12,993 (28,254)
Income tax effect on components that will not be reclassified to profit or loss (7,803) (238) 49,498 (31,888)
Components of other comprehensive income (loss) that will not be reclassified to profit or loss 48,176 1,469 (144,595) 115,673
Exchange differences on translation of foreign operations 18,347 560 16,713 68,656
Equity directly related to non-current assets held for sale 43,094 1,314 (43,094)  
Components of other comprehensive income (loss) that will be reclassified to profit or loss 61,441 1,874 (26,381) 68,656
Other comprehensive income (loss), net of income tax 109,617 3,343 (170,976) 184,329
Total comprehensive income (loss) for the year $ 1,549,153 $ 47,245 $ 1,796,589 $ 3,624,026
Ordinary shares [member]        
Other comprehensive income (loss):        
Earnings per share - basic | (per share) $ 1.98 $ 0.06 $ 2.71 $ 4.73
Earnings per share - diluted | (per share) 1.96 0.06 2.68 4.63
American depositary share (each representing 20 common shares) [member]        
Other comprehensive income (loss):        
Earnings per share - basic | (per share) 39.59 1.21 54.11 94.6
Earnings per share - diluted | (per share) $ 39.22 $ 1.2 $ 53.54 $ 92.63