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Consolidated Statements of Comprehensive Income
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
TWD ($)
$ / shares
Dec. 31, 2023
USD ($)
$ / shares
Dec. 31, 2022
TWD ($)
$ / shares
Dec. 31, 2021
TWD ($)
$ / shares
Statement of comprehensive income [abstract]        
Operating revenues $ 222,533,000 $ 7,267,570 $ 278,705,264 $ 213,011,018
Operating costs (144,789,162) (4,728,581) (152,940,887) (140,961,389)
Gross profit 77,743,838 2,538,989 125,764,377 72,049,629
Operating expenses        
Sales and marketing expenses (3,225,154) (105,328) (4,182,929) (4,671,599)
General and administrative expenses (7,477,037) (244,188) (9,672,613) (7,989,860)
Research and development expenses (13,283,830) (433,829) (12,953,534) (12,934,836)
Expected credit impairment gains (losses) 130,518 4,263 (2,723) 6,121
Subtotal (23,855,503) (779,082) (26,811,799) (25,590,174)
Net other operating income and expenses 4,002,326 130,709 5,339,647 5,226,831
Operating income 57,890,661 1,890,616 104,292,225 51,686,286
Non-operating income and expenses        
Interest income 4,853,124 158,495 2,022,314 575,719
Other income 1,773,498 57,920 2,163,043 1,653,006
Other gains and losses 223,096 7,286 (1,134,540) 866,130
Finance costs (1,570,374) (51,286) (1,866,329) (1,962,930)
Share of profit or loss of associates and joint ventures 4,307,614 140,680 1,626,103 5,193,495
Bargain purchase gain in acquisition of equity investee 494,001 16,133 0 0
Exchange gain, net 478,784 15,636 2,522,844 484,726
Subtotal 10,559,743 344,864 5,333,435 6,810,146
Income from continuing operations before income tax 68,450,404 2,235,480 109,625,660 58,496,432
Income tax expense (8,311,270) (271,433) (19,326,895) (7,918,252)
Net income 60,139,134 1,964,047 90,298,765 50,578,180
Items that will not be reclassified subsequently to profit or loss        
Remeasurements of defined benefit pension plans 402,234 13,136 296,804 (197,477)
Unrealized gains or losses from equity instruments investments measured at fair value through other comprehensive income 5,530,359 180,612 (4,646,064) 5,811,342
Share of other comprehensive income (loss) of associates and joint ventures which will not be reclassified subsequently to profit or loss 1,610,116 52,584 (1,694,965) 2,959,130
Income tax related to items that will not be reclassified subsequently (414,395) (13,533) (6,999) (417,076)
Subtotal 7,128,314 232,799 (6,051,224) 8,155,919
Items that may be reclassified subsequently to profit or loss        
Exchange differences on translation of foreign operations (2,386,278) (77,932) 9,292,308 (4,741,016)
Share of other comprehensive income (loss) of associates and joint ventures which may be reclassified subsequently to profit or loss (74,418) (2,430) 91,442 (24,412)
Income tax related to items that may be reclassified subsequently 390,428 12,751 859,566 29,938
Subtotal (2,070,268) (67,611) 10,243,316 (4,735,490)
Total other comprehensive income (loss) 5,058,046 165,188 4,192,092 3,420,429
Total comprehensive income (loss) 65,197,180 2,129,235 94,490,857 53,998,609
Net income (loss) attributable to:        
Shareholders of the parent 59,688,950 1,949,345 89,478,805 51,246,425
Non-controlling interests 450,184 14,702 819,960 (668,245)
Net income 60,139,134 1,964,047 90,298,765 50,578,180
Comprehensive income (loss) attributable to:        
Shareholders of the parent 64,747,010 2,114,533 93,670,889 54,666,873
Non-controlling interests 450,170 14,702 819,968 (668,264)
Total comprehensive income (loss) $ 65,197,180 $ 2,129,235 $ 94,490,857 $ 53,998,609
Earnings per share (NTD)        
Earnings per share-basic | (per share) $ 4.92 $ 0.16 $ 7.4 $ 4.27
Earnings per share-diluted | (per share) $ 4.82 $ 0.16 $ 7.16 $ 4.19