v3.24.1
Operating Segments Information - Summary of Segment Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2023
USD ($)
Disclosure of operating segments [line items]          
Operating revenue $ 581,914,471 $ 19,004,392 $ 670,872,643 $ 569,997,133  
Interest income 1,513,407 49,425 654,747 542,329  
Interest expense (6,238,910) (203,753) (3,989,134) (2,798,935)  
Depreciation and amortization (58,101,863) (1,897,513) (55,451,889) (54,524,277)  
Share of the profit or loss of associates and joint ventures 1,080,600 35,291 1,185,377 899,700  
Impairment loss (146,570) (4,787) (388,775) (126,766)  
Segment profit before income tax 42,611,823 1,391,634 81,763,628 80,193,769  
Expenditures for segment assets 48,758,649 1,592,379 75,800,574 74,417,541  
Investments accounted for using the equity method 19,610,611   14,679,346 16,996,600 $ 640,451
Contract assets 5,100,076   5,731,173 5,607,209 166,560
Packaging segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 256,805,887 8,386,868 303,947,502 272,543,899  
Interest income 188,704 6,163 109,148 61,141  
Interest expense (2,907,679) (94,960) (2,150,382) (1,604,107)  
Depreciation and amortization (34,110,372) (1,113,990) (33,509,358) (34,384,500)  
Share of the profit or loss of associates and joint ventures 916,310 29,925 779,474 737,650  
Impairment loss (81,133) (2,650) (64,257) (86,997)  
Segment profit before income tax 25,405,636 829,707 51,824,439 41,581,126  
Expenditures for segment assets 27,881,152 910,554 45,936,563 48,531,368  
Investments accounted for using the equity method 15,091,563   10,341,203 12,744,756 492,866
Contract assets 4,066,174   4,869,541 4,735,181 132,795
Testing segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 49,879,923 1,628,998 55,960,182 49,978,736  
Interest income 124,443 4,064 84,562 88,874  
Interest expense (720,145) (23,519) (463,043) (405,648)  
Depreciation and amortization (16,173,653) (528,206) (14,901,939) (13,819,080)  
Share of the profit or loss of associates and joint ventures 134,667 4,398 81,627 66,107  
Impairment loss (65,437) (2,137) (105,169) (39,769)  
Segment profit before income tax 9,369,875 306,005 14,626,156 11,998,938  
Expenditures for segment assets 13,664,416 446,258 21,765,965 16,773,513  
Investments accounted for using the equity method 2,338,125   1,643,940 1,896,372 76,360
Contract assets 1,033,902   861,632 872,028 33,765
EMS segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 268,218,002 8,759,569 301,966,818 239,488,267  
Interest income 1,087,121 35,504 418,507 301,072  
Interest expense (1,816,814) (59,334) (1,029,128) (629,584)  
Depreciation and amortization (5,335,496) (174,249) (4,654,383) (4,336,266)  
Share of the profit or loss of associates and joint ventures 38,211 1,248 324,276 95,943  
Impairment loss     (219,349)    
Segment profit before income tax 9,216,053 300,982 14,368,179 8,528,675  
Expenditures for segment assets 6,207,532 202,728 6,188,401 7,654,560  
Investments accounted for using the equity method 2,160,112   2,694,203 2,355,472 70,546
All other segments [member]          
Disclosure of operating segments [line items]          
Operating revenue 7,010,659 228,957 8,998,141 7,986,231  
Interest income 113,139 3,694 42,530 91,242  
Interest expense (794,272) (25,940) (346,581) (159,596)  
Depreciation and amortization (2,482,342) (81,068) (2,386,209) (1,984,431)  
Share of the profit or loss of associates and joint ventures (8,588) (280)      
Segment profit before income tax (1,379,741) (45,060) 944,854 18,085,030  
Expenditures for segment assets 1,005,549 32,839 1,909,645 1,458,100  
Investments accounted for using the equity method 20,811       $ 679
Inter-group revenues [member] | Packaging segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 4,550,622 148,616 6,940,878 7,244,889  
Inter-group revenues [member] | Testing segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 447,279 14,607 524,387 339,619  
Inter-group revenues [member] | EMS segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 26,639,833 870,014 35,533,226 27,825,073  
Inter-group revenues [member] | All other segments [member]          
Disclosure of operating segments [line items]          
Operating revenue 6,776,002 221,294 9,080,132 7,527,260  
Inter-group revenues [member] | Adjustments and Eliminations [member]          
Disclosure of operating segments [line items]          
Operating revenue (38,413,736) (1,254,531) (52,078,623) (42,936,841)  
Operating segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 620,328,207 20,258,923 722,951,266 612,933,974  
Operating segment [member] | Packaging segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 261,356,509 8,535,484 310,888,380 279,788,788  
Operating segment [member] | Testing segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 50,327,202 1,643,606 56,484,569 50,318,355  
Operating segment [member] | EMS segment [member]          
Disclosure of operating segments [line items]          
Operating revenue 294,857,835 9,629,583 337,500,044 267,313,340  
Operating segment [member] | All other segments [member]          
Disclosure of operating segments [line items]          
Operating revenue $ 13,786,661 $ 450,250 $ 18,078,273 $ 15,513,491