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v3.20.1

Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | $ 214,592,588 |  |  |
Depreciation expense | 45,240,667 | $ 1,512,560 | $ 39,893,786 | $ 28,625,287
Additions | 63,073,887 | 2,108,789 | 39,092,238 | 23,677,682
Ending balance | 232,093,327 | 7,759,723 | 214,592,588 |
Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 535,004,044 | 17,887,129 | 370,320,242 | 364,012,147
Additions | 63,073,887 | 2,108,789 | 39,092,238 | 23,677,682
Disposals | (22,630,764) | (756,629) | (29,456,450) | (9,896,428)
Reclassification | 745,331 | 24,919 | (14,891) | (474,352)
Acquisition through business combinations | 7,034,875 | 235,202 | 156,721,779 |
Effect of foreign currency exchange differences | (6,782,466) | (226,762) | (1,200,829) | (6,998,807)
Ending balance | 576,444,907 | 19,272,648 | 535,004,044 | 370,320,242
Cost [member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 535,462,089 |  |  |
Ending balance | 535,462,089 | 17,902,443 | 535,462,089 |
Cost [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | (458,045) | (15,314) |  |
Ending balance |  |  | (458,045) |
Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 320,688,535 | 10,721,783 | 235,151,836 | 220,131,906
Depreciation expense | 45,240,667 | 1,512,560 | 39,893,786 | 28,625,287
Impairment losses recognized | 201,006 | 6,720 | 133,071 | 289,558
Disposals | (22,024,853) | (736,371) | (28,266,113) | (8,757,164)
Reclassification | 294,232 | 9,838 | (265) | (199,745)
Acquisition through business combinations | 4,465,048 | 149,283 | 74,736,157 |
Effect of foreign currency exchange differences | (4,513,055) | (150,888) | (778,971) | (4,938,006)
Ending balance | 344,351,580 | 11,512,925 | 320,688,535 | 235,151,836
Accumulated depreciation, amortisation and impairment [member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 320,869,501 |  |  |
Ending balance | 320,869,501 | 10,723,833 | 320,869,501 |
Accumulated depreciation, amortisation and impairment [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | (180,966) | (6,050) |  |
Ending balance |  |  | (180,966) |
Land [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 10,165,969 |  |  |
Ending balance | 10,333,822 | 345,497 | 10,165,969 |
Land [member] | Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 10,165,969 | 339,885 | 3,258,518 | 3,365,013
Reclassification |  |  |  | (35,965)
Acquisition through business combinations | 189,111 | 6,323 | 6,880,400 |
Effect of foreign currency exchange differences | (21,258) | (711) | 27,051 | (70,530)
Ending balance | 10,333,822 | 345,497 | 10,165,969 | 3,258,518
Land [member] | Cost [member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 10,165,969 |  |  |
Ending balance | 10,165,969 | 339,885 | 10,165,969 |
Buildings and improvements [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 78,963,937 |  |  |
Ending balance | 85,409,580 | 2,855,553 | 78,963,937 |
Buildings and improvements [member] | Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 141,708,011 | 4,737,814 | 100,187,928 | 96,258,175
Additions | 806,844 | 26,976 | 144,898 | 350,434
Disposals | (983,690) | (32,888) | (677,206) | (609,294)
Reclassification | 13,601,469 | 454,746 | 5,388,709 | 6,483,392
Acquisition through business combinations | 1,044,383 | 34,917 | 37,127,957 |
Effect of foreign currency exchange differences | (2,204,057) | (73,689) | (464,275) | (2,294,779)
Ending balance | 153,972,960 | 5,147,876 | 141,708,011 | 100,187,928
Buildings and improvements [member] | Cost [member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 141,708,011 |  |  |
Ending balance | 141,708,011 | 4,737,814 | 141,708,011 |
Buildings and improvements [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 62,744,074 | 2,097,762 | 41,915,064 | 38,229,544
Depreciation expense | 6,989,392 | 233,681 | 6,325,948 | 5,156,558
Impairment losses recognized | 78,562 | 2,626 | 29,531 | 2,310
Disposals | (881,149) | (29,460) | (491,033) | (478,903)
Reclassification | 210,558 | 7,040 | (265) | (210,080)
Acquisition through business combinations | 445,682 | 14,901 | 15,097,920 |
Effect of foreign currency exchange differences | (1,023,739) | (34,227) | (133,091) | (784,365)
Ending balance | 68,563,380 | 2,292,323 | 62,744,074 | 41,915,064
Buildings and improvements [member] | Accumulated depreciation, amortisation and impairment [member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 62,744,074 |  |  |
Ending balance | 62,744,074 | 2,097,762 | 62,744,074 |
Machinery and equipment1 [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 108,087,970 |  |  |
Ending balance | 112,996,670 | 3,777,889 | 108,087,970 |
Machinery and equipment1 [member] | Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 353,838,390 | 11,830,103 | 253,198,003 | 248,200,756
Additions | 413,008 | 13,808 | 192,673 | 102,301
Disposals | (19,139,634) | (639,908) | (26,493,282) | (8,449,949)
Reclassification | 41,302,651 | 1,380,898 | 32,060,513 | 18,331,738
Acquisition through business combinations | 5,507,315 | 184,130 | 95,810,062 |
Effect of foreign currency exchange differences | (5,176,282) | (173,062) | (929,579) | (4,986,843)
Ending balance | 376,745,448 | 12,595,969 | 353,838,390 | 253,198,003
Machinery and equipment1 [member] | Cost [member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 353,838,390 |  |  |
Ending balance | 353,838,390 | 11,830,103 | 353,838,390 |
Machinery and equipment1 [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 245,750,420 | 8,216,330 | 187,012,805 | 175,499,994
Depreciation expense | 35,747,308 | 1,195,162 | 31,751,251 | 22,722,307
Impairment losses recognized | 102,056 | 3,412 | 97,680 | 286,880
Disposals | (18,640,266) | (623,212) | (25,704,778) | (7,540,654)
Reclassification | 83,777 | 2,801 |  | 34,452
Acquisition through business combinations | 4,000,338 | 133,746 | 53,210,063 |
Effect of foreign currency exchange differences | (3,294,855) | (110,159) | (616,601) | (3,990,174)
Ending balance | 263,748,778 | 8,818,080 | 245,750,420 | 187,012,805
Machinery and equipment1 [member] | Accumulated depreciation, amortisation and impairment [member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 245,750,420 |  |  |
Ending balance | 245,750,420 | 8,216,330 | 245,750,420 |
Other equipment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 6,463,160 |  |  |
Ending balance | 6,715,694 | 224,530 | 6,463,160 |
Other equipment [member] | Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 18,380,122 | 614,514 | 7,812,080 | 8,474,661
Additions | 76,671 | 2,564 | 84,860 | 130,659
Disposals | (2,507,440) | (83,833) | (2,251,060) | (763,937)
Reclassification | 3,062,838 | 102,402 | 2,148,211 | 174,947
Acquisition through business combinations | 43,611 | 1,458 | 11,122,171 |
Effect of foreign currency exchange differences | (300,686) | (10,053) | (78,095) | (204,250)
Ending balance | 18,755,116 | 627,052 | 18,380,122 | 7,812,080
Other equipment [member] | Cost [member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 18,838,167 |  |  |
Ending balance | 18,838,167 | 629,828 | 18,838,167 |
Other equipment [member] | Cost [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | (458,045) | (15,314) |  |
Ending balance |  |  | (458,045) |
Other equipment [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 12,194,041 | 407,691 | 6,223,967 | 6,385,080
Depreciation expense | 2,503,967 | 83,717 | 1,816,587 | 746,422
Impairment losses recognized | 20,388 | 682 | 5,860 | 368
Disposals | (2,503,438) | (83,699) | (2,070,302) | (720,319)
Reclassification | (103) | (3) |  | (24,117)
Acquisition through business combinations | 19,028 | 636 | 6,428,174 |
Effect of foreign currency exchange differences | (194,461) | (6,502) | (29,279) | (163,467)
Ending balance | 12,039,422 | 402,522 | 12,194,041 | 6,223,967
Other equipment [member] | Accumulated depreciation, amortisation and impairment [member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 12,375,007 |  |  |
Ending balance | 12,375,007 | 413,741 | 12,375,007 |
Other equipment [member] | Accumulated depreciation, amortisation and impairment [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | (180,966) | (6,050) |  |
Ending balance |  |  | (180,966) |
Construction in progress and machinery in transit [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 10,911,552 |  |  |
Ending balance | 16,637,561 | 556,254 | 10,911,552 |
Construction in progress and machinery in transit [member] | Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 10,911,552 | 364,813 | 5,863,713 | 7,713,542
Additions | 61,777,364 | 2,065,441 | 38,669,807 | 23,094,288
Disposals |  |  | (34,902) | (73,248)
Reclassification | (57,221,627) | (1,913,127) | (39,612,324) | (25,428,464)
Acquisition through business combinations | 250,455 | 8,374 | 5,781,189 |
Effect of foreign currency exchange differences | 919,817 | 30,753 | 244,069 | 557,595
Ending balance | 16,637,561 | 556,254 | 10,911,552 | 5,863,713
Construction in progress and machinery in transit [member] | Cost [member] | Previously stated [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 10,911,552 |  |  |
Ending balance | $ 10,911,552 | $ 364,813 | $ 10,911,552 |
Construction in progress and machinery in transit [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance |  |  |  | 17,288
Disposals |  |  |  | $ (17,288)

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