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v3.19.1

Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($)
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance |  | $ 135,168,406 |  |
Depreciation expense | $ 1,303,293 | 39,893,786 | $ 28,625,287 | $ 28,961,614
Additions | 1,277,107 | 39,092,238 | 23,677,682 | 27,680,862
Ending balance | 7,010,539 | 214,592,588 | 135,168,406 |
Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 12,098,015 | 370,320,242 | 364,012,147 | 355,233,007
Additions | 1,277,106 | 39,092,238 | 23,677,682 | 27,680,862
Disposals | (962,315) | (29,456,450) | (9,896,428) | (7,069,481)
Reclassification | (486) | (14,891) | (474,352) | (175)
Acquisition through business combinations | 5,119,954 | 156,721,779 |  | 1,159
Effect of foreign currency exchange differences | (39,230) | (1,200,829) | (6,998,807) | (11,833,225)
Ending balance | 17,493,044 | 535,462,089 | 370,320,242 | 364,012,147
Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 7,682,190 | 235,151,836 | 220,131,906 | 205,235,932
Depreciation expense | 1,303,292 | 39,893,786 | 28,625,287 | 28,961,614
Impairment losses recognized | 4,348 | 133,071 | 289,558 | 888,231
Disposals | (923,428) | (28,266,113) | (8,757,164) | (6,245,611)
Reclassification | (9) | (265) | (199,745) |
Acquisition through business combinations | 2,441,561 | 74,736,157 |  | 824
Effect of foreign currency exchange differences | (25,449) | (778,971) | (4,938,006) | (8,709,084)
Ending balance | 10,482,505 | 320,869,501 | 235,151,836 | 220,131,906
Land [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance |  | 3,258,518 |  |
Ending balance | 332,113 | 10,165,969 | 3,258,518 |
Land [member] | Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 106,453 | 3,258,518 | 3,365,013 | 3,381,300
Reclassification |  |  | (35,965) |
Acquisition through business combinations | 224,776 | 6,880,400 |  |
Effect of foreign currency exchange differences | 884 | 27,051 | (70,530) | (16,287)
Ending balance | 332,113 | 10,165,969 | 3,258,518 | 3,365,013
Buildings and improvements [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance |  | 58,272,864 |  |
Ending balance | 2,579,678 | 78,963,937 | 58,272,864 |
Buildings and improvements [member] | Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 3,273,046 | 100,187,928 | 96,258,175 | 94,447,932
Additions | 4,734 | 144,898 | 350,434 | 22,341
Disposals | (22,124) | (677,206) | (609,294) | (684,698)
Reclassification | 176,044 | 5,388,709 | 6,483,392 | 5,110,102
Acquisition through business combinations | 1,212,936 | 37,127,957 |  |
Effect of foreign currency exchange differences | (15,168) | (464,275) | (2,294,779) | (2,637,502)
Ending balance | 4,629,468 | 141,708,011 | 100,187,928 | 96,258,175
Buildings and improvements [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 1,369,326 | 41,915,064 | 38,229,544 | 34,646,878
Depreciation expense | 206,663 | 6,325,948 | 5,156,558 | 5,114,263
Impairment losses recognized | 965 | 29,531 | 2,310 | 620
Disposals | (16,042) | (491,033) | (478,903) | (449,198)
Reclassification | (9) | (265) | (210,080) | (5,123)
Acquisition through business combinations | 493,235 | 15,097,920 |  |
Effect of foreign currency exchange differences | (4,348) | (133,091) | (784,365) | (1,077,896)
Ending balance | 2,049,790 | 62,744,074 | 41,915,064 | 38,229,544
Machinery and equipment1 [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance |  | 66,185,198 |  |
Ending balance | 3,531,133 | 108,087,970 | 66,185,198 |
Machinery and equipment1 [member] | Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 8,271,741 | 253,198,003 | 248,200,756 | 243,283,607
Additions | 6,294 | 192,673 | 102,301 | 94,480
Disposals | (865,511) | (26,493,282) | (8,449,949) | (5,956,179)
Reclassification | 1,047,387 | 32,060,513 | 18,331,738 | 19,661,732
Acquisition through business combinations | 3,130,025 | 95,810,062 |  |
Effect of foreign currency exchange differences | (30,368) | (929,579) | (4,986,843) | (8,882,884)
Ending balance | 11,559,568 | 353,838,390 | 253,198,003 | 248,200,756
Machinery and equipment1 [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 6,109,533 | 187,012,805 | 175,499,994 | 164,568,298
Depreciation expense | 1,037,283 | 31,751,251 | 22,722,307 | 22,983,290
Impairment losses recognized | 3,191 | 97,680 | 286,880 | 876,123
Disposals | (839,751) | (25,704,778) | (7,540,654) | (5,544,489)
Reclassification |  |  | 34,452 | 9,660
Acquisition through business combinations | 1,738,323 | 53,210,063 |  |
Effect of foreign currency exchange differences | (20,144) | (616,601) | (3,990,174) | (7,392,888)
Ending balance | 8,028,435 | 245,750,420 | 187,012,805 | 175,499,994
Other equipment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance |  | 1,588,113 |  |
Ending balance | 211,145 | 6,463,160 | 1,588,113 |
Other equipment [member] | Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 255,213 | 7,812,080 | 8,474,661 | 7,722,408
Additions | 2,772 | 84,860 | 130,659 | 470,901
Disposals | (73,540) | (2,251,060) | (763,937) | (159,822)
Reclassification | 70,180 | 2,148,211 | 174,947 | 691,276
Acquisition through business combinations | 363,351 | 11,122,171 |  | 1,159
Effect of foreign currency exchange differences | (2,551) | (78,095) | (204,250) | (251,261)
Ending balance | 615,425 | 18,838,167 | 7,812,080 | 8,474,661
Other equipment [member] | Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 203,331 | 6,223,967 | 6,385,080 | 5,907,414
Depreciation expense | 59,346 | 1,816,587 | 746,422 | 864,061
Impairment losses recognized | 192 | 5,860 | 368 | 5,564
Disposals | (67,635) | (2,070,302) | (720,319) | (151,875)
Reclassification |  |  | (24,117) | (4,537)
Acquisition through business combinations | 210,003 | 6,428,174 |  | 824
Effect of foreign currency exchange differences | (957) | (29,279) | (163,467) | (236,371)
Ending balance | 404,280 | 12,375,007 | 6,223,967 | 6,385,080
Construction in progress and machinery in transit [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance |  | 5,863,713 |  |
Ending balance | 356,470 | 10,911,552 | 5,863,713 |
Construction in progress and machinery in transit [member] | Cost [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |
Beginning balance | 191,562 | 5,863,713 | 7,713,542 | 6,397,760
Additions | 1,263,306 | 38,669,807 | 23,094,288 | 27,093,140
Disposals | (1,140) | (34,902) | (73,248) | (268,782)
Reclassification | (1,294,097) | (39,612,324) | (25,428,464) | (25,463,285)
Acquisition through business combinations | 188,866 | 5,781,189 |  |
Effect of foreign currency exchange differences | 7,973 | 244,069 | 557,595 | (45,291)
Ending balance | $ 356,470 | $ 10,911,552 | 5,863,713 | 7,713,542
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 | 113,342
Impairment losses recognized |  |  |  | 5,924
Disposals |  |  | $ (17,288) | (100,049)
Effect of foreign currency exchange differences |  |  |  | (1,929)
Ending balance |  |  |  | $ 17,288

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