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Effects on Initial Application of IFRS 15 and Information for the Year Ended December 31, 2017 in Conformity With IAS 18 - Impact and Description on Consolidated Statement of Financial Position and Statement of Comprehensive Income (Detail) $ / shares in Units, $ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) $ / shares | Dec. 31, 2017 TWD ($) | Dec. 31, 2019 USD ($) | Jan. 01, 2018 TWD ($)
Disclosure of financial assets [Line Items] |  |  |  |  |  |
Contract assets | $ 377,869 |  | $ 299,835 |  |  | $ 254,997
Inventories | 1,767,642 |  | 1,778,835 |  | $ 59,099 |
Deferred tax assets | 194,552 |  | 226,716 | $ 212,372 | 6,505 |
Contract liabilities | 1,231 |  | 1,432 |  |  | $ 1,152
Receipts in advance | 988 |  | 1,013 |  | 33 |
Current provisions | 1,998 |  | 29,352 |  | 67 |
Retained earnings | 4,651,215 |  | 3,602,663 |  | $ 155,507 |
Revenue | 20,337,881 | $ 679,969 | 18,480,027 | 17,940,855 |  |
Cost of revenue | (16,411,742) | (548,704) | (15,050,032) | (14,703,729) |  |
Operating expenses | 92,928 | 3,107 | 147,514 | 692,834 |  |
Other non-operating income (expenses), net | (73,287) | (2,450) | 173,070 | (327,620) |  |
Income tax expense | 513,679 | 17,174 | 456,618 | 550,487 |  |
Profit for the year | $ 2,508,574 | $ 83,871 | 1,325,824 | $ 2,796,882 |  |
IFRS 15 [member] |  |  |  |  |  |
Disclosure of financial assets [Line Items] |  |  |  |  |  |
Contract assets |  |  | 299,835 |  |  |
Inventories |  |  | 1,778,835 |  |  |
Deferred tax assets |  |  | 226,716 |  |  |
Contract liabilities |  |  | 1,432 |  |  |
Receipts in advance |  |  | 1,013 |  |  |
Current provisions |  |  | 29,352 |  |  |
Current refund liabilities |  |  | 32,627 |  |  |
Retained earnings |  |  | 3,602,663 |  |  |
Revenue |  |  | 18,480,027 |  |  |
Cost of revenue |  |  | (15,050,032) |  |  |
Operating expenses |  |  | (1,477,788) |  |  |
Other non-operating income (expenses), net |  |  | 173,070 |  |  |
Income tax expense |  |  | (456,618) |  |  |
Profit for the year |  |  | $ 1,325,824 |  |  |
Earnings per share (in dollars) |  |  |  |  |  |
Basic | $ / shares |  |  | $ 1.65 |  |  |
Diluted | $ / shares |  |  | $ 1.63 |  |  |
Previously stated [member] |  |  |  |  |  |
Disclosure of financial assets [Line Items] |  |  |  |  |  |
Inventories |  |  | $ 2,016,106 |  |  |
Deferred tax assets |  |  | 226,635 |  |  |
Receipts in advance |  |  | 2,445 |  |  |
Current provisions |  |  | 61,979 |  |  |
Retained earnings |  |  | 3,540,018 |  |  |
Revenue |  |  | 18,434,763 |  |  |
Cost of revenue |  |  | (15,021,266) |  |  |
Operating expenses |  |  | (1,477,653) |  |  |
Other non-operating income (expenses), net |  |  | 173,476 |  |  |
Income tax expense |  |  | (465,392) |  |  |
Profit for the year |  |  | $ 1,301,093 |  |  |
Earnings per share (in dollars) |  |  |  |  |  |
Basic | $ / shares |  |  | $ 1.62 |  |  |
Diluted | $ / shares |  |  | $ 1.60 |  |  |
Increase (decrease) due to changes in accounting policy [member] |  |  |  |  |  |
Disclosure of financial assets [Line Items] |  |  |  |  |  |
Contract assets |  |  | $ 299,835 |  |  |
Inventories |  |  | (237,271) |  |  |
Deferred tax assets |  |  | 81 |  |  |
Contract liabilities |  |  | 1,432 |  |  |
Receipts in advance |  |  | (1,432) |  |  |
Current provisions |  |  | (32,627) |  |  |
Current refund liabilities |  |  | 32,627 |  |  |
Retained earnings |  |  | 62,645 |  |  |
Revenue |  |  | 45,264 |  |  |
Cost of revenue |  |  | (28,766) |  |  |
Operating expenses |  |  | (135) |  |  |
Other non-operating income (expenses), net |  |  | (406) |  |  |
Income tax expense |  |  | 8,774 |  |  |
Profit for the year |  |  | $ 24,731 |  |  |
Earnings per share (in dollars) |  |  |  |  |  |
Basic | $ / shares |  |  | $ 0.03 |  |  |
Diluted | $ / shares |  |  | $ 0.03 |  |  |

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