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v3.19.1

Significant Subsequent Events - Additional Information (Detail) $ / shares in Units, $ / shares in Units, $ in Thousands, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Mar. 28, 2019 USD ($) $ / shares | Mar. 28, 2019 TWD ($) $ / shares | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($)
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |
Proceeds from issue of ordinary shares |  |  | $ 10,290,000 |
Proceeds from issue of bonds |  |  | $ 8,000,000 | $ 9,000,000
Ordinary shares [member] |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |
Par value of ordinary shares | (per share) | $ 0.3 | $ 10.0 |  |
Ordinary shares [member] | Top of range [member] |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |
Proceeds from issue of ordinary shares | $ 98,007 | $ 3,000,000 |  |
Unsecured domestic bonds [member] |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |
Maturity term | Five and seven year | Five and seven year |  |
Unsecured domestic bonds [member] | Unsecured domestic bond annual interest rates of 0.9% with maturity of 5 years [member] |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |
Proceeds from issue of bonds | $ 212,349 | $ 6,500,000 |  |
Interest rate | 0.90% | 0.90% |  |
Maturity term | 5 years | 5 years |  |
Unsecured domestic bonds [member] | Unsecured domestic bond annual interest rates of 1.03% with maturity of 7 years [member] |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |
Proceeds from issue of bonds | $ 114,342 | $ 3,500,000 |  |
Interest rate | 1.03% | 1.03% |  |
Maturity term | 7 years | 7 years |  |

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- Definition The description of terms of shares reserved for issue under options and contracts for the sale of shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 79 -Subparagraph a -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_79_a_vii&doctype=Standard -URIDate 2018-03-16 + Details
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