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Effects on Initial application of IFRS 9 - Additional Information (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($) | Jan. 01, 2019 TWD ($) | Dec. 31, 2018 TWD ($) | Jan. 01, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
--- | --- | --- | --- | --- | --- | --- | ---
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |  |
Contract assets | $ 389,016 |  | $ 377,869 | $ 299,835 |  |  |
Retained earnings | 5,401,569 | $ 192,364 | 4,651,215 |  |  |  |
Deferred tax assets | $ 185,691 | $ 6,613 | $ 194,552 |  | $ 226,716 |  | $ 212,372
Increase (decrease) due to changes in accounting policy required by IFRSs [member] |  |  |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |  |  |
Contract assets |  |  |  |  |  | $ (115) |
Accounts receivable |  |  |  |  |  | (1,819) |
Other receivables |  |  |  |  |  | (5) |
Other receivables-related parties |  |  |  |  |  | (2) |
Retained earnings |  |  |  |  |  | (1,940) |
Deferred tax assets |  |  |  |  |  | $ 1 |

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