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Business Combinations - Summary of Net Cash Outflow on Acquisition of Subsidiary SPIL (Detail) $ in Thousands, $ in Thousands | 12 Months Ended |
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Dec. 31, 2018 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2018 TWD ($)
Disclosure of detailed information about business combination [Line Items] |  |  |  |
Less: Cash and cash equivalent acquired |  |  | $ 29,133 |
Net cash outflow on acquisition of subsidiaries |  |  | $ (7,046,464) |
Siliconware Precision Industries Co., Ltd. [member] |  |  |  |
Disclosure of detailed information about business combination [Line Items] |  |  |  |
Total consideration | $ 5,502,796 |  |  | $ 168,440,585
Less: Payable for consideration representing the ordinary shares originally held by ASE | (1,735,046) | $ (53,109,760) |  |
Less: Cash and cash equivalent acquired | (656,288) | (20,088,970) |  |
Net cash outflow on acquisition of subsidiaries | $ 3,111,462 | $ 95,241,855 |  |

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- Definition The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_f&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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- Definition The amount of cash and cash equivalents in subsidiaries or other businesses over which control is obtained or lost. [Refer: Subsidiaries [member]; Cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 40 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_40_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of consideration paid or received in respect of both obtaining and losing control of subsidiaries or other businesses. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 40 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_40_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of liabilities in subsidiaries or other businesses over which control is obtained or lost. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 40 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_40_d&doctype=Standard -URIDate 2018-03-16 + Details
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