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Business Combinations - Summary of Net Cash Outflow on Acquisition of Subsidiaries (Detail) - TWD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about business combination [Line Items]
Less: Cash acquired		$ (29,133)
Net cash outflow on acquisition of subsidiaries		$ (7,046,464)
TLJ Intertech Inc. [member]
Disclosure of detailed information about business combination [Line Items]
Consideration paid in cash	$ 89,998
Less: Cash acquired	(16,561)
Net cash outflow on acquisition of subsidiaries	$ 73,437

X

- 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
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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
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-IssueDate 2018-01-01
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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

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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