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Profit Before Income Tax - Summary of Operating Expenses Directly Related to Investment Properties (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 TWD ($)	Dec. 31, 2018 TWD ($)
Direct operating expense from investment property [abstract]
Direct operating expenses of investment properties that generated rental income	$ 1,121,854	$ 39,952	$ 1,232,826	$ 1,276,751

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- References

No definition available.

+ Details

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- Definition

The amount of direct operating expenses (including repairs and maintenance) arising from investment property that generated rental income during the period recognised in profit or loss. [Refer: Investment property]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 40
-IssueDate 2020-01-01
-Paragraph 75
-Subparagraph f
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=40&code=ifrs-tx-2020-en-r&anchor=para_75_f_ii&doctype=Standard
-URIDate 2020-01-01

+ Details

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