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Short-term Bank Loans - Summary of Short-term Bank Loans (Detail) - Short-term borrowings [member] $ in Thousands, $ in Thousands	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 USD ($)
Disclosure of detailed information about borrowings [Line Items]
Unsecured bank loans	$ 731,751
Undrawn borrowing facilities	$ 2,918,249	$ 85,025	$ 3,251,000	$ 90,000
Bottom of range [member]
Disclosure of detailed information about borrowings [Line Items]
Interest rate range	0.6604%	0.6604%
Top of range [member]
Disclosure of detailed information about borrowings [Line Items]
Interest rate range	0.7394%	0.7394%

X

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2021-01-01
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-URIDate 2021-03-24

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- Definition

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

+ References

No definition available.

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- Definition

The amount of undrawn borrowing facilities that may be available for future operating activities and to settle capital commitments. [Refer: Capital commitments]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2021-01-01
-Paragraph 50
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-URIDate 2021-03-24

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X

- Definition

The amount of loans received from banks that have not been secured by collateral. [Refer: Loans received]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2021-01-01
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-URIDate 2021-03-24

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- Details

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