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Long-Term Bank Loans - Summary of Loans and Bonds Payable (Detail) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 USD ($)
Disclosure of detailed information about borrowings [line items]
Long-term bank loans	$ 1,967.6	$ 70.1
Long-term bank loans [member]
Disclosure of detailed information about borrowings [line items]
Unsecured loans	2,000.0
Less: Discounts on government grants	(32.4)
Long-term bank loans	$ 1,967.6
Annual interest rate	0.40%	0.40%
Maturity date	September 2025

X

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

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-IssueDate 2020-01-01
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X

- Definition

The maturity of borrowings. [Refer: Borrowings]

+ References

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-IssueDate 2020-01-01
-Paragraph 7
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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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- Definition

The non-current portion of non-current borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2020-01-01
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- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

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-IssueDate 2020-01-01
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- Definition

Discounts on government grants.

+ References

No definition available.

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