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Lease Arrangements - Maturity Analysis of Lease Payments Receivable Under Operating Subleases (Detail) - Operating Sublease Agreement [Member] - TWD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Maturity Analysis Of Operating Lease Receivables Under Subleases [Line Items]
Maturity analysis of lease payments receivable	$ 144.1	$ 60.5
Year 1 [Member]
Disclosure Of Maturity Analysis Of Operating Lease Receivables Under Subleases [Line Items]
Maturity analysis of lease payments receivable	$ 144.1	58.6
Year 2 [Member]
Disclosure Of Maturity Analysis Of Operating Lease Receivables Under Subleases [Line Items]
Maturity analysis of lease payments receivable		$ 1.9

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- Definition

The amount of undiscounted operating lease payments to be received. Operating lease is a lease that does not transfer substantially all the risks and rewards incidental to ownership of an underlying asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2020-01-01
-Paragraph 97
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_97&doctype=Standard
-URIDate 2020-01-01

+ Details

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X

- Definition

Disclosure Of Maturity Analysis Of Operating Lease Receivables Under Subleases.

+ References

No definition available.

+ Details

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- Details

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X

- Details

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X

- Details

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