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

X

- 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 2019-01-01
-Paragraph 97
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_97&doctype=Standard
-URIDate 2019-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Disclosure Of Maturity Analysis Of Operating Lease Receivables Under Subleases.

+ References

No definition available.

+ Details

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X

- Details

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Namespace Prefix:
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X

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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