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Inventories - Summary of Write downs reversals of Inventories (Detail) - TWD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Write-downs (reversals of write-downs) of inventories [abstract]
Write downs Reversals of Inventories	$ (946.0)	$ 273.7

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- Definition

The amount recognised resulting from the write-down of inventories to net realisable value or reversals of those write-downs. [Refer: Inventories]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 98
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_98_a&doctype=Standard
-URIDate 2020-01-01

+ Details

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

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- References

No definition available.

+ Details

Name:	ifrs-full_WritedownsReversalsOfWritedownsOfInventoriesAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration