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Equity - Schedule of appropriation of retained earnings (Detail) - TWD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Appropriation of earnings	$ 37,582,768	$ 19,510,000
Dividends per share	$ 7	$ 4.2
Legal reserve [member]
Appropriation of earnings	$ 6,282,762	$ 2,398,814
Special reserve [member]
Appropriation of earnings	798,025	(1,278,670)
Cash dividends [member]
Appropriation of earnings	$ 30,501,981	$ 18,389,856

X

- Definition

The amount of dividends paid per ordinary share.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 34
-IssueDate 2022-03-24
-Paragraph 16A
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-URIDate 2022-03-24

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X

- Definition

The increase (decrease) in equity resulting from the appropriation of retained earnings. [Refer: Retained earnings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 1
-IssueDate 2022-03-24
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_106_d&doctype=Standard
-URIDate 2022-03-24

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