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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 TWD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 TWD ($)	Dec. 31, 2017 TWD ($)
Cash and cash equivalents [abstract]
Cash on hand	$ 6,073	$ 216	$ 6,567
Checking accounts and demand deposits	48,734,866	1,735,572	44,565,936
Cash equivalents Cash equivalents (time deposits with original maturity of less than three months)	2,797,132	99,613	15,558,372
Cash and cash equivalents,total	$ 51,538,071	$ 1,835,401	$ 60,130,875	$ 2,141,413	$ 51,518,436	$ 46,078,066

X

- Definition

The amount of cash balances held at banks.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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X

- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

+ References

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- Definition

The amount of short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value.

+ References

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- Definition

The amount of cash held by the entity. This does not include demand deposits.

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