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Financial Risk and Fair Value Disclosures - Assets and Liabilities Not Recorded at Fair Value on a Recurring Basis But for Which Fair Value is Disclosed (Detail) - TWD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Disclosure of fair value measurement of liabilities [line items]
Bonds payables (current portion included)	$ 30,051,568	$ 38,359,352
Long-term loans (current portion included)	36,476,909	22,883,344
Not measured at fair value in statement of financial position but for which fair value is disclosed [member]
Disclosure of fair value measurement of liabilities [line items]
Bonds payables (current portion included)	30,020,005	38,367,168
Long-term loans (current portion included)	36,476,909	22,883,344
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Level 1 [member]
Disclosure of fair value measurement of liabilities [line items]
Bonds payables (current portion included)	24,409,952	32,827,211
Long-term loans (current portion included)	0	0
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Level 2 [member]
Disclosure of fair value measurement of liabilities [line items]
Bonds payables (current portion included)	5,610,053	5,539,957
Long-term loans (current portion included)	36,476,909	22,883,344
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Level 3 [member]
Disclosure of fair value measurement of liabilities [line items]
Bonds payables (current portion included)	0	0
Long-term loans (current portion included)	$ 0	$ 0

X

- Definition

The amount of bonds issued by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 112
-Subparagraph c
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-URIDate 2024-03-27

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- Definition

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+ References

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- Definition

The amount of loans received.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2024-01-01
-Paragraph 112
-Subparagraph c
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-URIDate 2024-03-27

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