The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims.

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+ Details

Operating Segment Information - Individual Customers Accounting for at least 10% of Operating Revenues (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024 TWD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 TWD ($)	Dec. 31, 2022 TWD ($)
Disclosure of Major Customers [Line Items]
Operating revenues	$ 232,302,584	$ 7,084,556	$ 222,533,000	$ 278,705,264
Customer concentration risk [member] \| Wafer fabrication [member] \| Customer A [member]
Disclosure of Major Customers [Line Items]
Operating revenues	$ 24,180,535
Customer concentration risk [member] \| Wafer fabrication [member] \| Customer B [member]
Disclosure of Major Customers [Line Items]
Operating revenues			$ 29,242,973